8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 116

SAFETY OF CAR AND

PHYSICS(HOW THINGS WORK)

Seung-Jae YouSunghun Jun

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 216

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 316

Automobiles Tires amp

Friction

The friction between the tires of anautomobile and the road determine themaximum accelerationHowever more importantly it determinesthe minimum stopping distance The nature of the friction could actually be amatter of life and deathAs a result more friction more safe

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 416

Automobiles Tires amp

FrictionHow can we increase the friction

- Increase the coefficient of friction

- If the surface of tire is rougher then the frictionforce is larger- When a tire contacts dry asphalt ground the

coefficient of friction increases- On the other hand if the roads are wet a tire

contacts with water the coefficient of frictiondecreases

- ex) hydroplaning

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 516

Automobiles Tires amp

Friction

Various types of tires This is an all-season tire The grooves provide a way for waterto escape increasing the coefficient of friction The groovesare small enough to prevent the bumpy ride of the next tire

The wide deep grooves here allow snow and mud topenetrate But they give a noisy bumpy ride on pavement and if the treads get clogged with mud the treaded tireessentially becomes a mud-covered slick with a lowcoefficient of friction

In extreme mud these tractor or bush tires can transfer moreforce but the mud doesnt get caught in tiny grooves so theyretain their traction

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 616

Automobiles Tires amp

Friction

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 716

Seatbelt and Inertia

Newtonrsquos 1 st law an object will move withconstant speed in a straight line except whenacted upon by a net force when a driver stops the car suddenly thedriver fall forwards because the driverrsquos bodytry to maintain its speedConsequently a seatbelt holds the driver andprevents the driver from falling forwardswhen the car stops

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 816

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 916

Airbag and Momentum amp

ImpulseEvery object has momentumMomentum consists of a driverrsquos mass and velocity - Momentum ( p ) and Impulse ( FDt )

- p = mv FΔt = mΔv There has to be a force in order to stop the driverrsquosmomentumThe driver may hits the dashboard or windshield which also acts as a force stopping the driver but it injures them at the same timeBy the way Airbag gives a force over time (Impulse) The more the the force acts on the driver to slowhim down the less damage caused to the driver

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1016

Crumple Zone

It is also known as crashzoneIt absorbs energy from a

collision and reduce theforce of a collisionBending during a car crashincreases time to halt the

carNewtonrsquos first and secondlaws are applied tocrumple zone

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1116

Newtonrsquos First Law

Newtonrsquos First Law (The law of inertia) Many people are injured because of the lawof inertiaAlthough the car stops the person insidedoes not stopAn unbalance force crumple zone lowers the

tendency of people to move forward in carcrash

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1216

Crumple Zone

Newtonrsquos Second Law The second law is expressed in equation formas F=MA (F= force M= mass A=acceleration)A=VT (V= velocity T= time)More time means less accelerationLess acceleration by increased time reducesforce that applies to people inside of the car

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1316

What new insight does this

topic provide to youMany people think tirersquos surface guaranteeyour safety 100 but tirersquos surface justmakes you safe on the snow water or anyother groundSince car body seems easily bend Somepeople think that crumple zone makes the carless protectedHowever It is just misconception In factcrumple zone makes car more safe

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1416

What new insight does this

topic provide to youA misconception of AWD and 4WD is thatthey are saferIn fact they help little bit in cornering anddriving on snowHowever it has nothing to do with brakingability

AWD and 4WD do not provide additionalability for steeringAWD and 4WD do not provide additionalability for braking

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1516

What new insight does this

topic provide to youEven if the carrsquos safety improve this is whathappen if you drive too fast

httpsoccerlinecokrslboardviewphpuid=1992352704amppage=1ampcode=streamingboardampkeyfield=subjectampkey=C2F7ampperiod=0|1992454226

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 216

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 316

Automobiles Tires amp

Friction

The friction between the tires of anautomobile and the road determine themaximum accelerationHowever more importantly it determinesthe minimum stopping distance The nature of the friction could actually be amatter of life and deathAs a result more friction more safe

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 416

Automobiles Tires amp

FrictionHow can we increase the friction

- Increase the coefficient of friction

- If the surface of tire is rougher then the frictionforce is larger- When a tire contacts dry asphalt ground the

coefficient of friction increases- On the other hand if the roads are wet a tire

contacts with water the coefficient of frictiondecreases

- ex) hydroplaning

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 516

Automobiles Tires amp

Friction

Various types of tires This is an all-season tire The grooves provide a way for waterto escape increasing the coefficient of friction The groovesare small enough to prevent the bumpy ride of the next tire

The wide deep grooves here allow snow and mud topenetrate But they give a noisy bumpy ride on pavement and if the treads get clogged with mud the treaded tireessentially becomes a mud-covered slick with a lowcoefficient of friction

In extreme mud these tractor or bush tires can transfer moreforce but the mud doesnt get caught in tiny grooves so theyretain their traction

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 616

Automobiles Tires amp

Friction

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 716

Seatbelt and Inertia

Newtonrsquos 1 st law an object will move withconstant speed in a straight line except whenacted upon by a net force when a driver stops the car suddenly thedriver fall forwards because the driverrsquos bodytry to maintain its speedConsequently a seatbelt holds the driver andprevents the driver from falling forwardswhen the car stops

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 816

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 916

Airbag and Momentum amp

ImpulseEvery object has momentumMomentum consists of a driverrsquos mass and velocity - Momentum ( p ) and Impulse ( FDt )

- p = mv FΔt = mΔv There has to be a force in order to stop the driverrsquosmomentumThe driver may hits the dashboard or windshield which also acts as a force stopping the driver but it injures them at the same timeBy the way Airbag gives a force over time (Impulse) The more the the force acts on the driver to slowhim down the less damage caused to the driver

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1016

Crumple Zone

It is also known as crashzoneIt absorbs energy from a

collision and reduce theforce of a collisionBending during a car crashincreases time to halt the

carNewtonrsquos first and secondlaws are applied tocrumple zone

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1116

Newtonrsquos First Law

Newtonrsquos First Law (The law of inertia) Many people are injured because of the lawof inertiaAlthough the car stops the person insidedoes not stopAn unbalance force crumple zone lowers the

tendency of people to move forward in carcrash

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1216

Crumple Zone

Newtonrsquos Second Law The second law is expressed in equation formas F=MA (F= force M= mass A=acceleration)A=VT (V= velocity T= time)More time means less accelerationLess acceleration by increased time reducesforce that applies to people inside of the car

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1316

What new insight does this

topic provide to youMany people think tirersquos surface guaranteeyour safety 100 but tirersquos surface justmakes you safe on the snow water or anyother groundSince car body seems easily bend Somepeople think that crumple zone makes the carless protectedHowever It is just misconception In factcrumple zone makes car more safe

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1416

What new insight does this

topic provide to youA misconception of AWD and 4WD is thatthey are saferIn fact they help little bit in cornering anddriving on snowHowever it has nothing to do with brakingability

AWD and 4WD do not provide additionalability for steeringAWD and 4WD do not provide additionalability for braking

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1516

What new insight does this

topic provide to youEven if the carrsquos safety improve this is whathappen if you drive too fast

httpsoccerlinecokrslboardviewphpuid=1992352704amppage=1ampcode=streamingboardampkeyfield=subjectampkey=C2F7ampperiod=0|1992454226

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 316

Automobiles Tires amp

Friction

The friction between the tires of anautomobile and the road determine themaximum accelerationHowever more importantly it determinesthe minimum stopping distance The nature of the friction could actually be amatter of life and deathAs a result more friction more safe

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 416

Automobiles Tires amp

FrictionHow can we increase the friction

- Increase the coefficient of friction

- If the surface of tire is rougher then the frictionforce is larger- When a tire contacts dry asphalt ground the

coefficient of friction increases- On the other hand if the roads are wet a tire

contacts with water the coefficient of frictiondecreases

- ex) hydroplaning

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 516

Automobiles Tires amp

Friction

Various types of tires This is an all-season tire The grooves provide a way for waterto escape increasing the coefficient of friction The groovesare small enough to prevent the bumpy ride of the next tire

The wide deep grooves here allow snow and mud topenetrate But they give a noisy bumpy ride on pavement and if the treads get clogged with mud the treaded tireessentially becomes a mud-covered slick with a lowcoefficient of friction

In extreme mud these tractor or bush tires can transfer moreforce but the mud doesnt get caught in tiny grooves so theyretain their traction

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 616

Automobiles Tires amp

Friction

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 716

Seatbelt and Inertia

Newtonrsquos 1 st law an object will move withconstant speed in a straight line except whenacted upon by a net force when a driver stops the car suddenly thedriver fall forwards because the driverrsquos bodytry to maintain its speedConsequently a seatbelt holds the driver andprevents the driver from falling forwardswhen the car stops

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 816

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 916

Airbag and Momentum amp

ImpulseEvery object has momentumMomentum consists of a driverrsquos mass and velocity - Momentum ( p ) and Impulse ( FDt )

- p = mv FΔt = mΔv There has to be a force in order to stop the driverrsquosmomentumThe driver may hits the dashboard or windshield which also acts as a force stopping the driver but it injures them at the same timeBy the way Airbag gives a force over time (Impulse) The more the the force acts on the driver to slowhim down the less damage caused to the driver

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1016

Crumple Zone

It is also known as crashzoneIt absorbs energy from a

collision and reduce theforce of a collisionBending during a car crashincreases time to halt the

carNewtonrsquos first and secondlaws are applied tocrumple zone

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1116

Newtonrsquos First Law

Newtonrsquos First Law (The law of inertia) Many people are injured because of the lawof inertiaAlthough the car stops the person insidedoes not stopAn unbalance force crumple zone lowers the

tendency of people to move forward in carcrash

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1216

Crumple Zone

Newtonrsquos Second Law The second law is expressed in equation formas F=MA (F= force M= mass A=acceleration)A=VT (V= velocity T= time)More time means less accelerationLess acceleration by increased time reducesforce that applies to people inside of the car

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1316

What new insight does this

topic provide to youMany people think tirersquos surface guaranteeyour safety 100 but tirersquos surface justmakes you safe on the snow water or anyother groundSince car body seems easily bend Somepeople think that crumple zone makes the carless protectedHowever It is just misconception In factcrumple zone makes car more safe

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1416

What new insight does this

topic provide to youA misconception of AWD and 4WD is thatthey are saferIn fact they help little bit in cornering anddriving on snowHowever it has nothing to do with brakingability

AWD and 4WD do not provide additionalability for steeringAWD and 4WD do not provide additionalability for braking

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1516

What new insight does this

topic provide to youEven if the carrsquos safety improve this is whathappen if you drive too fast

httpsoccerlinecokrslboardviewphpuid=1992352704amppage=1ampcode=streamingboardampkeyfield=subjectampkey=C2F7ampperiod=0|1992454226

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 416

Automobiles Tires amp

FrictionHow can we increase the friction

- Increase the coefficient of friction

- If the surface of tire is rougher then the frictionforce is larger- When a tire contacts dry asphalt ground the

coefficient of friction increases- On the other hand if the roads are wet a tire

contacts with water the coefficient of frictiondecreases

- ex) hydroplaning

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 516

Automobiles Tires amp

Friction

Various types of tires This is an all-season tire The grooves provide a way for waterto escape increasing the coefficient of friction The groovesare small enough to prevent the bumpy ride of the next tire

The wide deep grooves here allow snow and mud topenetrate But they give a noisy bumpy ride on pavement and if the treads get clogged with mud the treaded tireessentially becomes a mud-covered slick with a lowcoefficient of friction

In extreme mud these tractor or bush tires can transfer moreforce but the mud doesnt get caught in tiny grooves so theyretain their traction

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 616

Automobiles Tires amp

Friction

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 716

Seatbelt and Inertia

Newtonrsquos 1 st law an object will move withconstant speed in a straight line except whenacted upon by a net force when a driver stops the car suddenly thedriver fall forwards because the driverrsquos bodytry to maintain its speedConsequently a seatbelt holds the driver andprevents the driver from falling forwardswhen the car stops

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 816

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 916

Airbag and Momentum amp

ImpulseEvery object has momentumMomentum consists of a driverrsquos mass and velocity - Momentum ( p ) and Impulse ( FDt )

- p = mv FΔt = mΔv There has to be a force in order to stop the driverrsquosmomentumThe driver may hits the dashboard or windshield which also acts as a force stopping the driver but it injures them at the same timeBy the way Airbag gives a force over time (Impulse) The more the the force acts on the driver to slowhim down the less damage caused to the driver

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1016

Crumple Zone

It is also known as crashzoneIt absorbs energy from a

collision and reduce theforce of a collisionBending during a car crashincreases time to halt the

carNewtonrsquos first and secondlaws are applied tocrumple zone

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1116

Newtonrsquos First Law

Newtonrsquos First Law (The law of inertia) Many people are injured because of the lawof inertiaAlthough the car stops the person insidedoes not stopAn unbalance force crumple zone lowers the

tendency of people to move forward in carcrash

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1216

Crumple Zone

Newtonrsquos Second Law The second law is expressed in equation formas F=MA (F= force M= mass A=acceleration)A=VT (V= velocity T= time)More time means less accelerationLess acceleration by increased time reducesforce that applies to people inside of the car

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1316

What new insight does this

topic provide to youMany people think tirersquos surface guaranteeyour safety 100 but tirersquos surface justmakes you safe on the snow water or anyother groundSince car body seems easily bend Somepeople think that crumple zone makes the carless protectedHowever It is just misconception In factcrumple zone makes car more safe

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1416

What new insight does this

topic provide to youA misconception of AWD and 4WD is thatthey are saferIn fact they help little bit in cornering anddriving on snowHowever it has nothing to do with brakingability

AWD and 4WD do not provide additionalability for steeringAWD and 4WD do not provide additionalability for braking

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1516

What new insight does this

topic provide to youEven if the carrsquos safety improve this is whathappen if you drive too fast

httpsoccerlinecokrslboardviewphpuid=1992352704amppage=1ampcode=streamingboardampkeyfield=subjectampkey=C2F7ampperiod=0|1992454226

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 516

Automobiles Tires amp

Friction

Various types of tires This is an all-season tire The grooves provide a way for waterto escape increasing the coefficient of friction The groovesare small enough to prevent the bumpy ride of the next tire

The wide deep grooves here allow snow and mud topenetrate But they give a noisy bumpy ride on pavement and if the treads get clogged with mud the treaded tireessentially becomes a mud-covered slick with a lowcoefficient of friction

In extreme mud these tractor or bush tires can transfer moreforce but the mud doesnt get caught in tiny grooves so theyretain their traction

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 616

Automobiles Tires amp

Friction

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 716

Seatbelt and Inertia

Newtonrsquos 1 st law an object will move withconstant speed in a straight line except whenacted upon by a net force when a driver stops the car suddenly thedriver fall forwards because the driverrsquos bodytry to maintain its speedConsequently a seatbelt holds the driver andprevents the driver from falling forwardswhen the car stops

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 816

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 916

Airbag and Momentum amp

ImpulseEvery object has momentumMomentum consists of a driverrsquos mass and velocity - Momentum ( p ) and Impulse ( FDt )

- p = mv FΔt = mΔv There has to be a force in order to stop the driverrsquosmomentumThe driver may hits the dashboard or windshield which also acts as a force stopping the driver but it injures them at the same timeBy the way Airbag gives a force over time (Impulse) The more the the force acts on the driver to slowhim down the less damage caused to the driver

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1016

Crumple Zone

It is also known as crashzoneIt absorbs energy from a

collision and reduce theforce of a collisionBending during a car crashincreases time to halt the

carNewtonrsquos first and secondlaws are applied tocrumple zone

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1116

Newtonrsquos First Law

Newtonrsquos First Law (The law of inertia) Many people are injured because of the lawof inertiaAlthough the car stops the person insidedoes not stopAn unbalance force crumple zone lowers the

tendency of people to move forward in carcrash

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1216

Crumple Zone

Newtonrsquos Second Law The second law is expressed in equation formas F=MA (F= force M= mass A=acceleration)A=VT (V= velocity T= time)More time means less accelerationLess acceleration by increased time reducesforce that applies to people inside of the car

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1316

What new insight does this

topic provide to youMany people think tirersquos surface guaranteeyour safety 100 but tirersquos surface justmakes you safe on the snow water or anyother groundSince car body seems easily bend Somepeople think that crumple zone makes the carless protectedHowever It is just misconception In factcrumple zone makes car more safe

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1416

What new insight does this

topic provide to youA misconception of AWD and 4WD is thatthey are saferIn fact they help little bit in cornering anddriving on snowHowever it has nothing to do with brakingability

AWD and 4WD do not provide additionalability for steeringAWD and 4WD do not provide additionalability for braking

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1516

What new insight does this

topic provide to youEven if the carrsquos safety improve this is whathappen if you drive too fast

httpsoccerlinecokrslboardviewphpuid=1992352704amppage=1ampcode=streamingboardampkeyfield=subjectampkey=C2F7ampperiod=0|1992454226

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 616

Automobiles Tires amp

Friction

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 716

Seatbelt and Inertia

Newtonrsquos 1 st law an object will move withconstant speed in a straight line except whenacted upon by a net force when a driver stops the car suddenly thedriver fall forwards because the driverrsquos bodytry to maintain its speedConsequently a seatbelt holds the driver andprevents the driver from falling forwardswhen the car stops

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 816

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 916

Airbag and Momentum amp

ImpulseEvery object has momentumMomentum consists of a driverrsquos mass and velocity - Momentum ( p ) and Impulse ( FDt )

- p = mv FΔt = mΔv There has to be a force in order to stop the driverrsquosmomentumThe driver may hits the dashboard or windshield which also acts as a force stopping the driver but it injures them at the same timeBy the way Airbag gives a force over time (Impulse) The more the the force acts on the driver to slowhim down the less damage caused to the driver

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1016

Crumple Zone

It is also known as crashzoneIt absorbs energy from a

collision and reduce theforce of a collisionBending during a car crashincreases time to halt the

carNewtonrsquos first and secondlaws are applied tocrumple zone

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1116

Newtonrsquos First Law

Newtonrsquos First Law (The law of inertia) Many people are injured because of the lawof inertiaAlthough the car stops the person insidedoes not stopAn unbalance force crumple zone lowers the

tendency of people to move forward in carcrash

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1216

Crumple Zone

Newtonrsquos Second Law The second law is expressed in equation formas F=MA (F= force M= mass A=acceleration)A=VT (V= velocity T= time)More time means less accelerationLess acceleration by increased time reducesforce that applies to people inside of the car

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1316

What new insight does this

topic provide to youMany people think tirersquos surface guaranteeyour safety 100 but tirersquos surface justmakes you safe on the snow water or anyother groundSince car body seems easily bend Somepeople think that crumple zone makes the carless protectedHowever It is just misconception In factcrumple zone makes car more safe

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1416

What new insight does this

topic provide to youA misconception of AWD and 4WD is thatthey are saferIn fact they help little bit in cornering anddriving on snowHowever it has nothing to do with brakingability

AWD and 4WD do not provide additionalability for steeringAWD and 4WD do not provide additionalability for braking

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1516

What new insight does this

topic provide to youEven if the carrsquos safety improve this is whathappen if you drive too fast

httpsoccerlinecokrslboardviewphpuid=1992352704amppage=1ampcode=streamingboardampkeyfield=subjectampkey=C2F7ampperiod=0|1992454226

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 716

Seatbelt and Inertia

Newtonrsquos 1 st law an object will move withconstant speed in a straight line except whenacted upon by a net force when a driver stops the car suddenly thedriver fall forwards because the driverrsquos bodytry to maintain its speedConsequently a seatbelt holds the driver andprevents the driver from falling forwardswhen the car stops

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 816

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 916

Airbag and Momentum amp

ImpulseEvery object has momentumMomentum consists of a driverrsquos mass and velocity - Momentum ( p ) and Impulse ( FDt )

- p = mv FΔt = mΔv There has to be a force in order to stop the driverrsquosmomentumThe driver may hits the dashboard or windshield which also acts as a force stopping the driver but it injures them at the same timeBy the way Airbag gives a force over time (Impulse) The more the the force acts on the driver to slowhim down the less damage caused to the driver

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1016

Crumple Zone

It is also known as crashzoneIt absorbs energy from a

collision and reduce theforce of a collisionBending during a car crashincreases time to halt the

carNewtonrsquos first and secondlaws are applied tocrumple zone

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1116

Newtonrsquos First Law

Newtonrsquos First Law (The law of inertia) Many people are injured because of the lawof inertiaAlthough the car stops the person insidedoes not stopAn unbalance force crumple zone lowers the

tendency of people to move forward in carcrash

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1216

Crumple Zone

Newtonrsquos Second Law The second law is expressed in equation formas F=MA (F= force M= mass A=acceleration)A=VT (V= velocity T= time)More time means less accelerationLess acceleration by increased time reducesforce that applies to people inside of the car

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1316

What new insight does this

topic provide to youMany people think tirersquos surface guaranteeyour safety 100 but tirersquos surface justmakes you safe on the snow water or anyother groundSince car body seems easily bend Somepeople think that crumple zone makes the carless protectedHowever It is just misconception In factcrumple zone makes car more safe

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1416

What new insight does this

topic provide to youA misconception of AWD and 4WD is thatthey are saferIn fact they help little bit in cornering anddriving on snowHowever it has nothing to do with brakingability

AWD and 4WD do not provide additionalability for steeringAWD and 4WD do not provide additionalability for braking

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1516

What new insight does this

topic provide to youEven if the carrsquos safety improve this is whathappen if you drive too fast

httpsoccerlinecokrslboardviewphpuid=1992352704amppage=1ampcode=streamingboardampkeyfield=subjectampkey=C2F7ampperiod=0|1992454226

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 816

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 916

Airbag and Momentum amp

ImpulseEvery object has momentumMomentum consists of a driverrsquos mass and velocity - Momentum ( p ) and Impulse ( FDt )

- p = mv FΔt = mΔv There has to be a force in order to stop the driverrsquosmomentumThe driver may hits the dashboard or windshield which also acts as a force stopping the driver but it injures them at the same timeBy the way Airbag gives a force over time (Impulse) The more the the force acts on the driver to slowhim down the less damage caused to the driver

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1016

Crumple Zone

It is also known as crashzoneIt absorbs energy from a

collision and reduce theforce of a collisionBending during a car crashincreases time to halt the

carNewtonrsquos first and secondlaws are applied tocrumple zone

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1116

Newtonrsquos First Law

Newtonrsquos First Law (The law of inertia) Many people are injured because of the lawof inertiaAlthough the car stops the person insidedoes not stopAn unbalance force crumple zone lowers the

tendency of people to move forward in carcrash

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1216

Crumple Zone

Newtonrsquos Second Law The second law is expressed in equation formas F=MA (F= force M= mass A=acceleration)A=VT (V= velocity T= time)More time means less accelerationLess acceleration by increased time reducesforce that applies to people inside of the car

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1316

What new insight does this

topic provide to youMany people think tirersquos surface guaranteeyour safety 100 but tirersquos surface justmakes you safe on the snow water or anyother groundSince car body seems easily bend Somepeople think that crumple zone makes the carless protectedHowever It is just misconception In factcrumple zone makes car more safe

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1416

What new insight does this

topic provide to youA misconception of AWD and 4WD is thatthey are saferIn fact they help little bit in cornering anddriving on snowHowever it has nothing to do with brakingability

AWD and 4WD do not provide additionalability for steeringAWD and 4WD do not provide additionalability for braking

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1516

What new insight does this

topic provide to youEven if the carrsquos safety improve this is whathappen if you drive too fast

httpsoccerlinecokrslboardviewphpuid=1992352704amppage=1ampcode=streamingboardampkeyfield=subjectampkey=C2F7ampperiod=0|1992454226

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 916

Airbag and Momentum amp

ImpulseEvery object has momentumMomentum consists of a driverrsquos mass and velocity - Momentum ( p ) and Impulse ( FDt )

- p = mv FΔt = mΔv There has to be a force in order to stop the driverrsquosmomentumThe driver may hits the dashboard or windshield which also acts as a force stopping the driver but it injures them at the same timeBy the way Airbag gives a force over time (Impulse) The more the the force acts on the driver to slowhim down the less damage caused to the driver

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1016

Crumple Zone

It is also known as crashzoneIt absorbs energy from a

collision and reduce theforce of a collisionBending during a car crashincreases time to halt the

carNewtonrsquos first and secondlaws are applied tocrumple zone

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1116

Newtonrsquos First Law

Newtonrsquos First Law (The law of inertia) Many people are injured because of the lawof inertiaAlthough the car stops the person insidedoes not stopAn unbalance force crumple zone lowers the

tendency of people to move forward in carcrash

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1216

Crumple Zone

Newtonrsquos Second Law The second law is expressed in equation formas F=MA (F= force M= mass A=acceleration)A=VT (V= velocity T= time)More time means less accelerationLess acceleration by increased time reducesforce that applies to people inside of the car

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1316

What new insight does this

topic provide to youMany people think tirersquos surface guaranteeyour safety 100 but tirersquos surface justmakes you safe on the snow water or anyother groundSince car body seems easily bend Somepeople think that crumple zone makes the carless protectedHowever It is just misconception In factcrumple zone makes car more safe

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1416

What new insight does this

topic provide to youA misconception of AWD and 4WD is thatthey are saferIn fact they help little bit in cornering anddriving on snowHowever it has nothing to do with brakingability

AWD and 4WD do not provide additionalability for steeringAWD and 4WD do not provide additionalability for braking

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1516

What new insight does this

topic provide to youEven if the carrsquos safety improve this is whathappen if you drive too fast

httpsoccerlinecokrslboardviewphpuid=1992352704amppage=1ampcode=streamingboardampkeyfield=subjectampkey=C2F7ampperiod=0|1992454226

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1016

Crumple Zone

It is also known as crashzoneIt absorbs energy from a

collision and reduce theforce of a collisionBending during a car crashincreases time to halt the

carNewtonrsquos first and secondlaws are applied tocrumple zone

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1116

Newtonrsquos First Law

Newtonrsquos First Law (The law of inertia) Many people are injured because of the lawof inertiaAlthough the car stops the person insidedoes not stopAn unbalance force crumple zone lowers the

tendency of people to move forward in carcrash

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1216

Crumple Zone

Newtonrsquos Second Law The second law is expressed in equation formas F=MA (F= force M= mass A=acceleration)A=VT (V= velocity T= time)More time means less accelerationLess acceleration by increased time reducesforce that applies to people inside of the car

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1316

What new insight does this

topic provide to youMany people think tirersquos surface guaranteeyour safety 100 but tirersquos surface justmakes you safe on the snow water or anyother groundSince car body seems easily bend Somepeople think that crumple zone makes the carless protectedHowever It is just misconception In factcrumple zone makes car more safe

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1416

What new insight does this

topic provide to youA misconception of AWD and 4WD is thatthey are saferIn fact they help little bit in cornering anddriving on snowHowever it has nothing to do with brakingability

AWD and 4WD do not provide additionalability for steeringAWD and 4WD do not provide additionalability for braking

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1516

What new insight does this

topic provide to youEven if the carrsquos safety improve this is whathappen if you drive too fast

httpsoccerlinecokrslboardviewphpuid=1992352704amppage=1ampcode=streamingboardampkeyfield=subjectampkey=C2F7ampperiod=0|1992454226

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1116

Newtonrsquos First Law

Newtonrsquos First Law (The law of inertia) Many people are injured because of the lawof inertiaAlthough the car stops the person insidedoes not stopAn unbalance force crumple zone lowers the

tendency of people to move forward in carcrash

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1216

Crumple Zone

Newtonrsquos Second Law The second law is expressed in equation formas F=MA (F= force M= mass A=acceleration)A=VT (V= velocity T= time)More time means less accelerationLess acceleration by increased time reducesforce that applies to people inside of the car

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1316

What new insight does this

topic provide to youMany people think tirersquos surface guaranteeyour safety 100 but tirersquos surface justmakes you safe on the snow water or anyother groundSince car body seems easily bend Somepeople think that crumple zone makes the carless protectedHowever It is just misconception In factcrumple zone makes car more safe

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1416

What new insight does this

topic provide to youA misconception of AWD and 4WD is thatthey are saferIn fact they help little bit in cornering anddriving on snowHowever it has nothing to do with brakingability

AWD and 4WD do not provide additionalability for steeringAWD and 4WD do not provide additionalability for braking

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1516

What new insight does this

topic provide to youEven if the carrsquos safety improve this is whathappen if you drive too fast

httpsoccerlinecokrslboardviewphpuid=1992352704amppage=1ampcode=streamingboardampkeyfield=subjectampkey=C2F7ampperiod=0|1992454226

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1216

Crumple Zone

Newtonrsquos Second Law The second law is expressed in equation formas F=MA (F= force M= mass A=acceleration)A=VT (V= velocity T= time)More time means less accelerationLess acceleration by increased time reducesforce that applies to people inside of the car

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1316

What new insight does this

topic provide to youMany people think tirersquos surface guaranteeyour safety 100 but tirersquos surface justmakes you safe on the snow water or anyother groundSince car body seems easily bend Somepeople think that crumple zone makes the carless protectedHowever It is just misconception In factcrumple zone makes car more safe

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1416

What new insight does this

topic provide to youA misconception of AWD and 4WD is thatthey are saferIn fact they help little bit in cornering anddriving on snowHowever it has nothing to do with brakingability

AWD and 4WD do not provide additionalability for steeringAWD and 4WD do not provide additionalability for braking

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1516

What new insight does this

topic provide to youEven if the carrsquos safety improve this is whathappen if you drive too fast

httpsoccerlinecokrslboardviewphpuid=1992352704amppage=1ampcode=streamingboardampkeyfield=subjectampkey=C2F7ampperiod=0|1992454226

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1316

What new insight does this

topic provide to youMany people think tirersquos surface guaranteeyour safety 100 but tirersquos surface justmakes you safe on the snow water or anyother groundSince car body seems easily bend Somepeople think that crumple zone makes the carless protectedHowever It is just misconception In factcrumple zone makes car more safe

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1416

What new insight does this

topic provide to youA misconception of AWD and 4WD is thatthey are saferIn fact they help little bit in cornering anddriving on snowHowever it has nothing to do with brakingability

AWD and 4WD do not provide additionalability for steeringAWD and 4WD do not provide additionalability for braking

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1516

What new insight does this

topic provide to youEven if the carrsquos safety improve this is whathappen if you drive too fast

httpsoccerlinecokrslboardviewphpuid=1992352704amppage=1ampcode=streamingboardampkeyfield=subjectampkey=C2F7ampperiod=0|1992454226

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1416

What new insight does this

topic provide to youA misconception of AWD and 4WD is thatthey are saferIn fact they help little bit in cornering anddriving on snowHowever it has nothing to do with brakingability

AWD and 4WD do not provide additionalability for steeringAWD and 4WD do not provide additionalability for braking

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1516

What new insight does this

topic provide to youEven if the carrsquos safety improve this is whathappen if you drive too fast

httpsoccerlinecokrslboardviewphpuid=1992352704amppage=1ampcode=streamingboardampkeyfield=subjectampkey=C2F7ampperiod=0|1992454226

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1516

What new insight does this

topic provide to youEven if the carrsquos safety improve this is whathappen if you drive too fast

httpsoccerlinecokrslboardviewphpuid=1992352704amppage=1ampcode=streamingboardampkeyfield=subjectampkey=C2F7ampperiod=0|1992454226

8122019 08_Car Safety and Physics

httpslidepdfcomreaderfull08car-safety-and-physics 1616

references and bibliography

httpautohowstuffworkscomunder-the-hoodcar-part-longevitybrake-pads-last1htm httphyperphysicsphy-astrgsueduhbasemechanicsfrictirehtml httpwwwworsleyschoolnetsciencefilestiresandfrictionhtml httptristanmactripodcomid14html httptristanmactripodcomid8html httpautofyz6wordpresscom20080423the-physics-of-seat-belts httphyperphysicsphy-astrgsueduhbaseseatbhtml httpwebcvcaroyalsorg~rheckathorndocuments PhysicsofCarCrashesteachersguidepdf httpwwwwheelsnextcomcontenttire_corneringhtml

httpconsumerguideautohowstuffworkscomyour-ride-4wd-vs-awd-cga htm httpwwwphysicsclassroomcomclassnewtlawsu2l3acfm httpwwwtoledotechnologyacademyorgDocumentsPhySci20DocsEnrich2-3pdf httpwwwgcsesciencecompfm46html