ATE910 – Technology Exploration

EOT- Worksheet LC21. True/False

a. The pulley where the effort is applied is called the driver pulley. (T / F)

b. Pulley and gears are kind of wheels. (T / F)

c. Belt driven pulleys always have the same direction of rotation. (T / F)

d. For the fixed pulley the load = effort. (T / F)

e. For the movable pulley the load = ½ the effort (T / F)

f. The compound pulley is a system of two movable pulleys. (T / F)

g. When the drive pulley is smaller than the driven pulley the speed at the driven pulley will be less. (T / F)

h. For driven-pulleys of the same size they will have same speed.(T / F)

i. When the driver pulley is larger than the driven pulley the output speed is less. (T / F)

j. Given that the driver pulley is larger than the driven pulley, the output force will be less. (T / F)

k. Higher gear ratio will give higher force and less speed. (T / F)

l. The driven & driver gears always rotate in the opposite direction. (T / F)

m. When using a fixed pulley the load move up (pulled up) by the same distance the rope will travel. (T / F)

n. A small gear ratio means the driver gear is the smaller gear. (T / F)

o. To move an object straight upwards with a shorter distance requires less effort than raising it up gradually for a longer distance. (T / F)

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p. As the distance of the inclined plane increases the effort needed decreases. (T / F)

q. Inclined planes are used to split things apart. (T / F)

r. The Inclined plane could move but the wedge cannot. (T / F)

s. The sharper the wedge the more the effort. (T / F)

t. The pitch of a screw is number of threads per screw length. (T / F)

u. Screws are inclined planes wrapped around a cylinder. (T / F)

v. The finer the screw the better the screw is. (T / F)

w. More threads less effort. (T / F)

x. For a wedge it could have only one slanted surface.( T / F)

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2. Fill in the blanks with the proper word.

a. ………………… gears are used between the driver gear and the driven gear to make the driver and driven gear rotate in the same direction.

b. The sharper the angle of the wedge, the more …………………………………it will have.

c. A ……………………… is an energy storage device.d. A capacitor has two layers of ……………………….. and

…………………………………….e. The least effort needed when use pulleys is using the …………………………

pulley.f. The finer the screw the more ………………………. Required.g. The food you eat is an example on …………………………. Energy.h. Sleeping over the night makes you gain ……………………………… energy.i. A flying bird is an example on ………………………………. Energy.j. Energy stored in the batteries is kind of ……………………………energy.

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kinetic. conductor. fixed. insulator. Reciprocating. movable. chemical

Idler potential electrical capacitor. compound. Mechanical advantage.

turns. Rotary.

3. Circle the correct answer:a. The mechanical advantage of a movable pulley is

i. 3ii. Less than 1

iii. 2iv. 1

b. A compound pulley of 160 N load needs an effort of

i. 160 Nii. 60 N

iii. 80 Niv. 100 N

c. The Gear ratio is calculated using the following formula

i. N2/N1= driven/driverii. N1/N2 = Driver/ Driven

iii. N2.N1= Driven x Driveriv. None of the above

d. A screw which has 10 threads per cm what is the pitch:

i. 1ii. 10/1

iii. 1/10iv. 10

e. All are examples on wheels except:

i. Gearsii. Door knob

iii. Clockiv. Seesaw

f. For a 2 m wheel and 50 cm axle the mechanical advantage is:

i. 1ii. 10

iii. 25iv. 4

g. Moving Pyramid stones is an example on:

i. Wedgeii. Inclined plane

iii. Screwiv. a+b

h. The Inclined plane Mechanical advantage is:

i. D/Hii. H/D

iii. Slope/Thicknessiv. Thickness/ Slope

i. The number of screw threads, …………….. are used to calculate the mechanical advantage of a screw:

i. Diameter ii. Length

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iii. Circumference. iv. All of the above

j. A wedge sharpness is directly proportional to

i. Loadii. Effort

iii. Thicknessiv. Weight

k. The higher the mechanical advantage of a simple machine the

i. Worst the machineii. better the machine

iii. does not affectiv. none of the above

l. The load in the case of screws and wedges is

i. Object to load ii. Object to carry

iii. Frictioniv. None of the above

m. An electrical machine that converts electrical energy to mechanical energy

i. Capacitorii. motor

iii. generatoriv. None of the above

n. An electrical machine that converts mechanical energy to electrical energy

i. Capacitorii. motor

iii. generatoriv. None of the above

o. A device used to store electrical energy

i. Capacitorii. motor

iii. generatoriv. None of the above

4. Define a. Inclined plane

b. energy

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c. Capacitor: A capacitor is a device that could be used to store electrical energy.

d. pulley car

e. pitch

f. Electrical energy: Electrical energy is delivered by tiny charged particles called electrons, typically moving through a wire.

g. Electrical machine is a device that converts either mechanical energy to electrical energy or vice versa.

5. What is the difference between a motor and a generator

Both are examples on electrical machines but a motor is used to convert electrical energy to mechanical energy while the generator is used to generate electricity from mechanical energy.

6. Wheels and axles rotate at the same frequency but the wheel rotates at greater speed, explain why by drawing?

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7. Find the following1. Calculate:

o Find the MA and the pitch value for each screw

o Which screw is finer?

o Which screw will need less effort?

Screw1: ¼ length6 threads, r=1cm

Screw2: ½ length18 threads, r=1.5cm

Screw3: 1 cm length24 threads, r=2.5

Screw 1

Screw 2

Screw 3

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2.

1. What is the height of the inclined plane?

2. What is the length of the inclined plane?

3. What is the mechanical advantage of the inclined plane?

3. How much effort force would be needed to push the dump truck up the mountain?

Calculate the Gear Ratio:

Gear Ratio1 GR=20/40

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2 GR=50/10

1. Someone wants to slide a 100 pound crate up an incline to a loading dock 4 feet above the ground. The incline is 20 feet long. How much effort will it take to slide the crate up the incline?

2. Find the mechanical advantage for the following.

3. Find the MA of the following Screw? Threads= 150, length =30 cm, shank =8 cm

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8. Identify the type of energy (kinetic, potential)

The arrow

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9. Identify the following as Screw, Wedge or Inclined plane:

Inclined Screw

Inclined inclined

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screw Wedge

Wedge and inclined wedge

Inclined Wedge

Inclined screw

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10. Match the following

11.Draw the energy transfer diagram for the following Lamp

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8

9

3

6

5

7

1

2

4

1 Kinetic

2 Heat

3 Light

4 Gravitational potential

5 Chemical

6 Sound

7 Elastic potential

8 Nuclear

9 electric

Electrical energyMechanical energy

Heat energy

1. Draw the energy diagram for the toaster

2. Draw the simple energy transfer diagram of the following:

Car Engine:

Plant

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Chemical energy Mechanical energy

Light energy Chemical energy

Electric Guitar

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Sound energyMechanical energy