F R E E

F A L L

F R E E

F A L L

In the absence of air resistance…

All bodies regardless of

SIZEand WEIGHT

It is found that

at the same location above the earth’s surface fallVERTICALLY with the SAME ACCELERATION.

In the absence of air resistance…

All bodies regardless of

SIZEand WEIGHT

It is found that

at the same location above the earth’s surface fallVERTICALLY with the SAME ACCELERATION.

FREEFALL

-is the motion of a body acted upon by gravitational pull only.

-motion that is free from other forces except the gravitational force due to the earth.

FREEFALL

Imagine a straight number line that coincides with the motion.

Choose an origin.

Assign one direction as the positive axis.

The position of a falling object is specified by the y-coordinate of its location.

FREEFALL

EACCEL RATION

EACCEL RATION

How does gravity affect acceleration?

gravity /is/ acceleration!

You've probably heard of the "force of gravity," and you may have heard of the equation “F=ma.”

The thing about gravity is that it has its own number…

In a sense,

EACCEL RATION

How does gravity affect acceleration?

gravity /is/ acceleration!

You've probably heard of the "force of gravity," and you may have heard of the equation "F=ma."

The thing about gravity is that it has its own number…

In a sense,

ARISTOTLE

GALILEOVSGALILEO

VSARISTOTL

E

Use the formula from kinematic equation…

Change x = y

a = -g

Use the formula from kinematic equation…

Change x = y

a = -g

x = y

a = -g

It takes 2.00 seconds for a pebble released from the top of a building to reach the ground. How tall is the building?

12seconds

m =

?

t = 2.00 secondsg = -9.8 m/s^2 = 0 m/s

y = ? (how tall?)

A

B

m

m/s

What time does the ball reach its maximum height?

A

B

m

m/s

What is the velocity of the ball when it returns to its original height?

A

B

m

m/s

What is the maximum heigth of the ball?

a. How tall?b. What is the final

velocity?