FreefallMotion for which the only force acting is the force of gravity. It can be moving up or down.(Air friction is negligible)

Negligible – So insignificant as to be unworthy of consideration

Objects in freefall all have the same constant acceleration even though the force of gravity is different.

22108.9s

m

s

mgag

Fg

Fg

a = -10 m/s2

0

t x v a

0 125 0 -10

1 -10

2 -10

3 -10

4 -10

5 -10

-10

-20

-30

-40

-50

120

105

80

45

0

Graphical

Algebraic

2

2

1attvxx oo

atvv o

210s

ma

Example 1: A ball is thrown straight up from a height of 5 meters with an initial velocity of 30m/s. What is the maximum height of the ball?

30m/s

5m

Example 2: A ball is thrown straight up off a cliff with a velocity of 20m/s. How long will the ball be in the air and what will its velocity be just before it hits the ground?

20m/s

v = 0m/s

12m