What makes an object in free fall?
There is only the gravitational force and no others.
What is the acceleration of gravity?
10 m/s^2 downward
A small ball is released from a window at t = 0. Assuming free-fall conditions, how far does it travel in 2.8 seconds?
39m
Which object will hit the ground first in free fall if it was dropped at the same height? A pencil or an elephant? (ignore air resistance)
Both at the same time.
A rock is dropped from a garage roof from rest. The rock hits the ground in 3s
Determine the velocity of the rock as it hits the ground.
-30m/s (or 30m/s down)
A second rock is projected straight upward from ground level at the moment the first rock was released. This second rock had an initial upward velocity of +6.0 m/s. How long will this second rock take to reach maximum height?
0.6s
When a ball is thrown straight up with no air resistance, which direction is it accelerating at its highest point?
Downwards
If the acceleration due to gravity on the moon is 1/6 the acceleration due to gravity on the Earth, how long did the feather take to fall 1.0 m?
1.1s