Show:
Free Fall
Speed/Velocity
Acceleration
Calculations
100

What makes an object in free fall?

There is only the gravitational force and no others.

100
What is the velocity of a car when it remains at rest?
Zero Velocity
100

What is the acceleration of gravity?

10 m/s^2 downward

100

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

200

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.

200
What is the difference between speed and velocity?
Speed has only magnitude, but velocity has both magnitude and direction.
200
What is acceleration?
Change in velocity
200

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)

300
Does how heavy an object is affect the acceleration during free fall?
No, it does not affect acceleration. Acceleration will always be the same during free fall.
300
You throw a ball up. When does a ball have a velocity of zero?
At the highest point where the object stops going up.
300
If the speed of the car is NOT zero, can the acceleration be zero?
Yes, it means the car will be moving at a constant speed and there is no change in its speed.
300

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

400

When a ball is thrown straight up with no air resistance, which direction is it accelerating at its highest point?

Downwards

400
What does speedometer in the car measures? Speed or Velocity?
Speed, it only tells you how fast you are going, not the direction.
400
When is the acceleration at the highest during free fall?
The acceleration is always the same at any point during free fall.
400

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