Free-Falling Motion

A skydiver jumps out of a plane and is falling towards the Earth before she opens her parachute.

• She is in free fall because nothing is holding her up.

• She is in free fall because gravity is pulling her down.

• She is not in free fall because skydiving is an expensive hobby.

• She is not in free fall because gravity is not the only force she is experiencing.

What is the acceleration of a ball that is dropped off the side of a cliff after 1,2,3,4,5 seconds? (assume g is rounded to 10 m/s²)

• 5,10,15, 20, 25 m/s²
• 10, 20, 30, 40, 50 m/s²
• 5, 20, 45, 80, 125 m/s²
• 10,10,10,10,10 m/s²

Using g = -10 m/s²:

A ball is tossed up from the ground at a speed of 40 m/s. At how many seconds will it be travelling at a speed of 20 m/s?

(Choose all that apply)

• 2

• 4

• 6

• 8

The change in velocity in a given time period is?

• Vi
• Vf
• a
• d

When an object falls in physics world, what happens?

• It accelerates at a constant rate until it hits the ground
• It accelerates at a non-constant rate until it hits the ground
• It accelerates at a constant rate until it reaches terminal velocity
• It accelerates at a non-constant rate until it reaches terminal velocity