Physics 432
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Free Fall Practice
FREE FALLIN’ PROBLEMS
1. An object moves as shown in the picture below.
a.Draw a d vs. t graph .
b. Draw a v vs. t graph.
c. Draw an acceleration vs. t graph.
2. A tourist drops a rock from rest from a guard rail overlooking a valley. What is the
velocity of the rock at 4.0 s? What is the displacement of the rock at 4.0 s?
3. Suppose the tourist in question #2 instead threw the rock down with an initial velocity of 8.0
m/s. Determine the velocity and displacement of the rock at 4.0 s.
4. A man is standing on the edge of a 20.0 m high cliff. He throws a rock vertically with an
initial velocity of 10.0 m/s.
a) How high does the rock go? (Remember that at its max height v = 0 m/s)
b) How long does it take to reach its max height?
5.
I drop a penny from the top of the roof of Schaumburg High School and it takes 1.85
seconds to hit the ground. Calculate the velocity in m/s after 1.10 seconds of freefall and
calculate the velocity at impact.
6. Upton Chuck is riding the Giant Drop at Great America. If Upton free falls for 2.6
seconds, what will be his final velocity and how far will he fall?
7. A feather is dropped on the moon from a height of 1.40 meters. The acceleration of
gravity on the moon is 1.67 m/s2. Determine the time for the feather to fall to the surface
of the moon.
8.
If Michael Jordan has a vertical leap of 1.29 m, then what is his takeoff speed and his
hang time (total time to move upwards to the peak and then return to the ground)?
9. The observation deck of tall skyscraper 370 m above the street. Determine the time
required for a penny to free fall from the deck to the street below.
10. With what speed in miles/hr (1 m/s = 2.23 mi/hr) must an object be thrown to reach a
height of 91.5 m (equivalent to one football field)? Assume negligible air resistance.