Practice Questions from Module 1:
Answer the following theory questions. E-mail your answers to your "homework buddy" and
send them feedback on their responses. Remember to cc a copy to me. Once I receive your
answers I will e-mail you back with the solutions.
1.
2.
3.
4.
How can a coin and a feather in a vacuum tube fall with the same acceleration?
Why do a coin and a feather fall with different accelerations in the presence of air?
How much air resistance acts on a 100-N bag of nails that falls at its terminal speed?
All things being equal, why does a heavy skydiver have a greater terminal speed than a
lighter skydiver?
5. What can be done so that both terminal speeds are equal?
6. After she jumps, a skydiver reaches terminal speed after 10 seconds. Does she gain
more speed during the first second of fall or the ninth second of fall? Compared to the
first second of fall, does she fall a greater or a lesser distance during the ninth second?
Answer the following question. The solution is given below, but make a fair attempt to do the
question on your own. If you are having difficulty or do not understand the solution you can
either e-mail your "homework buddy" or myself.
1. A stone is dropped from a 100 m cliff. What is the velocity of the stone after 3 seconds?
When does the stone hit the ground? With what velocity does the stone hit the ground?
Ignore air resistance.