1. Use Newton’s laws to explain the following situation.
On a standard pool table, why does a ball stop when it strikes another
ball in a straight line?
2. A 658-kg horse, starting from rest, attains a speed of 8.60 m/s in
3.95 s. Find
a. the average acceleration of the horse.
b. the size of the average force exerted on the road by the horse.
c. the horizontal force the saddle exerts on the rider if the rider has
a mass of 57.4 kg.
3. A 22.5-kg block is sliding along a frictionless surface at a speed
of 37.4 m/s.
a. What force would it take to stop the block in 2.42 seconds?
b. What force is the frictionless surface exerting on the block?
4. A 71.1-kg man travels from an area where gravity is 9.78 m/s2 to where
it is 9.80 m/s2.
a. What is his change in mass?
b. What is his change in weight?
5. A box with a mass of 26 kg is resting on a wooden table. The coefficient
of friction is 0.29. Find the horizontal force necessary to give the box
an acceleration of 1.3 m/s2.
6. A balloon has a gondola with a 171-kg mass. Find the upward acceleration
of the gondola if the balloon exerts an upward force 2382 N.
7. A 74.7-kg man has reached a terminal velocity of 58 m/s while skydiving.
What is the drag force that air resistance is exerting on the man?
8. Explain the relationship between mass and weight on Earth. Would this
relationship change on Mars?
9 . Why is it easier to stop a compact car than a large station wagon
when both are moving at the same speed?
10 . An elevator is traveling from the lobby to the top of the building.
As it stops on the top floor, in which direction is its acceleration?
11 . Explain the difference between action-reaction forces and net forces.
Using the boat shown below, describe an example of each.
12 . What is the relationship between sliding friction and speed? Between
sliding friction and normal force?
13 . Suppose you try to pull a rope tied to a large carton. You cannot
move the carton. What forces are acting on your hand?