Name___________________________________________
Period______________ Date______________
Chapter 9 Practice Test – Impulse and Momentum
1. The linear momentum of an object can be calculated by multiplying the mass of the object by its __________.
a. acceleration
c. impulse
b. velocity
d. time
2. The greatest change in momentum will be produced by a ______________.
a. Large force acting over a long time
b. Small force acting over a short time
c. Large force acting over a short time
3. Impulse can be represented by __________.
a. ∆v/∆t
b. F∆t
c. mv
d. m/v
4. When a golf club hits a golf ball, the change in momentum of the ball is _______ the change in momentum of
the club.
a. equal to
b. greater than
c. less than
5. A person is standing on roller blades and is holding a heavy medicine ball. If he throws the medicine ball
horizontally to the right, what will be his resulting motion?
a. to the right
c. backward
b. to the left
d. no motion
6. Two moving objects collide and move on paths that are 120 ̊ apart. The total momentum of the objects after the
collision is ______________ the total momentum before the collision.
a. equal to
b. greater than
c. less than
7. Which has more momentum, a larger truck moving at 30 miles per hour or a small truck moving at 30 miles per
hour?
a. the large truck
b. the small truck
c. both have the same momentum
8. If the momentum of an object changes and its mass remains constant
a. its velocity is changing
c. there is a force acting on it
b. it is accelerating (or decelerating)
d. all of the above
9. If Superman at rest in free space throws an asteroid that has more mass than Superman, then which moves
faster?
a. the asteroid
c. they both move at the same speed
b. Superman
d. neither move
10. The cannonball shot from a cannon with a longer barrel will be faster because the cannonball receives a greater
a. force
c. both of these
b. impulse
d. neither of these
11. Tony the skater traveling at high speed needs a certain amount of force to stop him. More stopping force will be
needed if he has
a. more mass
c. more momentum
b. less stopping distance
d. all of these
12. What is the momentum of a 145 gram baseball traveling at +40.0 m/s?
13. What impulse is needed to stop a 45 gram mass traveling at a velocity of -42 m/s?
14. A force with a magnitude of 540 N is used to stop an object with a mass of 65 kg moving at a velocity of +175
m/s. How long will it take to bring the object to a full stop?
15. A .2kg hockey puck, moving at 30 m/s strikes a .3 kg stationary octopus thrown onto the ice by a hockey fan.
The puck and octopus slide off together. Find their velocity.
16. A 3kg block is released from rest on a 1.5 m frictionless plane, inclined at an angle of 30 degrees. The block
slides down the incline and strikes a second brick weighing 40 N. (a) Calculate the speed of the first brick at the
bottom of the incline. (b) If the two bricks stick together, with what initial speed will they move along?
17. Ball A, rolling west at 4.0 m/s, has a mass of 2.0 kg. Ball B has a mass of 3.0 kg and is stationary. After colliding
with ball B, ball A moves south at 2.0 m/s. (a) Calculate the momentum of ball B after the collision.