Linear momentum and Impulse
1. You’re disgusted with your computer and give it a whack. If your hand is in contact with the
computer for 100.0 milliseconds with a force of 100.0 N, what impulse do you impart to the
computer?
2. You’re standing under the eaves of your house when a huge icicle breaks off and hits you,
imparting a force of 300.0 N for 0.10 seconds. What was the impulse?
3. You’re running north at 3.0 ms-1. If you have a mass of 80.0 kg, what is your momentum?
4. You’re falling out of an airplane, and before opening your parachute, you hit a speed of 100.0 ms-1.
What is your momentum if you have a mass of 80.0 kg?
5. You’re pushing a 10.0 kg box of dishes across the kitchen floor at a rate of 4.0 ms-1. What is its
momentum?
6. You’re pushing an 800.0 kg car down the road, and it’s going at 6.0 ms-1 west. How much
momentum does it have?
7. You hit a hockey puck, mass 450 g, with a force of 150 N for 0.10 seconds. If it started at rest, what
is its final speed?
8. You’re standing on an ice rink when another skater hits you, imparting a force of 200.0 N for 0.20
seconds. If you have a mass of 90.0 kg, what is your final speed?
9. You kick a 1.0 kg soccer ball with a force of 400.0 N for 0.20 seconds. What is its final speed?
10. You hit a 400 g baseball with a force of 400.0 N for 0.10 seconds. The baseball was traveling
toward you at 40 ms-1. What is its final speed?
11. A 450 g hockey puck traveling at 60 ms-1 hits a stationary puck. If the first puck ends up going at
20 m-1 in the same direction as the second puck, how fast is the second puck moving?
12. You’re driving a bumper car at a circus at 18 ms-1, and you hit another car that’s at rest. If you end
up going at 6.0 ms-1, what is the final speed of the other car, given that both cars have 100.0 kg
mass, you have 80.0 kg mass, and the other persoon has a mass of 70.0 kg?
13. On the athletic field, a golf ball with a mass of 0.20 kg and speed of 100.0 ms-1 hits a soccer ball at
rest that has a mass of 1.0 kg. If the golf ball ends up at rest, what is the soccer ball’s final speed,
given that it travels in the same direction as the golf ball was originally traveling?
14. You’re stopped at a traffic light when a 1000.0 kg car (including driver) hits you from behind at
40.0 ms-1. Ouch. If the other car ends up moving at 12 ms-1, and if you and your car have a mass of
940 kg, what is your final speed?
15. A 450 g hockey puck traveling at 60.0 ms-1 hits a stationary puck with the same mass. What are the
final speeds of the pucks, given that the collision is elastic and that all motion takes place along the
same line?
16. You’re driving a bumper car at 23 ms-1, and you hit another bumper car that’s at rest. If you and
your car have a mass of 300 kg, and the mass of the other car and driver is 240 kg, what are the
final speeds of the cars?
17. Assume that the two objects in Figure 8-1 are hockey pucks of equal mass. Assuming that vo1 = 15
ms-1, vo2 = 7.0 ms-1, and vf2 = 7.0 ms-1, what are θ and vf1, assuming that momentum is conserved
but kinetic energy is not?
18. Assume that the two objects in Figure 8-2 are tennis balls of equal mass. Assuming that vo1 = 12
ms-1, vo2 = 8.0 ms-1, and vf2 = 6.0 ms-1, what are θ and vf1, assuming that momentum is conserved
but kinetic energy is not?