1. Which of the following statements are true about momentum?
2. Which of the following are true about the relationship between momentum end energy?
3. Which of the following statements are true about impulse?
4. Which of the following statements are true about collisions?
5. Which of the following statements are true about elastic and inelastic collisions?
6. Which of the following objects have momentum? Include all that apply.
a. an electron orbiting the nucleus of an atom.
b. a UPS truck stopped in front of the school building.
c. a Yugo (a compact car) moving with a constant speed.
d. a small flea moving with constant speed across Fido's back.
e. Glenbrook South High School.
7. A truck driving along a highway road has a large quantity of momentum. If it moves at the same speed but has twice as much mass, its momentum is ________________.
a. zero 
b. quadrupled 
c. doubled 
d. unchanged 
A ball is dropped from the same height upon various flat surfaces. For the same collision time, impulses are smaller when the most bouncing take place.
a. True 
b. False 
9. Consider a karate expert. During a talent show, she executes a swift blow to a cement block and breaks it with her bare hand. During the collision between her hand and the block, the ___.
10. It is NOT possible for a rocket to accelerate in outer space because ____. List all that apply.
11. In order to catch a ball, a baseball player naturally moves his or her hand backward in the direction of the ball's motion. This habit causes the force of impact on the players hand to be reduced in size principally because ___.
12. Suppose that Paul D. Trigger fires a bullet from a gun. The speed of the bullet leaving the muzzle will be the same as the speed of the recoiling gun ____.
13. Suppose that you're driving down the highway and a moth crashes into the windshield of your car. Which undergoes the greater change is momentum?
a. the moth 
b. your car 
c. both the same 
14. Suppose that you're driving down the highway and a moth crashes into the windshield of your car. Which undergoes the greater force?
a. the moth 
b. your car 
c. both the same 
15. Suppose that you're driving down the highway and a moth crashes into the windshield of your car. Which undergoes the greater impulse?
a. the moth 
b. your car 
c. both the same 
16. Suppose that you're driving down the highway and a moth crashes into the windshield of your car. Which undergoes the greater acceleration?
a. the moth 
b. your car 
c. both the same 
17. Three boxes, X, Y, and Z, are at rest on a table as shown in the diagram at the right. The weight of each box is indicated in the diagram. The net or unbalanced force acting on box Y is _____. 



18. In a physics experiment, two equalmass Pasco carts roll towards each other on a level, lowfriction track. One cart rolls rightward at 2 m/s and the other cart rolls leftward at 1 m/s. After the carts collide, they couple (attach together) and roll together with a speed of _____________. Ignore resistive forces.
a. 0.5 m/s 
b. 0.33 m/s 
c. 0.67 m/s 
d. 1.0 m/s 
e. none of these 
19. A physics cart rolls along a lowfriction track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is ____.
a. zero 
b. four times as large 
c. twice as large 
d. unchanged 
20. The firing of a bullet by a rifle causes the rifle to recoil backwards. The speed of the rifle's recoil is smaller than the bullet's forward speed because the ___.
a. force against the rifle is relatively small 
b. speed is mainly concentrated in the bullet 
c. rifle has lots of mass 
d. momentum of the rifle is unchanged 
e. none of these 
21. Two objects, A and B, have the same size and shape. Object A is twice as massive as B. The objects are simultaneously dropped from a high window on a tall building. (Neglect the effect air resistance.) The objects will reach the ground at the same time but object A will have a greater ___. Choose all that apply.
a. speed 
b. acceleration 
c. momentum 
d. none of the above quantities will be greater 
22. Cars are equipped with padded dashboards. In collisions, the padded dashboards would be safer than nonpadded ones because they ____. List all that apply.
a. increase the impact time 
b. decrease an occupant's impulse 
c. decrease the impact force 
d. none of the above 
23. A 4 kg object has a momentum of 12 kg*m/s. The object's speed is ___ m/s.
a. 3 
b. 4 
c. 12 
d. 48 
e. none of these. 
24. A wad of chewed bubble gum is moving with 1 unit of momentum when it collides with a heavy box that is initially at rest. The gum sticks to the box and both are set in motion with a combined momentum that is ___.
a. less than 1 unit 
b. 1 unit 
c. more than 1 unit 
d. not enough information 
25. A relatively large force acting for a relatively long amount of time on a relatively small mass will produce a relatively ______. List all that apply.
a. small velocity change 
b. large velocity change 
c. small momentum change 
d. small acceleration 
26. Consider the recent units on Work and Energy and Momentum and Impulse. Force and time is related to momentum change in the same manner as force and displacement pertains to ___________.
a. impulse 
b. work 
c. energy change 
d. velocity 
e. none of these. 
27. A 5N force is applied to a 3kg ball to change its velocity from +9 m/s to +3 m/s. This impulse causes the momentum change of the ball to be ____ kg*m/s.
a. 2.5 
b. 10 
c. 18 
d. 45 
e. none of these 
28. A 5N force is applied to a 3kg ball to change its velocity from +9 m/s to +3 m/s. The impulse experienced by the ball is ____ N*s.
a. 2.5 
b. 10 
c. 18 
d. 45 
e. none of these 
29. A 5N force is applied to a 3kg ball to change its velocity from +9 m/s to +3 m/s. The impulse is encountered by the ball for a time of ____ seconds.
a. 1.8 
b. 2.5 
c. 3.6 
d. 10 
e. none of these 
30. When a mass M experiences a velocity change of v in a time of t, it experiences a force of F. Assuming the same velocity change of v, the force experienced by a mass of 2M in a time of (1/2)t is ____.
a. 2F 
b. 4F 
c. (1/2)*F 
d. (1/4)*F 
e. none of these 
31. When a mass M experiences a velocity change of v in a time of t, it experiences a force of F. Assuming the same velocity change of v, the force experienced by a mass of 2M in a time of (1/4)t is ____.
a. 2F 
b. 8F 
c. (1/2)*F 
d. (1/8)*F 
e. none of these 
32. When a mass M experiences a velocity change of v in a time of t, it experiences a force of F. Assuming the same velocity change of v, the force experienced by a mass of (1/2)M in a time of (1/2)t is ____.
a. 2F 
b. 4F 
c. (1/2)*F 
d. (1/4)*F 
e. none of these 
33. When a mass M experiences a velocity change of v in a time of t, it experiences a force of F. Assuming the same velocity change of v, the force experienced by a mass of (1/2)M in a time of 4t is ____.
a. 2F 
b. 8F 
c. (1/2)*F 
d. (1/8)*F 
e. none of these 
34. A 0.5kg ball moving at 5 m/s strikes a wall and rebounds in the opposite direction with a speed of 2 m/s. If the impulse occurs for a time duration of 0.01 s, then the average force (magnitude only) acting upon the ball is ____ Newtons.
a. 0.14 
b. 150 
c. 350 
d. 500 
e. none of these 
35. If mass and collision time are equal, then impulses are greater on objects which rebound (or bounce).
a. TRUE 
b. FALSE 
36. Consider the headon collision between a lady bug and the windshield of a high speed bus. Which of the following statements are true? List all that apply.
For questions #3740: Consider the before and aftercollision momentum vectors in the diagram below. Determine the magnitude and direction of the system momentum before and after the collision and identify whether or not momentum is conserved. Finally, determine the magnitude and direction of the net external impulse encountered by the system during the collision.


System Momentum Before Collision: 

System Momentum After Collision: 

Is momentum conserved? 

Net External Impulse During Collision: 



System Momentum Before Collision: 

System Momentum After Collision: 

Is momentum conserved? 

Net External Impulse During Collision: 



System Momentum Before Collision: 

System Momentum After Collision: 

Is momentum conserved? 

Net External Impulse During Collision: 



System Momentum Before Collision: 

System Momentum After Collision: 

Is momentum conserved? 

Net External Impulse During Collision: 

For questions #4144: Repeat the procedure performed in questions #3740. Note that these diagrams give velocity and mass values before and after the collision.


System Momentum Before Collision: 

System Momentum After Collision: 

Is momentum conserved? 

Net External Impulse During Collision: 



System Momentum Before Collision: 

System Momentum After Collision: 

Is momentum conserved? 

Net External Impulse During Collision: 



System Momentum Before Collision: 

System Momentum After Collision: 

Is momentum conserved? 

Net External Impulse During Collision: 



System Momentum Before Collision: 

System Momentum After Collision: 

Is momentum conserved? 

Net External Impulse During Collision: 

For questions #4549, determine the unknown velocity value. Assume that the collisions occur in an isolated system.





For questions #5052, determine the total kinetic energy of the system before and after the collision and identify the collision as being either perfectly elastic, partially inelastic/elastic or perfectly inelastic.


Total System Kinetic Energy Before Collision: 

Total System Kinetic Energy After Collision: 

Perfectly Elastic, Partially Inelastic/Elastic or Perfectly Inelastic? 



Total System Kinetic Energy Before Collision: 

Total System Kinetic Energy After Collision: 

Perfectly Elastic, Partially Inelastic/Elastic or Perfectly Inelastic? 



Total System Kinetic Energy Before Collision: 

Total System Kinetic Energy After Collision: 

Perfectly Elastic, Partially Inelastic/Elastic or Perfectly Inelastic? 

53. An object with a mass M and a velocity v has a momentum of 32 kg•m/s. An object with a mass of ...
54. An object with a mass M and a velocity v undergoes a collision and encounters a force of F for a time of t. The collision brings the object to a final rest position ...
55. Two carts are placed next to each other on a lowfriction track. The carts are equipped with a springloaded mechanism which allows them to impart an impulse to each other. Cart A has a mass of M and Cart B has a mass of M. The springloaded mechanism is engaged and then released. The impulse causes Cart A to be propelled forward with a velocity of 40 cm/s.
56. A cart with a mass of M is moving along a lowfriction track with a speed of 60 cm/s. A brick is gently dropped from rest upon the cart. After the collision the cart and brick move together.
57. A 0.53kg basketball hits a wall headon with a forward speed of 18 m/s. It rebounds with a speed of 13.5 m/s. The contact time is 0.10 seconds. (a) determine the impulse with the wall, (b) determine the force of the wall on the ball.
58. A 4.0kg object has a forward momentum of 20 kg•m/s. A 60 N•s impulse acts upon it in the direction of motion for 5.0 seconds. A resistive force of 6.0 N then impedes its motion for 8.0 seconds. Determine the final velocity of the object.
59. A 3.0kg object is moving forward with a speed of 6.0 m/s. The object then encounters a force of 2.5 N for 8.0 seconds in the direction of its motion. The object then collides headon with a wall and heads in the opposite direction with a speed of 5.0 m/s. Determine the impulse delivered by the wall to the object.
60. A 46gram tennis ball is launched from a 1.35kg homemade cannon. If the cannon recoils with a speed of 2.1 m/s, determine the muzzle speed of the tennis ball.
61. A 2.0kg box is attached by a string to a 5.0kg box. A compressed spring is placed between them. The two boxes are initially at rest on a frictionfree track. The string is cut and the spring applies an impulse to both boxes, setting them in motion. The 2.0kg box is propelled backwards and moves 1.2 meters to the end of the track in 0.50 seconds. Determine the time it takes the 5.0kg box to move 0.90 meters to the opposite end of the track.
62. Two children are playing with a large snowball while on ice skates on a frozen pond. The 33kg child tosses the 5.0kg snowball, imparting a horizontal speed of 5.0 m/s to it. The 33kg child is 4.0 meters from a 28kg child and 8.0 meters from the edge of the pond (located behind him). Assuming negligible friction, how much time elapses between when the 28kg child gets hit by the snowball and when the 33kg child reaches the edge of the pond?
63. A 2.8kg physics cart is moving forward with a speed of 45 cm/s. A 1.9kg brick is dropped from rest and lands on the cart. The cart and brick move together across the horizontal surface. Assume an isolated system.
a. Determine the postcollision speed of the cart and the brick.b. Determine the momentum change of the cart.
c. Determine the momentum change of the brick.
d. Determine the net impulse upon the cart.
e. Determine the net impulse upon the system of cart and brick.
64. In a physics lab, a 0.500kg cart moving at 36.4 cm/s collides inelastically with a second cart which is initially at rest. The two carts move together with a speed of 21.8 cm/s after the collision. Determine the mass of the second cart.
65. A 9230kg truck collides head on with a 1250kg parked car. The vehicles entangle together and slide a linear distance of 10.6 meters before coming to rest. Assuming a uniform coefficient of friction of 0.820 between the road surface and the vehicles, determine the precollision speed of the truck.
66. A classic physics demonstration involves firing a bullet into a block of wood suspended by strings from the ceiling. The height to which the wood rises below its lowest position is mathematically related to the precollision speed of the bullet. If a 9.7gram bullet is fired into the center of a 1.1kg block of wood and it rises upward a distance of 33 cm, then what was the precollision speed of the bullet?
67. At an amusement park, twin brothers Tubby (m = 50 kg) and Chubby (m = 62 kg) occupy separate 36kg bumper cars. Tubby gets his car cruising at 3.6 m/s and collides headon with Chubby who is moving the opposite direction at 1.6 m/s. After the collision, Tubby bounces backwards at 0.5 m/s. Assuming an isolated system, determine ...
a. ... Chubby's postcollision speed.b. ... the percentage of original kinetic energy which is lost as the result of the collision.
68. Two billiard balls, assumed to have identical mass, collide in a perfectly elastic collision. Ball A is heading East at 12 m/s. Ball B is moving West at 8 m/s. Determine the postcollision velocities of Ball A and Ball B.
69. A 1.72kg block of soft wood is suspended by two strings from the ceiling. The wood is free to rotate in pendulumlike fashion when a force is exerted upon it. A 8.50g bullet is fired into the wood. The bullet enters the wood at 431 m/s and exits the opposite side shortly thereafter. If the wood rises to a height of 13.8 cm, then what is the exit speed of the bullet?
70. In a physics lab, the pitching speed of a student is determined by throwing a baseball into a box and observing the box's motion after the catch. A measurement of the the distance the box slides across a rough surface of known coefficient of friction will allow one to determine the preimpact speed of the pitched ball. If a 0.256kg ball hits a 3.46kg box and the ball and box slide a distance of 2.89 meters across a surface with a coefficient of friction of 0.419, then what is the preimpact speed of the pitched ball?
71. Two ice skaters collide on the ice. A 39.6kg skater moving South at 6.21 m/s collides with a 52.1kg skater moving East at 4.33 m/s. The two skaters entangle and move together across the ice. Determine the magnitude and direction of their postcollision velocity.
72. In a physics lab, two carts collide elastically on a level, lowfriction track. Cart A has a mass of 1.500 kg and is moving east at 36.5 cm/s. Cart B has a mass of 0.500 kg and is moving West at 42.8 cm/s. Determine the postcollision velocities of the two carts.
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Last update: 5/6/02