AP Physics Momentum Practice Test. Answers: A,E,E,A,E,B,D,C,B,A,B,E,D,C 16.(a)5450,5650 (b)2.25e7 (c)3 (d)1.5e7 17.(a)9 (b)2 (c)1.5 (d) (e).

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1 AP Physics Momentum Practice Test Answers: A,E,E,A,E,B,D,C,B,A,B,E,D,C 16.(a)5450,5650 (b).5e7 (c)3 (d)1.5e7 17.(a)9 (b) (c)1.5 (d)-4.75 (e).65 For multiple choice ( points) write the CAPITAL letter of the best response in the space provided. For the other problems, use the space provided, box in your final answer and show all of your work. Use 9.8 m/s for the acceleration due to gravity. 1. A new car bumper design is designed to extend the time of impact by 3 times. This reduces the force of impact by A. about three times. B. more than three times. C. about nine times. D. about 1.5 times. E. about 1.7 times.. A soldier fires a machine gun that shoots 10g bullets at a rate of 10 per second and a speed of 550 m/s. What is the average force of the gun on the soldier? A. 5.5 N. B. 0.3 N. C. 1.6 N. D. 110 N. E N. 3. An object having an initial momentum that may be represented by the vector above strikes an object that is initially at rest. Which of the following sets of vectors may represent the momenta of the two objects after the collision? (A) (B) (C) (D) (E) 4. A Hot-Wheels TM car rolls. m to a stop in 1.1 s. Its initial speed was A. 4.0 m/s. B. 1.0 m/s. C..0 m/s. D. 0.5 m/s. E. 1. m/s. 1

2 5. A 10.0 gram bullet traveling horizontally strikes and sticks in a 80 gram stationary airtrack glider. If the combined bullet/glider moves at 0.0 m/s the bullet's pre-impact velocity is A. 0.0 m/s. B..5 m/s. C m/s. D m/s. E m/s. 6. Two particles of equal mass m o, moving with equal speeds v O along paths inclined at 60 to the x-axis as shown below, collide and stick together. Their velocity after the collision has magnitude (A) 4 (B) (C) (D) 3 (E) v o 7.A 00 kg Corvette crashes into a brick wall with a speed of 0 m/s. If it comes to a stop in 0.1 seconds the average force acting on it is A Newtons. B Newtons. C Newtons. D. 440,000. Newtons. E. 00,000 Newtons. 8. The graph below shows the force on an object of mass M as a function of time. For the time interval 0 to 4 s, the total change in the momentum of the object is (A) 40 kg m/s (B) 0 kg m/s (C) 0 kg m/s (D) -0 kg m/s (E) indeterminable unless the mass M of the object is known 9.A 5 kg skateboarder runs at 6.0 m/s and jumps onto a 4 kg stationary skateboard. Her initial speed on the skateboard is A. 5.8 m/s B. 5. m/s C. 4.3 m/s D. 4.7 m/s E. 3.1 m/s. 10. If one knows only the constant resultant force acting on an object and the time during which this force acts, one can determine the A. change in momentum of the object B. change in velocity of the object C. change in kinetic energy of the object D. mass of the object E. acceleration of the object

3 11. A 0.5 kg stationary ball receives a 18 N. s upward vertical impulse at ground level. The ball's maximum height is A. 4.1 m. B m. C m. D m. E m. 1. A 0.05 kg bullet collides and sticks to a.5 kg stationary block suspended from a string. The bullet and block swings to a maximum height of 1 cm. What was the initial speed of the bullet? A. 38 m/s. B. 48 m/s. C. 58 m/s. D. 68 m/s. E. 78 m/s. Use the following information for the next problems: A 4000 kg Mack truck travels 35 o north of west at 0 m/s. A 900 kg Honda travels 5 o west of south at 30 m/s. They collide and stick together. N 35 O E 5 O 14. The speed of the truck/honda mess just after the collision is A m/s. B. 1.3 m/s. C..5 m/s. D m/s. E m/s. 15. The direction of the truck/honda mess, measured counter-clockwise from the +X axis, just after the collision is A O B O C O D O E O 3

4 16. (10 Points) A rocket and payload are moving through space with a constant velocity of 5500 m/s relative to the Earth as shown below. The mass of the rocket is 4500 kg and the mass of the payload is 1500 kg. The rocket and payload are then separated by a spring that pushes them apart so that they have a relative velocity of 00 m/s. (a) What are the velocities of the rocket and payload relative to the earth after separation? (b) What is the change in kinetic energy before and after the separation? (c) The spring that separated the rocket and payload has a spring constant of 5.0 x 10 6 N/m. How much was the spring compressed before separation? (d) What was the maximum force of the spring on the rocket? 4

5 17. (10 Points) Block A with a mass of kg, moving to the right on a frictionless table at 6 m/s, has a head-on collision with Block B which is at rest and has a mass of 4.5 kg, as shown below. (a) The graph below shows the force of block A on block B during the collision. What is the impulse applied to block B? (b) What is the speed and direction of block B just after the collision? (c) What is the speed and direction of block A just after the collision? (d) What is the change in the kinetic energy of the blocks as a result of the collision? Was the collision elastic? (e) After the collision the blocks slide off the table and land on the floor. What is the distance between the landing points of each block? 5

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