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Phys 30 Practice Test Momentum 1. A 30 g object has 27 J of kinetic energy. Its momentum is ____ kg ⋅ m/s. Your 2-digit value is 2. A changing net force (as shown by the graph) acts on a mass, which is initially at rest on a level surface. If the final speed of the mass is 8.20 m/s, then the mass of the object is ________ kg. Your 3-digit value for the mass is : 3. A 2.60 × 10 −15 kg particle, moving forward at a speed of 30.0 km/s, experiences a backward impulse of 4.10 × 10 −10 N ⋅ s. The final speed of the object is a.bc × 10 d m/s. The values of a,b,c, and d are: 4. A 3500 kg vehicle is dropped to the ground and it lands with a speed of 6.00 m/s. If it bounces back up at a speed of 2.80 m/s and it was in contact with the ground for 700 milliseconds, then the magnitude of the average net force on the vehicle, in scientific notation, was a.bc × 10 d N. The values of a,b,c, and d are: 5. A 30.0 kg bomb is initially at rest. It then explodes into 3 pieces: Piece 1 : 10.0 kg piece moving with a momentum of 400 kg ⋅ m/s North Piece 2 : 13.0 kg piece moving with a momentum of 300 kg ⋅ m/s at 60.0° S of E. The magnitude of piece 3’s momentum after the explosion is a.bc × 10 d kg ⋅ m/s. Your values of a, b, c, and d are:

6. Which of the following is true? 7. The final speed of Object B is _________ m/s. Your 2-digit answer is 8. Which of the following best explains why rifles (with long barrels) tend to generate a higher muzzle velocity (of the bullet)? A. The longer barrel decreases the time of explosion and increases the force on the bullet. B. The longer barrel increases the time of explosion and increases the force on the bullet. C. The longer barrel decreases the time of explosion and increases the impulse on the bullet. D. The longer barrel increases the time of explosion and increases the impulse on the bullet. 9. Consider the head-on collision shown below:

Use the following information to answer the next 2 questions: A 75.0 kg boy is standing on a 8.00 kg skateboard at rest, and he is holding a 12.0 kg backpack. The boy then throws the backpack away at a speed of 29.0 m/s. 10. Which of the following is true? 11. The speed of the boy and the skateboard after he throws the skateboard is ________ m/s. Your 3-digit value is 12. An object with mass M and moving at a speed v collides head-on with another object with mass 3M that is at rest. If they stick together, then what is the final speed of the combined objects? Use the information below to answer the next 3 questions: A 500 kg car, travelling East at 14.0 m/s, collides with an 800 kg truck moving South at 11.0 m/s. After the collision, they stick together. 13. Which of the following best represents the momentum vector diagram for the collision? 14. The final speed of the truck and car after the collision is ___________ m/s. Your 3-digit value is

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15. The angle of the combined mass of the car and truck after the collision is ______ o E of S . Your 3 digit value is: Written Response : For the following collision between 2 balls, determine the velocity after the collision for the 5.0 kg ball. Answers: 1. 1.3 2. 33.5 3. 1285 4. 4404 5. 2052 6. C 7. 3.2 8. D 9. A 10. B 11. 4.19 12. C 13. D 14. 8.65 15. 38.5 o

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