1. Review Game Chapters 7, 8 & 9

2. Multiple Choice 1 Which of the following statements is correct? a.The farther the force is from the axis of rotation, the more torque is produced. b.The closer the force is to the axis of rotation, the more torque is produced. c.The closer the force is to the axis of rotation, the easier it is to rotate the object. d.The farther the force is from the axis of rotation, the less torque is produced. A

3. Multiple Choice 2 Paint is splattered on a canvas. After the paint sticks to the canvas, the total momentum of the paint and canvas a. is zero.c. is equal and opposite. b. increases.d. decreases. A

4. Multiple Choice 3 The relationship between linear acceleration and angular acceleration is given by: a. v = d/t c. v = r  b. a = r  d. d = r  B

5. Multiple Choice 4 As you get farther from the center of Earth, your weight will ____. a. decreasec. remain the same b. increased. can't tell from information given A

6. Multiple Choice 5 Which of the following has the greatest momentum? a.truck with a mass of 2250 kg moving at a velocity of 25 m/s b.car with a mass of 1210 kg moving at a velocity of 51 m/s c.truck with a mass of 6120 kg moving at a velocity of 10 m/s d.car with a mass of 1540 kg moving at a velocity of 38 m/s B

7. Multiple Choice 6 A child with a mass of 23 kg rides a bike with a mass of 5.5 kg at a velocity of 4.5 m/s to the south. Compare the momentum of the child with the momentum of the bike. a.Both the child and the bike have the same momentum. b.The bike has a greater momentum than the child. c.The child has a greater momentum than the bike. d.Neither the child nor the bike has momentum. C

8. Multiple Choice 7 If a force is exerted on an object, which statement is true? a.A large force always produces a large change in the object’s momentum. b.A large force produces a large change in the object’s momentum only if the force is applied over a very short time interval. c.A small force applied over a long time interval can produce a large change in the object’s momentum. d.A small force produces a large change in the object’s momentum. C

9. Multiple Choice 8 A force is applied to stop a moving shopping cart. Increasing the time interval over which the force is applied a. requires a greater force. b. has no effect on the force needed. c.requires a smaller force. d.requires the same force. C

10. Multiple Choice 9 Which of the following situations is an example of a visible change in momentum? a. A hiker walks through a spider’s web. b. A car drives over a pebble. c.A volleyball hits a mosquito in the air. d.A baseball is hit by a bat. D

11. Multiple Choice 10 Which conditions will result in the smallest change in momentum? a.a large force over a long time period b. a large force over a short time period c.a small force over a long time period d.a small force over a short time period D

12. Question 1 What is the momentum of a 13.0 g bullet moving with a velocity of 320 m/s to the right? 4.16 kg  m/s to the right

13. Question 2 A basketball has a diameter of 24.1 cm and mass of 0.60 kg. It rolls 18 m down the court. What is the angular displacement? 149 rad

14. Question 3 A bolt is to be tightened with a torque of 7.2 N  m. If you have a wrench that is 0.30 m long, what is the least amount of force you must exert? 24 N

15. Question 4 What is the momentum of a 72 kg running with a velocity of 6 m/s southwest? 432 kg  m/s southwest

16. Question 5 What is the speed of a satellite that is in orbit 260 km above Mercury’s surface. m M = 3.30 x 10 23 kg r M = 2.44 x 10 6 m 2855 m/s

17. Question 6 A 67 kg ice skater moving to the right with a velocity of 2.27 m/s throws a 0.15 kg snowball to the right with a velocity of 20 m/s. What is the velocity of the ice skater after throwing the snowball. Disregard friction. 2.23 m/s to the right

18. Question 7 A 0.14 kg baseball moving at +22.6 m/s is slowed to a stop by a catcher who exerts a constant force of -373 N. How long does it take this force to stop the ball? 0.00848 s

19. Question 8 Two balls have their centers 2.0 m apart. What is the gravitational force between them? (m 1 =8.1 kg, m 2 =6.0 kg) 8.10e-10 N

20. Question 9 A tire has a radius of 55 cm and a velocity of 17 m/s. What is the angular velocity of the tire? 30.9 rad/s

21. Question 10 Compute the gravitational force the Sun exerts on Jupiter. m J = 1.90 x 10 27 kg r J = 7.78 x 10 11 m 4.17x 10 23 N 4.17x 10 23 N

22. Question 11 A football punter accelerates a 0.60 kg football from rest to a speed of 6.3 m/s in 0.21 s, what constant force does the punter exert on the ball? 18 N upward

23. Question 12 A 1.28 kg skateboard is moving at a speed of 5.58 m/s when a 0.80 kg cat drops from a tree onto the skateboard. What is the speed of the skateboard-cat combination? 3.43 m/s

24. Question 13 What is the torque on a bolt produced by a 15 N force exerted perpendicular to a wrench that is 28 cm long? 4.2 N  m

25. Question 14 What happens to the gravitational force between two masses when the distance between the masses is doubled? Force is quartered

26. Question 15 The moon has a period of 27.3 days and a mean distance of 3.90 x 10 5 km from the center of Earth. Using this data predict the mean distance from Earth’s center for an artificial satellite that has a period of 4.80 days? 1.22 x 10 5 km

27. Question 16 Two carts with masses of 4.30 kg and 2.94 kg move toward each other on a frictionless track with speeds of 5.42 m/s and 3.12 m/s respectively. The carts stick together after colliding head-on. Find the final speed. 1.95 m/s