2. PREVIOUS QUIT NEXT START SLIDE Quiz by Dr. John Dayton Physics Quiz MOMENTUM Each question is multiple choice. Select the best response to the question by pressing the button to the left of your choice. If your answer is correct, you will hear an applause. Use the forward and backward buttons at the lower corners of the slides to advance questions. Background picture taken from: http://www.hanfordonline.co.uk/povray/content/scenes/newton/newton.jpg

3. PREVIOUS QUIT NEXT START SLIDE Quiz by Dr. John Dayton 1. What type of quantity is momentum? C. matrix D. vector A. scalar B. tensor

4. PREVIOUS QUIT NEXT START SLIDE Quiz by Dr. John Dayton 2. What are the SI units for momentum? C. kg. m D. N. s 2 A. kg. m/s B. kg. m/s 2

5. PREVIOUS QUIT NEXT START SLIDE Quiz by Dr. John Dayton 3. Which equation below correctly computes momentum? C. D. A. B.

6. PREVIOUS QUIT NEXT START SLIDE Quiz by Dr. John Dayton 4. The net change in an object`s momentum is called _______. C. force D. torque A. work B. impulse

7. PREVIOUS QUIT NEXT START SLIDE Quiz by Dr. John Dayton 5. What is the magnitude of an object`s momentum if the object`s mass is 5.0 kg and its speed is 6.0 m/s? C. 15 kg·m/s D. 30 kg·m/s A. 90 kg·m/s B. 180 kg·m/s

8. PREVIOUS QUIT NEXT START SLIDE Quiz by Dr. John Dayton 6. If an object`s initial momentum is +20 kg·m/s and its final momentum after 2 seconds is -20 kg·m/s, what average force acted upon it? C. 10 N D. -80 N A. -20 N B. 20 N

9. PREVIOUS QUIT NEXT START SLIDE Quiz by Dr. John Dayton 7. Impulse may be understood as __________. C. the area under a Momentum vs Time graph. D. the area under a Force vs Time graph. A. the slope of the tangent to the graph of Force vs Time at any time t. B. the area under a Force vs Velocity graph.

10. PREVIOUS QUIT NEXT START SLIDE Quiz by Dr. John Dayton 8. When is the momentum of a single object conserved? C. Momentum can only be conserved if the object is interacting with another object. D. The momentum of a single object can never be conserved. A. Momentum is always conserved. B. Momentum is conserved when the net force acting on the object is zero.

11. PREVIOUS QUIT NEXT START SLIDE Quiz by Dr. John Dayton 9. When is the total momentum of a system of interacting objects conserved? C. The total momentum is conserved when there are no internal forces. D. The total momentum of a system can not be conserved it the objects are interacting. A. The total momentum of a system is conserved when the net external force acting on the system is zero. B. The total momentum of a system is conserved when the internal forces add up to zero.

12. PREVIOUS QUIT NEXT START SLIDE Quiz by Dr. John Dayton 10. Suppose objects A and B are interacting and due to this interaction object A experience a change in momentum of  p. What is the change in momentum experienced by object B? C. -  p D. -2  p A.  p B. 2  p

13. PREVIOUS QUIT NEXT START SLIDE Quiz by Dr. John Dayton 11. While driving 60 mph on the highway a bug flying in the opposite direction splats on the windshield right in front of you. Which experienced the greater change in momentum, your car or the bug? C. The bug because of its greater change in velocity. D. The bug because it changed directions. A. Both the same but in opposite directions. B. The bug because of its smaller mass.

14. PREVIOUS QUIT NEXT START SLIDE Quiz by Dr. John Dayton 12. A collision involving objects that stick together is called ______. C. a partially elastic collision D. a head-on collision A. an elastic collision B. a perfectly inelastic collision

15. PREVIOUS QUIT NEXT START SLIDE Quiz by Dr. John Dayton 13. What is an elastic collision? C. In an elastic collision momentum is not conserved. D. In an elastic collision the colliding masses exchange velocities. A. An elastic collision conserves kinetic energy. B. In an elastic collision the objects stick together.

16. PREVIOUS QUIT NEXT START SLIDE Quiz by Dr. John Dayton 15. What factors cause injury during a car crash? C. 2 and 3 above D. 1 and 2 above A. 1 and 3 above B. 2 and 4 above 1. short stopping distance2. short stopping time 3. large area of contact4. staying in your seat

17. PREVIOUS QUIT NEXT START SLIDE Quiz by Dr. John Dayton 15. What is true about the conservation of momentum during a collision that takes place in two dimensions? C. The change in momentum in the x-direction is equal to the change in momentum in the y-direction. D. The initial momentum in the x-direction must be equal to the final momentum in the y-direction. A. The change in momentum in the x-direction is equal and opposite to the change in momentum in the y-direction. B. Momenta in the x-direction and in the y-direction are both conserved independently.

18. PREVIOUS QUIT NEXT START SLIDE Quiz by Dr. John Dayton This is the last question of this quiz. 16. Suppose you are stranded on a frozen lake where the ice is too slippery to walk. All you have is a bag of gold coins. How can you get off the ice before freezing to death? C. Throw the coins in the direction opposite from which you wish to slide. Conservation of momentum will do the rest. D. Give up, count your money, and die. A. Lay the gold coins on the ice and hope the sun heats them enough to melt the ice. (Do you foresee a problem doing this?) B. Use a coin as a signal mirror to attract attention. (Hope it`s not cloudy.)