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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 START NEXT PREVIOUS SLIDE Quiz by Dr. John Dayton QUIT 1. What type of quantity is momentum? A. scalar B. tensor C. matrix D. vector START NEXT PREVIOUS SLIDE Quiz by Dr. John Dayton QUIT 2. What are the SI units for momentum? A. kg.m/s B. kg.m/s2 C. kg.m D. N.s2 START NEXT PREVIOUS SLIDE Quiz by Dr. John Dayton QUIT 3. Which equation below correctly computes momentum? A. p mx B. p mx C. p mx D. p mv START NEXT PREVIOUS SLIDE Quiz by Dr. John Dayton QUIT 4. The net change in an object`s momentum is called _______ . A. work B. impulse C. force D. torque START NEXT PREVIOUS SLIDE Quiz by Dr. John Dayton QUIT 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? A. 90 kg·m/s B. 180 kg·m/s C. 15 kg·m/s D. 30 kg·m/s START NEXT PREVIOUS SLIDE Quiz by Dr. John Dayton QUIT 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? A. -20 N B. 20 N C. 10 N D. -80 N START NEXT PREVIOUS SLIDE Quiz by Dr. John Dayton QUIT 7. Impulse may be understood as __________ . 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. C. the area under a Momentum vs Time graph. D. the area under a Force vs Time graph. START NEXT PREVIOUS SLIDE Quiz by Dr. John Dayton QUIT 8. When is the momentum of a single object conserved? A. Momentum is always conserved. B. Momentum is conserved when the net force acting on the object is zero. 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. START NEXT PREVIOUS SLIDE Quiz by Dr. John Dayton QUIT 9. When is the total momentum of a system of interacting objects conserved? 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. 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. START NEXT PREVIOUS SLIDE Quiz by Dr. John Dayton QUIT 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? A. p B. 2p C. -p D. -2p START NEXT PREVIOUS SLIDE Quiz by Dr. John Dayton QUIT 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? A. Both the same but in opposite directions. B. The bug because of its smaller mass. C. The bug because of its greater change in velocity. D. The bug because it changed directions. START NEXT PREVIOUS SLIDE Quiz by Dr. John Dayton QUIT 12. A collision involving objects that stick together is called ______ . A. an elastic collision B. a perfectly inelastic collision C. a partially elastic collision D. a head-on collision START NEXT PREVIOUS SLIDE Quiz by Dr. John Dayton QUIT 13. What is an elastic collision? A. An elastic collision conserves kinetic energy. B. In an elastic collision the objects stick together. C. In an elastic collision momentum is not conserved. D. In an elastic collision the colliding masses exchange velocities. START NEXT PREVIOUS SLIDE Quiz by Dr. John Dayton QUIT 15. What factors cause injury during a car crash? 1. short stopping distance 2. short stopping time 3. large area of contact 4. staying in your seat A. 1 and 3 above B. 2 and 4 above C. 2 and 3 above D. 1 and 2 above START NEXT PREVIOUS SLIDE Quiz by Dr. John Dayton QUIT 15. What is true about the conservation of momentum during a collision that takes place in two dimensions? 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. 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. START NEXT PREVIOUS SLIDE Quiz by Dr. John Dayton QUIT 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? 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.) 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. START NEXT PREVIOUS SLIDE This is the last question of this quiz. Quiz by Dr. John Dayton QUIT