# North Carolina Science Grade 7

## Chapter 12: Motion and Momentum

### Motion and Momentum

 1. The reason an object can transfer energy to another after a collision is because of the conservation of __________. Need a Hint? A) momentum B) matter C) speed D) energy 2. When something slows, its acceleration is __________. Need a Hint? A) negative B) constant C) instantaneous D) positive 3. What is the term for a change in velocity? Need a Hint? A) speed B) acceleration C) average speed D) instantaneous speed 4. When you graph speed, time is on the __________. Need a Hint? A) x-axis B) y-axis C) z-axis D) vertical axis 5. What is a measure of how hard it is to stop a moving object? Need a Hint? A) inertia B) acceleration C) momentum D) velocity 6. Something is in motion if it __________. Need a Hint? A) changes state B) changes properties C) changes distance D) changes position 7. What are the SI units for acceleration? Need a Hint? A) s/m2 B) m2/s C) m/s2 D) s2/m 8. The mathematical equation for momentum is __________. Need a Hint? A) momentum = mass x velocity B) momentum = velocity/mass C) momentum = weight x speed D) momentum = mass/velocity 9. When a negative acceleration is graphed, the line __________. Need a Hint? A) slopes upward B) slopes downward C) goes to zero D) remains constant 10. When a car goes around a curve at 20 mph, the __________ changes. Need a Hint? A) instantaneous speed B) speed C) velocity D) average speed 11. __________ is distance divided by time. Need a Hint? A) Speed B) Acceleration C) Velocity D) Displacement 12. In an inelastic collision between a moving object and a stationary object, the final velocity of both objects is __________. Need a Hint? A) zero B) the same as the original velocity of the moving object C) more than the original velocity of the moving object D) less than the original velocity of the moving object 13. Displacement measures the _________ between the starting and stopping points. Need a Hint? A) mass and volume B) distance and speed C) direction and speed D) distance and direction 14. During any collision, some energy is lost due to __________. Need a Hint? A) conservation B) momentum C) friction D) elasticity 15. On an acceleration graph in which the line is level, the acceleration is __________. Need a Hint? A) changing B) positive C) negative D) zero 16. What is the tendency for an object to resist change in its motion? Need a Hint? A) inertia B) momentum C) matter D) mass 17. To find acceleration, you first subtract __________ than divide by time. Need a Hint? A) final speed from initial speed B) initial speed from final speed C) final time from initial time D) velocity from distance 18. During a(n) __________ collision, objects bounce off each other. Need a Hint? A) solid B) elastic C) explosive D) inelastic 19. At the beginning of a track race, the instantaneous speed of all runners is __________. Need a Hint? A) different B) unable to be measured C) 0 m/s D) the average speed 20. When something accelerates then stops accelerating, what happens to the object? Need a Hint? A) stops completely B) goes faster C) continues to move at a constant velocity D) slows
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