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Transcript
Motion and Forces Practice Test- PLEASE DO NOT WRITE ON THIS PACKET!! Section 1: DESCRIBING AND MEASURING MOTION. Use the distance vs time graph below to complete questions #1-5. 1. The slope on a distance-time graph shows the ________ of an object. A. Distance B. Acceleration C. Speed D. Force 2. Who won the race? A. Albert B. Bob C. Charlie D. They all tied 3. How far was the race? A. 12 meters B. 18 meters C. 50 meters D. 100 meters 4. How long did it take for Bob to finish the race? A. 12 seconds B. 12 m/s C. 14 seconds D. 14 m/s 5. What was Albert's average speed eight seconds into the race? A. 40 meters B. 8 m/s C. 5 m/s D. 5 m/s/s Use the speed vs time graph below to complete questions #6-8. 6. When was the bus increasing speed? A. O A B. B C C. D E D. Both O A and D E 7. When was the bus decelerating? A. A B B. E F C. B C D. Both O A and D E 8. When was the bus traveling at a constant speed? A. A B B. B C C. O A D. D E 9. Velocity is: A. Speed and direction B. Average acceleration C. Another word for deceleration D. Instantaneous speed Section 2: THE NATURE OF FORCE Matching the following terms to its definition. 10. Force 11. Newton 12. Net Force 13. Balanced Force 14. Unbalanced Force A. The unit used to measure a force. B. The sum of all of the forces acting on an object. C. Equal forces acting on an object in opposite directions. D. A push or pull exerted on an object. E. Forces that produce a nonzero net force, which changes an object's motion. Section 3: FRICTION AND GRAVITY Write the correct response on the line. 15. Which A. B. C. D. type of friction is the strongest? Static Rolling Sliding Fluid 16. What affects gravitational attraction between two objects? A. Mass B. Distance C. Friction D. Both A and B 17. On the A. B. C. D. 18. A football being thrown across a field is called a: A. Weight B. Projectile C. Centripetal Force D. Friction 19. A falling object reaches terminal velocity: A. When the force of air resistance equals the weight of the object. B. When it reaches its highest height. C. Only if it has a large mass. D. If no air resistance acts on the object. moon, a penny and a feather dropped from the same height will: Fall at different rates Fall at the same rate Float Not have momentum 20. A ball is dropped at the exact same time that another ball is shot. What best describes what will happen? A. B. C. D. 21. Which blader? A. B. C. D. The ball that is dropped will hit the ground first because it travels a shorter distance. The ball that was shot will hit the ground first because it has a greater terminal velocity. The two balls will hit the ground at the same time because gravity acts the same on both objects. A different scenario will occur each time. Air Resistance force is labeled INCORRECTLY on the force diagram of the roller Air resistance Friction Weight Normal Force Friction Weight Section 4: NEWTON'S THREE LAWS AND MOMENTUM Match the term with the definition. A. Depends on the mass and velocity of an object. B. 22. Newton's First Law of Motion 23. Newton's Second Law of Motion 24. Newton's Third Law of Motion 25. Momentum 26. Inertia A net force acting on an object causes the object to accelerate in the direction of the net force and is dependent upon the mass of the object. C. The tendency of an object to resist a change in motion. D. An object in motion will stay in motion and an object at rest will stay at rest unless acted upon by an unbalanced force. E. For every action force there is an equal and opposite reaction force. Normal Force CALCULATIONS: Complete the calculations below. Show all of your work on a separate piece of paper. 27. What is the momentum of a 760 kg car if it is traveling down the road at 65 m/s? 28. What amount of force is needed to accelerate a hockey puck at 56 m/s/s if the puck's mass is 3.2 kg? 29. What is the weight (in Newtons) of a person whose mass is 185 kg? 30. What is the acceleration of a car that slows down to 20 m/s from 40 m/s in 4.5 seconds?