1. A baseball player throws a ball horizontally. Which statement best describes the ball's motion after it is thrown? [Neglect the effect of
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1 1. A baseball player throws a ball horizontally. Which statement best describes the ball's motion after it is thrown? [Neglect the effect of friction.] A) Its vertical speed remains the same, and its horizontal speed increases. B) Its vertical speed remains the same, and its horizontal speed remains the same. C) Its vertical speed increases, and its horizontal speed increases. D) Its vertical speed increases, and its horizontal speed remains the same. 2. A 0.2-kilogram red ball is thrown horizontally at a speed of 4 meters per second from a height of 3 meters. A 0.4-kilogram green ball is thrown horizontally from the same height at a speed of 8 meters per second. Compared to the time it takes the red ball to reach the ground, the time it takes the green ball to reach the ground is A) one-half as great B) twice as great C) the same D) four times as great
2 3. A ball is projected horizontally to the right from a height of 50. meters, as shown in the diagram below. Which diagram best represents the position of the ball at 1.0-second intervals? [Neglect air resistance.] A) B) C) D)
3 4. Base your answer to the following question on the diagram below which shows a ball projected horizontally with an initial velocity of 20. meters per second east, off a cliff 100. meters high. [Neglect air resistance.] 6. Base your answer to the following question on the information and diagram below. A 60.-kilogram adult and a 30.-kilogram child are passengers on a rotor ride at an amusement park. When the rotating hollow cylinder reaches a certain constant speed, v, the floor moves downward. Both passengers stay "pinned" against the wall of the rotor, as shown in the diagram below. During the flight of the ball, what is the direction of its acceleration? A) downward B) upward C) westward D) eastward 5. A projectile is launched at an angle above the ground. The horizontal component of the projectile's velocity. vx, is initially 40. meters per second. The vertical component of the projectile's velocity, vy, is initially 30. meters per second. What are the components of the projectile's velocity after 2.0 seconds of flight? [Neglect friction.] A) vx = 40. m/s and vy = 10. m/s B) vx = 40. m/s and vy = 30. m/s C) vx = 20. m/s and vy = 10. m/s D) vx = 20. m/s and vy = 30. m/s Compared to the magnitude of the acceleration of the adult, the magnitude of the acceleration of the child is A) less B) greater C) the same
4 Base your answers to questions 7 and 8 on the diagram below which represents a ball of mass M attached to a string. The ball moves at a constant speed around a flat horizontal circle of radius R. 10. Base your answer to the following question on the following information. The diagram shows a 5.0-kilogram cart traveling clockwise in a horizontal circle of radius 2.0 meters at a constant speed of 4.0 meters per second. 7. If the string is shortened while the speed of the ball remains the same, the centripetal acceleration will A) decrease B) increase C) remain the same 8. If the velocity of the ball is doubled, the centripetal acceleration A) is halved B) is doubled C) remains the same D) is quadrupled What is the magnitude of the centripetal force acting on the cart? A) 8.0 N B) 20. N C) 40. N D) 50. N 11. The diagram below represents a mass, m, being swung clockwise at constant speed in a horizontal circle. 9. A car rounds a horizontal curve of constant radius at a constant speed. Which diagram best represents the directions of both the car s velocity, v, and acceleration, a? A) B) C) D) At the instant shown, the centripetal force acting on mass m is directed toward point A) A B) B C) C D) D 12. As a cart travels around a horizontal circular track, the cart must undergo a change in A) velocity B) inertia C) speed D) weight
5 13. A car travels between the 100.-meter and 250.-meter highway markers in 10. seconds. The average speed of the car during this interval is A) 10. m/s B) 15 m/s C) 25 m/s D) 35 m/s 14. A roller coaster, traveling with an initial speed of 15 meters per second, decelerates uniformly at 7.0 meters per second 2 to a full stop. Approximately how far does the roller coaster travel during its deceleration? A) 1.0 m B) 2.0 m C) 16 m D) 32 m 15. Oil drips at 0.4-second intervals from a car that has an oil leak. Which pattern best represents the spacing of oil drops as the car accelerates uniformly from rest? A) B) C) D) 16. A locomotive starts from rest and accelerates at 0.12 meter per second 2 to a speed of 2.4 meters per second in 20. seconds. This motion could best be described as A) constant acceleration and constant velocity B) increasing acceleration and constant velocity C) constant acceleration and increasing velocity D) increasing acceleration and increasing velocity 17. Which graph best represents the motion of a freely falling body near the Earth's surface? A) B) C) D) 18. A ball is thrown straight downward with a speed of 0.50 meter per second from a height of 4.0 meters. What is the speed of the ball 0.70 second after it is released? [Neglect friction.] A) 0.50 m/s B) 7.4 m/s C) 9.8 m/s D) 15 m/s 19. A ball dropped from rest falls freely until it hits the ground with a speed of 20 meters per second. The time during which the ball is in free fall is approximately A) 1 s B) 2 s C) 0.5 s D) 10 s 20. Which object has the greatest inertia? A) a kg bullet traveling at 90. m/s B) a 30.-kg child traveling at 10. m/s on her bike C) a 490-kg elephant walking with a speed of 1.0 m/s D) a 1500-kg car at rest in a parking lot 21. Three forces act on a box on an inclined plane as shown in the diagram below. [Vectors are not drawn to scale.] If the box is at rest, the net force acting on it is equal to A) the weight B) the normal force C) friction D) zero
6 22. Two forces, F1 and F2, are applied to a block on a frictionless, horizontal surface as shown below. If the magnitude of the block's acceleration is 2.0 meters per second 2, what is the mass of the block? A) 1 kg B) 5 kg C) 6 kg D) 7 kg 23. A carpenter hits a nail with a hammer. Compared to the magnitude of the force the hammer exerts on the nail, the magnitude of the force the nail exerts on the hammer during contact is A) less B) greater C) the same 24. A car s performance is tested on various horizontal road surfaces. The brakes are applied, causing the rubber tires of the car to slide along the road without rolling. The tires encounter the greatest force of friction to stop the car on A) dry concrete B) dry asphalt C) wet concrete D) wet asphalt 25. A box is pushed toward the right across a classroom floor. The force of friction on the box is directed toward the A) left B) right C) ceiling D) floor 26. A 60.-kilogram physics student would weigh 1560 newtons on the surface of planet X. What is the magnitude of the acceleration due to gravity on the surface of planet X? A) m/s 2 B) 6.1 m/s 2 C) 9.8 m/s 2 D) 26 m/s 2
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