# PHYSICS MIDTERM REVIEW

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1 1. The acceleration due to gravity on the surface of planet X is 19.6 m/s 2. If an object on the surface of this planet weighs 980. newtons, the mass of the object is 50.0 kg 490. N 100. kg 908 N 2. If a car is traveling at an average speed of 60 kilometers per hour, how long does it take to travel 12 kilometers? 0.2 hour 0.72 hour 0.5 hour 5.0 hours 7. Base your answer to the following question on the diagram below which represents a 10-kilogram object at rest at point A. The object accelerates uniformly from point A to point B in 4 seconds, attaining a maximum speed of 10 meters per second at point B. The object then moves up the incline. [Neglect friction.] 3. The average speed of a runner in a 400.-meter race is 8.0 meters per second. How long did it take the runner to complete the race? 80. sec 40. sec 50. sec 32. sec 4. A blinking light of constant period is situated on a lab cart. Which diagram best represents a photograph of the light as the cart moves with constant velocity? What distance did the object travel in moving from point A to point B? 2.5 m 20. m 10. m 100 m 8. A car moving at a speed of 8.0 meters per second enters a highway and accelerates at 3.0 meters per second 2. How fast will the car be moving after it has accelerated for 56 meters? 24 m/s 18 m/s 20. m/s 4.0 m/s 9. A jogger accelerates at a constant rate as she travels 5.0 meters along a straight track from point A to point B,as shown in the diagram below. 5. A car travels 20. meters east in 1.0 second. The displacement of the car at the end of this 1.0-second interval is 20. m 20. m east 20. m/s 20. m/s east 6. A baseball pitcher throws a fastball at 42 meters per second. If the batter is 18 meters from the pitcher, approximately how much time does it take for the ball to reach the batter? 1.9 s 0.86 s 2.3 s 0.43 s If her speed was 2.0 meters per second at point A and will be 3.0 meters per second at point B, how long will it take her to go from A to B? 1.0 s 3.3 s 2.0 s 4.2 s 10. A car accelerates uniformly from rest at 3.2 m/s 2. When the car has traveled a distance of 40. meters, its speed will be 8.0 m/s 16 m/s 12.5 m/s 128 m/s 11. A ball starting from rest accelerates uniformly at 5.0 meters per second 2 as it rolls 40. meters down an incline. How much time is required for the ball to roll the 40. meters? 2.8 s 16 s 8.0 s 4.0 s

2 12. Base your answer to the following question on the information and diagram below. An inclined plane is 10 meters long and is elevated 5 meters on one end as shown. Starting from rest at the top of the incline, a box weighing 100 Newtons accelerates down the incline at a rate of 2.5 meters per second A car having an initial speed of 16 meters per second is uniformly brought to rest in 4.0 seconds. How far does the car travel during this 4.0-second interval? 32 m 96 m 82 m 4.0 m 17. A truck with an initial speed of 12 meters per second accelerates uniformly at 2.0 meters per second 2 for 3.0 seconds. What is the total distance traveled by the truck during this 3.0-second interval? 9.0 m 36 m 25 m 45 m How many seconds will it take the box to reach the bottom of the incline? 2.8 sec. 4.6 sec. 2.0 sec. 4.0 sec. Base your answers to questions 13 and 14 on the information below: A 10.-kilogram object, starting from rest, slides down a frictionless incline with a constant acceleration of 2.0 m/sec 2 for four seconds. 13. During the 4.0 seconds, the object moves a total distance of 32 m 8.0 m 16 m 4.0 m 14. Which graph below best represents the relationship between acceleration (a) and time (t) for the object? 18. A cart moving across a level surface accelerates uniformly at 1.0 meter per second 2 for 2.0 seconds. What additional information is required to determine the distance traveled by the cart during this 2.0-second interval? coefficient of friction between the cart and the surface mass of the cart net force acting on the cart 4 initial velocity of the cart initial velocity of the cart 19. An airplane originally at rest on a runway accelerates uniformly at 6.0 meters per second 2 for 12 seconds. During this 12-second interval, the airplane travels a distance of approximately 72 m 430 m 220 m 860 m 20. A skier starting from rest skis straight down a slope 50. meters long in 5.0 seconds. What is the magnitude of the acceleration of the skier? 20. m/s m/s m/s m/s An object originally at rest is uniformly accelerated along a straight-line path to a speed of 8.0 meters per second in 2.0 seconds. What was the acceleration of the object? 0.25 m/s m/s 2 16 m/s m/s A boat initially traveling at 10. meters per second accelerates uniformly at the rate of 5.0 meters per second 2 for 10. seconds. How far does the boat travel during this time? 50. m 350 m 250 m 500 m 22. An object is uniformly accelerated from rest to a speed of 25 meters per second in 10 seconds. The acceleration of the object is 1.0 m/s m/s 2 l.5 m/s m/s A car is accelerated at 4.0 m/s 2 from rest. The car will reach a speed of 28 meters per second at the end of 3.5 sec 14 sec 7.0 sec 24 sec

3 24. If the mass of an object were doubled, its acceleration due to gravity would be halved unchanged doubled quadrupled 25. An object, initially at rest, falls freely near the Earth's surface. How long does it take the object to attain a speed of 98 meters per second? 0.1 sec 98 sec 10 sec 960 sec 32. The graph at the right represents the relationship between distance and time for an object in motion. During which interval is the speed of the object changing? AB CD BC DE 26. An object is allowed to fall freely near the surface of a planet. The object has an acceleration due to gravity of 24 m/s 2. How far will the object fall during the first second? 24 meters 9.8 meters 12 meters 4.9 meters 33. The graph below represents the relationship between distance and time for an object. 27. A softball is thrown straight up, reaching a maximum height of 20 meters. Neglecting air resistance, what is the ball's approximate vertical speed when it hits the ground? 10 m/sec 15 m/sec 20 m/sec 40 m/sec 28. A stone is dropped from a bridge 45 meters above the surface of a river. Approximately how many seconds does the stone take to reach the water's surface? 1.0 s 3.0 s 10. s 22 s 29. After a model rocket reached its maximum height, it then took 5.0 seconds to return to the launch site. What is the approximate maximum height reached by the rocket? [Neglect air resistance.] 49 m 120 m 98 m 250 m What is the instantaneous speed of the object at t = 5.0 seconds? 0 m/s 5.0 m/s 2.0 m/s 4.0 m/s 34. Base your answer to the following question on The displacement-time graph below represents the motion of a cart along a straight line. 30. An astronaut drops a hammer from 2.0 meters above the surface of the Moon. If the acceleration due to gravity on the Moon is 1.62 meters per second 2, how long will it take for the hammer to fall to the Moon s surface? 0.62 s 1.6 s 1.2 s 2.5 s 31. The graph below represents the motion of an object traveling in a straight line as a function of time. What is the average speed of the object during the first four seconds? During which interval was the cart accelerating? AB CD BC DE 1 m/s 0.5 m/s 2 m/s 0 m/s

4 35. The graph at the right represents the relationship between distance and time for an object moving in a straight line. According to the graph, the object is 39. Which two graphs best represent the motion of an object falling freely from rest near Earth's surface? motionless moving at a constant speed decelerating accelerating 36. The graph at the right represents the motion of a body that is moving with increasing acceleration increasing speed decreasing acceleration constant speed Base your answers to questions 37 and 38 on the graph below which represents the displacement of an object as a function of time. 40. The distance-time graph at the right represents the motion of a laboratory cart. According to this graph, the cart is slowing down speeding up not moving moving at a constant speed 37. What is the average velocity of the object from t = 0 to t = 3 seconds? 1.0 m/s 3.0 m/s 2.0 m/s 0 m/s 38. During which time interval is the object accelerating? 0-2 s 3-4 s 2-3 s 4-6 s 41. Which statement about the movement of an object with zero acceleration is true? The object must be at rest. The object must be slowing down. The object may be speeding up. The object may be in motion. 42. A rocket in space can travel without engine power at constant speed in the same direction. This condition is best explained by the concept of gravitation acceleration action-reaction inertia

5 43. A copper coin resting on a piece of cardboard is placed on a beaker as shown in the diagram below. When the cardboard is rapidly removed, the coin drops into the beaker. 46. Two forces are applied to a 2.0-kilogram block on a frictionless horizontal surface, as shown in the diagram below. The two properties of the coin which best explain its fall are its weight and its temperature volume electrical resistance inertia 44. A ball rolls through a hollow semicircular tube lying flat on a horizontal tabletop. Which diagram best shows the path of the ball after emerging from the tube, as viewed from above? The acceleration of the block is 1.5 m/s 2 to the right 2.5 m/s 2 to the left 2.5 m/s 2 to the right 4.0 m/s 2 to the left 47. What is an essential characteristic of an object in equilibrium? zero velocity zero potential energy zero acceleration zero kinetic energy 48. If the sum of all the forces acting on a moving object is zero, the object will slow down and stop change the direction of its motion accelerate uniformly continue moving with constant velocity 49. A man standing on a scale in an elevator notices that the scale reads 30 newtons greater than his normal weight. Which type of movement of the elevator could cause this greater-than-normal reading? accelerating upward accelerating downward moving upward at constant speed moving downward at constant speed 50. Three forces act on a box on an inclined plane as shown in the diagram below. [Vectors are not drawn to scale.] 45. Compared to 8 kilograms of feathers, 6 kilograms of lead has less mass and less inertia less mass and more inertia more mass and less inertia more mass and more inertia If the box is at rest, the net force acting on it is equal to the weight friction the normal force zero

6 51. As a constant unbalanced force acts on an object in the direction of motion, the object's speed decreases remains the same increases 52. A man weighing 800 Newtons is standing in an elevator. If the elevator rises with an acceleration of 9.8 meters per second 2, the force exerted by the elevator on the man will be 400 N 1600 N 800 N 2000 N 53. When an unbalanced force of 10. Newtons is applied to an object whose mass is 4.0 kilograms, the acceleration of the object will be 40. m/s m/s m/s m/s If the net force acting on an object is doubled, the acceleration of the object is halved unchanged doubled quadrupled 59. An 800-newton person is standing in an elevator. If the upward force of the elevator on the person is 600 Newtons, the person is at rest accelerating upward accelerating downward moving downward at constant speed 60. An object with a mass of 0.5 kilogram starts from rest and achieves a maximum speed of 20 meters per second in 0.01 second. What average unbalanced force accelerates this object? 1,000 N 0.1 N 10 N N 61. In the graph below, the acceleration of an object is plotted against the unbalanced force on the object. Base your answers to questions 55 and 56 on the diagram below which represents a 3.0-kilogram mass being moved at a constant speed by a force of 6.0 Newtons. 55. If the surface were frictionless, the 6.0-newton force would produce an acceleration of 0.33 m/s 2 2 m/s 2 6 m/s 2 18 m/s The magnitude of the force of friction acting on the mass is 0 N 3 N 1.8 N 6 N What is the object's mass? 1 kg 0.5 kg 2 kg 0.2 kg 62. A student weighing 500. Newtons stands on a spring scale in an elevator. If the scale reads 520. Newtons, the elevator must be accelerating upward accelerating downward moving upward at constant speed moving downward at constant speed 63. Two forces are applied to a 2.0-kilogram block on a frictionless horizontal surface, as shown in the diagram below. 57. An unbalanced force of 10.0 Newtons causes an object to accelerate at 2.0 m/s 2. What is the mass of the object? 0.2 kg 8.0 kg 5.0 kg 20 kg 58. An unbalanced force of 10 Newtons acts on a 20-kilogram mass for 5 seconds. The acceleration of the mass is 0.5 m/s 2 2 m/s 2 40 m/s m/s 2 The acceleration of the block is 5.0 m/s 2 to the right 5.0 m/s 2 to the left 3.0 m/s 2 to the right 3.0 m/s 2 to the left

7 64. A horizontal force is used to pull a 5.0-kilogram cart at a constant speed of 5.0 meters per second across the floor, as shown in the diagram below. 67. Two carts, A and B. are joined by a compressed spring as shown in the diagram below. The mass of cart A is twice that of cart B. Which of the following statements is true about their change in velocity when the spring is released? If the force of friction between the cart and the floor is 10. Newtons, the magnitude of the horizontal force along the handle of the cart is 5.0 N 25 N 10. N 50. N 65. A 1.0-kilogram block is placed on each of four frictionless planes inclined at different angles. On which inclined plane will the acceleration of the block be greatest? 66. Which mass would have the greatest acceleration if the same unbalanced force was applied to each? 1 kg 3 kg 2 kg 4 kg A will have the greater change in velocity. B will have the greater change in velocity. Both carts will have the same change in velocity. Neither cart will experience a change in velocity. 68. A 30-kilogram boy exerts a force of 100 Newtons on a 50- kilogram object. The force that the object exerts on the boy is 0 N 980 N 100 N 1,500 N 69. A 1-kilogram object rests on a horizontal table top. The force that the table top exerts on the object is 1 N 0 N 2 N 9.8 N 70. In a baseball game, a batter hits a ball for a home run. Compared to the magnitude of the force imparted to the ball, the magnitude of the force imparted to the bat is less the same greater 71. A mosquito flying over a highway strikes the windshield of a moving truck. Compared to the magnitude of the force of the truck on the mosquito during the collision, the magnitude of the force of the mosquito on the truck is smaller the same larger 72. A 400-newton girl standing on a dock exerts a force of 100 newtons on a newton sailboat as she pushes it away from the dock. How much force does the sailboat exert on the girl? 25 N 400 N 100 N N 73. What is the weight of a 5.0-kilogram object at the surface of the Earth? 5.0 kg 49 N 25 N 49 kg 74. A 50-kilogram student, standing on the Earth, attracts the Earth with a force closest to 0 N 50 N 5 N 500 N

8 75. On the surface of planet X, the acceleration due to gravity is 16 m/s 2. What is the weight of a 6.0-kilogram mass located on the surface of planet X? 2.7 N 96 N 59 N 940 N 81. Block A is pulled with constant velocity up an incline as shown in the diagram below. 76. An object starts from rest and accelerates uniformly down an incline. If the object reaches a speed of 40 meters per second in 5 seconds, its average speed is 8 m/sec 20 m/sec 10 m/sec 30 m/sec 77. In order to keep an object weighing 20 Newtons moving at constant speed along a horizontal surface, a force of 10 Newtons is required. The force of friction between the surface and the object is 0 N 20 N 10 N 30 N 78. A constant unbalanced force of friction acts on a kilogram mass moving along a horizontal surface at 10.0 meters per second. If the mass is brought to rest in 1.50 seconds, what is the magnitude of the force of friction? 10.0 N 147 N 100 N 150. N 79. The diagram below represents a box shown sliding down an inclined plane. Toward which point will the force of friction on the box be directed? A box initially at rest on a level floor is being acted upon by a variable horizontal force, as shown in the diagram at the right. Compared to the force required to start the box moving, the force required to keep it moving at constant speed is Which arrow best represents the direction of the force of friction acting on block A? 82. Sand is often placed on an icy road because the sand decreases the coefficient of friction between the tires of a car and the road increases the coefficient of friction between the tires of a car and the road decreases the gravitational force on a car increases the normal force of a car on the road 83. A wooden block is at rest on a horizontal steel surface. If a 10.-Newton force applied parallel to the surface is required to set the block in motion, how much force is required to keep the block moving at constant velocity? less than 10. N 10. N greater than 10. N 84. A 50.-Newton horizontal force is needed to keep an object weighing 500. Newtons moving at a constant velocity of 2.0 meters per second across a horizontal surface. The magnitude of the frictional force acting on the object is 500. N 50. N 450. N 0 N less the same greater

9 85. A different force is applied to each of four 1-kilogram blocks to slide them across a uniform steel surface at constant speed as shown below. In which diagram is the coefficient of friction between the block and steel smallest? 88. The diagram below shows a granite block being slid at constant speed across a horizontal concrete floor by a force parallel to the floor. 86. Jill is pulling a 200. Newton sled through the snow at constant velocity using a horizontal force of 10. Newtons. What is the kinetic coefficient of friction of the sled on the snow? The table below lists the coefficients of kinetic friction for four materials sliding over steel. Which pair of quantities could be used to determine the coefficient of friction for the granite on the concrete? mass and speed of the block mass and normal force on the block frictional force and speed of the block frictional force and normal force on the block 89. What is the range of a projectile launched near Earth with an initial velocity of 27 m/s at an angle of 60 degrees? (rounded to the nearest meter) What is the maximum height of a projectile launched near Earth at an angle of 60 degrees with an initial velocity of 27 m/s? (rounded to the nearest meter) Ignoring air resistance and assuming the same initial velocity, what angle would give you the greatest range for a projectile? Ignoring air resistance and assuming the same initial velocity, what angle would give you the greatest height for a projectile? A 10.-kilogram block of each of these materials is pulled horizontally across a steel floor at constant velocity. Which block requires the smallest applied force to keep it moving at constant velocity? aluminum copper brass steel 93. Four cannonballs, each with mass M and initial velocity V, are fired from a cannon at different angles relative to the Earth. Neglecting air friction, which angular direction of the cannon produces the greatest projectile height? 90º 45º 70º 20º

10 94. The diagram below shows a golf ball being struck by a club. The ball leaves the club with a speed of 40. meters per second at an angle of 60. with the horizontal. 97. Which is a vector quantity? displacement speed mass energy 98. A ship changes direction several times and finishes 20 miles north of its starting point. This displacement is a vector quantity because it has both magnitude and direction magnitude but no direction direction but no magnitude neither magnitude nor direction 99. An object is displaced 3 meters to the west and then 4 meters to the south. If the ball strikes the ground 7.1 seconds later, how far from the golfer does the ball land? [Assume level ground and neglect air resistance.] 35 m 140 m 71 m 280 m 95. Base your answer to the following question on the information below. Which vector shown below best represents the resultant displacement of the block? A ball is projected vertically upward from the surface of the Earth with an initial speed of +49 meters per second. The ball reaches its maximum height in 5.0 seconds. (Disregard air resistance.) What is the maximum height reached by the ball? 24.5 m m 49.0 m 245 m 96. Compared to the force needed to start sliding a crate across a rough level floor, the force needed to keep it sliding once it is moving is less the same greater 100. As the angle between two concurrent forces of 5.0 Newtons and 7.0 Newtons increases from 0º to 180º, the magnitude of their resultant changes from 0 N to 35 N 12 N to 2.0 N 2.0 N to 12 N 12 N to 0 N

11 Answer Key TALBOO MIDTERM NO UCM [Jan 03, 2012] 1. A 32. D 63. C 94. C 2. A 33. A 64. B 95. C 3. B 34. A 65. D 96. A 4. C 35. D 66. A 97. A 5. C 36. D 67. B 98. A 6. D 37. A 68. B 99. C 7. C 38. C 69. D 100. C 8. B 39. A 70. C 9. B 40. D 71. C 10. C 41. D 72. B 11. D 42. D 73. C 12. A 43. D 74. D 13. B 44. D 75. C 14. D 45. A 76. C 15. C 46. B 77. B 16. A 47. B 78. B 17. D 48. D 79. B 18. D 49. A 80. A 19. C 50. D 81. B 20. D 51. B 82. B 21. D 52. C 83. A 22. D 53. B 84. C 23. B 54. B 85. B 24. C 55. B 86. B 25. B 56. D 87. C 26. B 57. B 88. D 27. B 58. A 89. B 28. C 59. C 90. D 29. C 60. A 91. C 30. C 61. C 92. A 31. C 62. A 93. A

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