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FOR SCIENTISTS AND ENGINEERS physics a strategic approach THIRD EDITION randall d. knight © 2013 Pearson Education, Inc. Chapter 5 QuickCheck Questions

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© 2013 Pearson Education, Inc. Be sure to study/review Vector River lab. Be sure to review Hooke’s Law. QuickCheck 5.2 Slide 5-28

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© 2013 Pearson Education, Inc. The net force on an object points to the left. Two of three forces are shown. Which is the missing third force? QuickCheck 5.2 Slide 5-28 A.B. C. D.

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© 2013 Pearson Education, Inc. The net force on an object points to the left. Two of three forces are shown. Which is the missing third force? QuickCheck 5.2 Slide 5-29 Vertical components cancel A.B. C. D.

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© 2013 Pearson Education, Inc. A steel beam hangs from a cable as a crane lifts the beam. What forces act on the beam? A.Gravity. B.Gravity and tension in the cable. C.Gravity and a force of motion. D.Gravity and tension and a force of motion. QuickCheck 5.3 Slide 5-33

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© 2013 Pearson Education, Inc. A steel beam hangs from a cable as a crane lifts the beam. What forces act on the beam? A.Gravity. B.Gravity and tension in the cable. C.Gravity and a force of motion. D.Gravity and tension and a force of motion. QuickCheck 5.3 Slide 5-34

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© 2013 Pearson Education, Inc. A book rests on a horizontal table. Gravity pulls down on the book. You may have learned something in a previous physics class about an upward force called the “normal force.” Deep in your heart, do you really believe the table is exerting an upward force on the book? A.Yes, I’m quite confident the table exerts an upward force on the book. B.No, I don’t see how the table can exert such a force. C.I really don’t know. QuickCheck 5.4 Slide 5-35

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© 2013 Pearson Education, Inc. A bobsledder pushes her sled across horizontal snow to get it going, then jumps in. After she jumps in, the sled gradually slows to a halt. What forces act on the sled just after she’s jumped in? A.Gravity and kinetic friction. B.Gravity and a normal force. C.Gravity and the force of the push. D.Gravity, a normal force, and kinetic friction. E.Gravity, a normal force, kinetic friction, and the force of the push. QuickCheck 5.5 Slide 5-39

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© 2013 Pearson Education, Inc. A bobsledder pushes her sled across horizontal snow to get it going, then jumps in. After she jumps in, the sled gradually slows to a halt. What forces act on the sled just after she’s jumped in? A.Gravity and kinetic friction. B.Gravity and a normal force. C.Gravity and the force of the push. D.Gravity, a normal force, and kinetic friction. E.Gravity, a normal force, kinetic friction, and the force of the push. QuickCheck 5.5 Slide 5-40

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© 2013 Pearson Education, Inc. A cart is pulled to the right with a constant, steady force. How will its acceleration graph look? QuickCheck 5.6 Slide 5-58 A. B. C.

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© 2013 Pearson Education, Inc. A cart is pulled to the right with a constant, steady force. How will its acceleration graph look? QuickCheck 5.6 Slide 5-59 A constant force produces a constant acceleration. A. B. C.

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© 2013 Pearson Education, Inc. A constant force causes an object to accelerate at 4 m/s 2. What is the acceleration of an object with twice the mass that experiences the same force? A.1 m/s 2. B.2 m/s 2. C.4 m/s 2. D.8 m/s 2. E.16 m/s 2. QuickCheck 5.7 Slide 5-64

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© 2013 Pearson Education, Inc. A constant force causes an object to accelerate at 4 m/s 2. What is the acceleration of an object with twice the mass that experiences the same force? A.1 m/s 2. B.2 m/s 2. C.4 m/s 2. D.8 m/s 2. E.16 m/s 2. QuickCheck 5.7 Slide 5-65

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© 2013 Pearson Education, Inc. An object on a rope is lowered at constant speed. Which is true? A.The rope tension is greater than the object’s weight. B.The rope tension equals the object’s weight. C.The rope tension is less than the object’s weight. D.The rope tension can’t be compared to the object’s weight. QuickCheck 5.8 Slide 5-68

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© 2013 Pearson Education, Inc. An object on a rope is lowered at constant speed. Which is true? A.The rope tension is greater than the object’s weight. B.The rope tension equals the object’s weight. C.The rope tension is less than the object’s weight. D.The rope tension can’t be compared to the object’s weight. Constant velocity Zero acceleration QuickCheck 5.8 Slide 5-69

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© 2013 Pearson Education, Inc. An object on a rope is lowered at a steadily decreasing speed. Which is true? A.The rope tension is greater than the object’s weight. B.The rope tension equals the object’s weight. C.The rope tension is less than the object’s weight. D.The rope tension can’t be compared to the object’s weight. QuickCheck 5.9 Slide 5-70

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© 2013 Pearson Education, Inc. An object on a rope is lowered at a steadily decreasing speed. Which is true? A.The rope tension is greater than the object’s weight. B.The rope tension equals the object’s weight. C.The rope tension is less than the object’s weight. D.The rope tension can’t be compared to the object’s weight. QuickCheck 5.9 Slide 5-71 Decreasing downward velocity Acceleration vector points up points up

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© 2013 Pearson Education, Inc. An elevator, lifted by a cable, is moving upward and slowing. Which is the correct free-body diagram? QuickCheck 5.11 Slide 5-80 A.B. C. E. D.

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© 2013 Pearson Education, Inc. An elevator, lifted by a cable, is moving upward and slowing. Which is the correct free-body diagram? QuickCheck 5.11 Slide 5-81 A.B. C. E. D.

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© 2013 Pearson Education, Inc. A ball has been tossed straight up. Which is the correct free-body diagram just after the ball has left the hand? Ignore air resistance. QuickCheck 5.12 Slide 5-82 A.B. C. D.

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© 2013 Pearson Education, Inc. A ball has been tossed straight up. Which is the correct free-body diagram just after the ball has left the hand? Ignore air resistance. QuickCheck 5.12 Slide 5-83 No points of contact. Gravity is the only force. A.B. C. D.

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© 2013 Pearson Education, Inc. A ring, seen from above, is pulled on by three forces. The ring is not moving. How big is the force F ? A.20 N B.10cos N C.10sin N D.20cos N E.20sin N QuickCheck 6.2 Slide 6-32

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© 2013 Pearson Education, Inc. A ring, seen from above, is pulled on by three forces. The ring is not moving. How big is the force F ? A.20 N B.10cos N C.10sin N D.20cos N E.20sin N QuickCheck 6.2 Slide 6-33

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© 2013 Pearson Education, Inc. A car is towed to the right at constant speed. Which is the correct free-body diagram? QuickCheck 6.4 Slide 6-41

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© 2013 Pearson Education, Inc. A car is towed to the right at constant speed. Which is the correct free-body diagram? QuickCheck 6.4 Slide 6-42

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© 2013 Pearson Education, Inc. The box is sitting on the floor of an elevator. The elevator is accelerating upward. The magnitude of the normal force on the box is QuickCheck 6.6 A. n > mg. B. n = mg. C. n < mg. D. n = 0. E. Not enough information to tell. Slide 6-52

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© 2013 Pearson Education, Inc. The box is sitting on the floor of an elevator. The elevator is accelerating upward. The magnitude of the normal force on the box is QuickCheck 6.6 A. n > mg. B. n = mg. C. n < mg. D. n = 0. E. Not enough information to tell. Slide 6-53 Upward acceleration requires a net upward force.

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© 2013 Pearson Education, Inc. A.Her weight is the same and her mass is less. B.Her weight is less and her mass is less. C.Her weight is less and her mass is the same. D.Her weight is the same and her mass is the same. E.Her weight is zero and her mass is the same. QuickCheck 6.7 An astronaut takes her bathroom scales to the moon, where g = 1.6 m/s 2. On the moon, compared to at home on earth: Slide 6-60

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© 2013 Pearson Education, Inc. A.Her weight is the same and her mass is less. B.Her weight is less and her mass is less. C.Her weight is less and her mass is the same. D.Her weight is the same and her mass is the same. E.Her weight is zero and her mass is the same. QuickCheck 6.7 An astronaut takes her bathroom scales to the moon, where g = 1.6 m/s 2. On the moon, compared to at home on earth: Slide 6-61

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© 2013 Pearson Education, Inc. A.> 490 N. B.490 N. C.< 490 N but not 0 N. D.0 N. QuickCheck 6.8 A 50-kg student ( mg = 490 N) gets in a 1000-kg elevator at rest and stands on a metric bathroom scale. As the elevator accelerates upward, the scale reads Slide 6-63

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© 2013 Pearson Education, Inc. A.> 490 N. B.490 N. C.< 490 N but not 0 N. D.0 N. QuickCheck 6.8 A 50-kg student ( mg = 490 N) gets in a 1000-kg elevator at rest and stands on a metric bathroom scale. As the elevator accelerates upward, the scale reads Slide 6-64

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© 2013 Pearson Education, Inc. QuickCheck 6.12 A box on a rough surface is pulled by a horizontal rope with tension T. The box is not moving. In this situation: A. f s > T. B. f s = T. C. f s < T. D. f s = s mg. E. f s = 0. Slide 6-75

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© 2013 Pearson Education, Inc. QuickCheck 6.12 A box on a rough surface is pulled by a horizontal rope with tension T. The box is not moving. In this situation: A. f s > T. B. f s = T. C. f s < T. D. f s = s mg. E. f s = 0. Slide 6-76 Newton’s first law.

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© 2013 Pearson Education, Inc. QuickCheck 6.13 A box with a weight of 100 N is at rest. It is then pulled by a 30 N horizontal force. Does the box move? A.Yes B.No C.Not enough information to say. Slide 6-78

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© 2013 Pearson Education, Inc. QuickCheck 6.13 A box with a weight of 100 N is at rest. It is then pulled by a 30 N horizontal force. Does the box move? A.Yes B.No C.Not enough information to say. Slide 6-79 30 N < f s max = 40 N

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© 2013 Pearson Education, Inc. QuickCheck 6.15 A box is being pulled to the right at steady speed by a rope that angles upward. In this situation: A. n > mg. B. n = mg. C. n < mg. D. n = 0. E. Not enough information to judge the size of the normal force. Slide 6-83

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© 2013 Pearson Education, Inc. QuickCheck 6.15 A box is being pulled to the right at steady speed by a rope that angles upward. In this situation: A. n > mg. B. n = mg. C. n < mg. D. n = 0. E. Not enough information to judge the size of the normal force. Slide 6-84

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© 2013 Pearson Education, Inc. QuickCheck 6.16 A. B. C. D. E. A box is being pulled to the right by a rope that angles upward. It is accelerating. Its acceleration is cos – k g. T m (sin k cos ) – k g. T m (cos k sin ) – k g. T m (cos k sin ) – k g. T m – k g. T m You’ll have to work this one out. Don’t just guess! Slide 6-85

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© 2013 Pearson Education, Inc. QuickCheck 6.16 A. B. C. D. E. A box is being pulled to the right by a rope that angles upward. It is accelerating. Its acceleration is cos – k g. T m (sin k cos ) – k g. T m (cos k sin ) – k g. T m (cos k sin ) – k g. T m – k g. T m Slide 6-86

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© 2013 Pearson Education, Inc. The top block is accelerated across a frictionless table by the falling mass m. The string is massless, and the pulley is both massless and frictionless. The tension in the string is QuickCheck 7.10 Slide 7-78 A. T < mg. B. T = mg. C. T > mg.

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© 2013 Pearson Education, Inc. The top block is accelerated across a frictionless table by the falling mass m. The string is massless, and the pulley is both massless and frictionless. The tension in the string is QuickCheck 7.10 Slide 7-79 A. T < mg. B. T = mg. C. T > mg. Tension has to be less than mg for the block to have a downward acceleration.

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