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ConcepTest 5.1 Tetherball

. The vertical component of the tension balances the weight. The horizontal component of tension provides the centripetal force that points toward the center of the circle.. . 1) toward the top of the pole2) toward the ground3) along the horizontal component of the tension force4) along the vertical component of the tension force5) tangential to the circle.

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ConcepTest 5.1 Tetherball

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    1. ConcepTest 5.1 Tetherball In the game of tetherball, the struck ball whirls around a pole. In what direction does the net force on the ball point?

    3. You are a passenger in a car, not wearing a seat belt. The car makes a sharp left turn. From your perspective in the car, what do you feel is happening to you? ConcepTest 5.2a Around the Curve I

    4. You are a passenger in a car, not wearing a seat belt. The car makes a sharp left turn. From your perspective in the car, what do you feel is happening to you? ConcepTest 5.2a Around the Curve I

    5. During that sharp left turn, you found yourself hitting the passenger door. What is the correct description of what is actually happening? ConcepTest 5.2b Around the Curve II

    6. During that sharp left turn, you found yourself hitting the passenger door. What is the correct description of what is actually happening? ConcepTest 5.2b Around the Curve II

    7. You drive your dad’s car too fast around a curve and the car starts to skid. What is the correct description of this situation? ConcepTest 5.2c Around the Curve III

    8. You drive your dad’s car too fast around a curve and the car starts to skid. What is the correct description of this situation? ConcepTest 5.2c Around the Curve III

    9. ConcepTest 5.3 Missing Link A ping pong ball is shot into a circular tube that is lying flat (horizontal) on a tabletop. When the ping pong ball leaves the track, which path will it follow?

    10. ConcepTest 5.3 Missing Link A ping pong ball is shot into a circular tube that is lying flat (horizontal) on a tabletop. When the ping pong ball leaves the track, which path will it follow?

    11. ConcepTest 5.4 Ball and String Two equal-mass rocks tied to strings are whirled in horizontal circles. The radius of circle 2 is twice that of circle 1. If the period of motion is the same for both rocks, what is the tension in cord 2 compared to cord 1?

    12. ConcepTest 5.4 Ball and String Two equal-mass rocks tied to strings are whirled in horizontal circles. The radius of circle 2 is twice that of circle 1. If the period of motion is the same for both rocks, what is the tension in cord 2 compared to cord 1?

    13. ConcepTest 5.5 Barrel of Fun A rider in a “barrel of fun” finds herself stuck with her back to the wall. Which diagram correctly shows the forces acting on her?

    14. ConcepTest 5.5 Barrel of Fun A rider in a “barrel of fun” finds herself stuck with her back to the wall. Which diagram correctly shows the forces acting on her?

    15. ConcepTest 5.6a Going in Circles I You’re on a Ferris wheel moving in a vertical circle. When the Ferris wheel is at rest, the normal force N exerted by your seat is equal to your weight mg. How does N change at the top of the Ferris wheel when you are in motion?

    16. ConcepTest 5.6a Going in Circles I You’re on a Ferris wheel moving in a vertical circle. When the Ferris wheel is at rest, the normal force N exerted by your seat is equal to your weight mg. How does N change at the top of the Ferris wheel when you are in motion?

    17. A skier goes over a small round hill with radius R. Since she is in circular motion, there has to be a centripetal force. At the top of the hill, what is Fc of the skier equal to? ConcepTest 5.6b Going in Circles II

    18. A skier goes over a small round hill with radius R. Since she is in circular motion, there has to be a centripetal force. At the top of the hill, what is Fc of the skier equal to? ConcepTest 5.6b Going in Circles II

    19. You swing a ball at the end of string in a vertical circle. Since the ball is in circular motion there has to be a centripetal force. At the top of the ball’s path, what is Fc equal to? ConcepTest 5.7c Going in Circles III

    20. You swing a ball at the end of string in a vertical circle. Since the ball is in circular motion there has to be a centripetal force. At the top of the ball’s path, what is Fc equal to? ConcepTest 5.7c Going in Circles III

    27. You are adding vectors of length 20 and 40 units. What is the only possible resultant magnitude that you can obtain out of the following choices? [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    28. You are adding vectors of length 20 and 40 units. What is the only possible resultant magnitude that you can obtain out of the following choices? [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    29. A small cart is rolling at constant velocity on a flat track. It fires a ball straight up into the air as it moves. After it is fired, what happens to the ball? [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    30. A small cart is rolling at constant velocity on a flat track. It fires a ball straight up into the air as it moves. After it is fired, what happens to the ball? [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    33. A book is lying at rest on a table. The book will remain there at rest because:

    34. A book is lying at rest on a table. The book will remain there at rest because:

    35. A hockey puck slides on ice at constant velocity. What is the net force acting on the puck?

    36. A hockey puck slides on ice at constant velocity. What is the net force acting on the puck?

    37. You put your book on the bus seat next to you. When the bus stops suddenly, the book slides forward off the seat. Why?

    38. You put your book on the bus seat next to you. When the bus stops suddenly, the book slides forward off the seat. Why?

    39. ConcepTest 6.1 To Work or Not to Work

    40. ConcepTest 6.1 To Work or Not to Work

    41. ConcepTest 6.2a Friction and Work I A box is being pulled across a rough floor at a constant speed. What can you say about the work done by friction?

    42. ConcepTest 6.2a Friction and Work I A box is being pulled across a rough floor at a constant speed. What can you say about the work done by friction?

    43. ConcepTest 6.2c Play Ball!

    44. ConcepTest 6.2c Play Ball!

    45. ConcepTest 7.3a Momentum and Force

    46. ConcepTest 7.3a Momentum and Force

    47. ConcepTest 7.3b Velocity and Force

    48. ConcepTest 7.3b Velocity and Force

    49. ConcepTest 7.4 Collision Course A small car and a large truck collide head-on and stick together. Which one has the larger momentum change?

    50. ConcepTest 7.4 Collision Course A small car and a large truck collide head-on and stick together. Which one has the larger momentum change?

    53. ConcepTest 2.7 Velocity in One Dimension If the average velocity is non-zero over some time interval, does this mean that the instantaneous velocity is never zero during the same interval?

    54. ConcepTest 2.7 Velocity in One Dimension If the average velocity is non-zero over some time interval, does this mean that the instantaneous velocity is never zero during the same interval?

    55. ConcepTest 2.8a Acceleration I If the velocity of a car is non-zero (v š 0), can the acceleration of the car be zero?

    56. ConcepTest 2.8a Acceleration I If the velocity of a car is non-zero (v š 0), can the acceleration of the car be zero?

    57. You drop a package from a plane flying at constant speed in a straight line. Without air resistance, the package will: [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    58. You drop a package from a plane flying at constant speed in a straight line. Without air resistance, the package will: [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    59. From the same height (and at the same time), one ball is dropped and another ball is fired horizontally. Which one will hit the ground first? [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    60. From the same height (and at the same time), one ball is dropped and another ball is fired horizontally. Which one will hit the ground first? [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    61. In the previous problem, which ball has the greater velocity at ground level? [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    62. In the previous problem, which ball has the greater velocity at ground level? [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    65. Consider a cart on a horizontal frictionless table. Once the cart has been given a push and released, what will happen to the cart?

    66. Consider a cart on a horizontal frictionless table. Once the cart has been given a push and released, what will happen to the cart?

    67. We just decided that the cart continues with constant velocity. What would have to be done in order to have the cart continue with constant acceleration?

    68. We just decided that the cart continues with constant velocity. What would have to be done in order to have the cart continue with constant acceleration?

    69. ConcepTest 6.2d Tension and Work A ball tied to a string is being whirled around in a circle. What can you say about the work done by tension?

    70. ConcepTest 6.2d Tension and Work A ball tied to a string is being whirled around in a circle. What can you say about the work done by tension?

    71. ConcepTest 6.3 Force and Work A box is being pulled up a rough incline by a rope connected to a pulley. How many forces are doing work on the box? [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    72. ConcepTest 6.3 Force and Work A box is being pulled up a rough incline by a rope connected to a pulley. How many forces are doing work on the box?

    73. ConcepTest 6.5a Kinetic Energy I

    74. ConcepTest 6.5a Kinetic Energy I

    75. ConcepTest 7.5a Two Boxes I Two boxes, one heavier than the other, are initially at rest on a horizontal frictionless surface. The same constant force F acts on each one for exactly 1 second. Which box has more momentum after the force acts?

    76. ConcepTest 7.5a Two Boxes I Two boxes, one heavier than the other, are initially at rest on a horizontal frictionless surface. The same constant force F acts on each one for exactly 1 second. Which box has more momentum after the force acts?

    77. ConcepTest 7.5b Two Boxes II

    78. ConcepTest 7.5b Two Boxes II

    79. ConcepTest 7.7 Impulse

    80. ConcepTest 7.7 Impulse

    81. When throwing a ball straight up, which of the following is true about its velocity v and its acceleration a at the highest point in its path?

    82. When throwing a ball straight up, which of the following is true about its velocity v and its acceleration a at the highest point in its path?

    83. You throw a ball straight up into the air. After it leaves your hand, at what point in its flight does it have the maximum value of acceleration?

    84. You throw a ball straight up into the air. After it leaves your hand, at what point in its flight does it have the maximum value of acceleration?

    87. [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    88. [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    89. A battleship simultaneously fires two shells at two enemy submarines. The shells are launched with the same initial velocity. If the shells follow the trajectories shown, which submarine gets hit first ? [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    90. A battleship simultaneously fires two shells at two enemy submarines. The shells are launched with the same initial velocity. If the shells follow the trajectories shown, which submarine gets hit first ? [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    91. For a cannon on Earth, the cannonball would follow path 2. Instead, if the same cannon were on the Moon, where g = 1.6 m/s2, which path would the cannonball take in the same situation?

    92. For a cannon on Earth, the cannonball would follow path 2. Instead, if the same cannon were on the Moon, where g = 1.6 m/s2, which path would the cannonball take in the same situation?

    93. A block of mass m rests on the floor of an elevator that is moving upward at constant speed. What is the relationship between the force due to gravity and the normal force on the block?

    94. A block of mass m rests on the floor of an elevator that is moving upward at constant speed. What is the relationship between the force due to gravity and the normal force on the block?

    95. A block of mass m rests on the floor of an elevator that is accelerating upward. What is the relationship between the force due to gravity and the normal force on the block? [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    96. A block of mass m rests on the floor of an elevator that is accelerating upward. What is the relationship between the force due to gravity and the normal force on the block?

    97. Below you see two cases: a physics student pulling or pushing a sled with a force F which is applied at an angle q. In which case is the normal force greater?

    98. Below you see two cases: a physics student pulling or pushing a sled with a force F which is applied at an angle q. In which case is the normal force greater?

    99. ConcepTest 6.14 Elastic Potential Energy

    100. ConcepTest 6.14 Elastic Potential Energy

    101. ConcepTest 6.15 Springs and Gravity

    102. ConcepTest 6.15 Springs and Gravity

    103. ConcepTest 6.16 Down the Hill Three balls of equal mass start from rest and roll down different ramps. All ramps have the same height. Which ball has the greater speed at the bottom of its ramp?

    104. ConcepTest 6.16 Down the Hill Three balls of equal mass start from rest and roll down different ramps. All ramps have the same height. Which ball has the greater speed at the bottom of its ramp?

    105. ConcepTest 7.9a Going Bowling I A bowling ball and a ping-pong ball are rolling toward you with the same momentum. If you exert the same force to stop each one, which takes a longer time to bring to rest?

    106. ConcepTest 7.9a Going Bowling I A bowling ball and a ping-pong ball are rolling toward you with the same momentum. If you exert the same force to stop each one, which takes a longer time to bring to rest?

    107. ConcepTest 7.12a Inelastic Collisions I A box slides with initial velocity 10 m/s on a frictionless surface and collides inelastically with an identical box. The boxes stick together after the collision. What is the final velocity?

    108. ConcepTest 7.12a Inelastic Collisions I A box slides with initial velocity 10 m/s on a frictionless surface and collides inelastically with an identical box. The boxes stick together after the collision. What is the final velocity?

    109. ConcepTest 7.13a Nuclear Fission I A uranium nucleus (at rest) undergoes fission and splits into two fragments, one heavy and the other light. Which fragment has the greater momentum?

    110. ConcepTest 7.13a Nuclear Fission I A uranium nucleus (at rest) undergoes fission and splits into two fragments, one heavy and the other light. Which fragment has the greater momentum?

    111. ConcepTest 2.13a Graphing Velocity I

    112. ConcepTest 2.13a Graphing Velocity I

    113. 1) it speeds up all the time 2) it slows down all the time 3) it moves at constant velocity 4) sometimes it speeds up and sometimes it slows down 5) not really sure [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    114. 1) it speeds up all the time 2) it slows down all the time 3) it moves at constant velocity 4) sometimes it speeds up and sometimes it slows down 5) not really sure

    115. [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    116. [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    117. [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    118. [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    119. ConcepTest 2.15a Rubber Balls I [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    120. ConcepTest 2.15a Rubber Balls I [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    121. [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    122. [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    125. Your little sister wants you to give her a ride on her sled. On level ground, what is the easiest way to accomplish this?

    126. Your little sister wants you to give her a ride on her sled. On level ground, what is the easiest way to accomplish this?

    127. A box of weight 100 N is at rest on a floor where ms = 0.5. A rope is attached to the box and pulled horizontally with tension T = 30 N. Which way does the box move?

    128. A box of weight 100 N is at rest on a floor where ms = 0.5. A rope is attached to the box and pulled horizontally with tension T = 30 N. Which way does the box move?

    129. A box sits on a flat board. You lift one end of the board, making an angle with the floor. As you increase the angle, the box will eventually begin to slide down. Why?

    130. A box sits on a flat board. You lift one end of the board, making an angle with the floor. As you increase the angle, the box will eventually begin to slide down. Why?

    131. ConcepTest 6.17b Runaway Box A box sliding on a frictionless flat surface runs into a fixed spring, which compresses a distance x to stop the box. If the initial speed of the box were doubled, how much would the spring compress in this case?

    132. ConcepTest 6.17b Runaway Box A box sliding on a frictionless flat surface runs into a fixed spring, which compresses a distance x to stop the box. If the initial speed of the box were doubled, how much would the spring compress in this case?

    133. ConcepTest 6.19 Cart on a Hill A cart starting from rest rolls down a hill and at the bottom has a speed of 4 m/s. If the cart were given an initial push, so its initial speed at the top of the hill was 3 m/s, what would be its speed at the bottom?

    134. ConcepTest 6.19 Cart on a Hill A cart starting from rest rolls down a hill and at the bottom has a speed of 4 m/s. If the cart were given an initial push, so its initial speed at the top of the hill was 3 m/s, what would be its speed at the bottom?

    135. ConcepTest 6.20a Falling Leaves

    136. ConcepTest 6.20a Falling Leaves

    137. Amy (150 lbs) and Gwen (50 lbs) are standing on slippery ice and push off each other. If Amy slides at 6 m/s, what speed does Gwen have? ConcepTest 7.14a Recoil Speed I

    138. Amy (150 lbs) and Gwen (50 lbs) are standing on slippery ice and push off each other. If Amy slides at 6 m/s, what speed does Gwen have? ConcepTest 7.14a Recoil Speed I

    139. ConcepTest 7.14b Recoil Speed II A cannon sits on a stationary railroad flatcar with a total mass of 1000 kg. When a 10-kg cannon ball is fired to the left at a speed of 50 m/s, what is the recoil speed of the flatcar?

    140. ConcepTest 7.14b Recoil Speed II A cannon sits on a stationary railroad flatcar with a total mass of 1000 kg. When a 10-kg cannon ball is fired to the left at a speed of 50 m/s, what is the recoil speed of the flatcar?

    141. ConcepTest 7.17 Shut the Door! You are lying in bed and you want to shut your bedroom door. You have a superball and a blob of clay (both with the same mass) sitting next to you. Which one would be more effective to throw at your door to close it?

    142. ConcepTest 7.17 Shut the Door! You are lying in bed and you want to shut your bedroom door. You have a superball and a blob of clay (both with the same mass) sitting next to you. Which one would be more effective to throw at your door to close it?

    143. ConcepTest 6.13 Up the Hill Two paths lead to the top of a big hill. One is steep and direct, while the other is twice as long but less steep. How much more potential energy would you gain if you take the longer path?

    144. ConcepTest 6.13 Up the Hill Two paths lead to the top of a big hill. One is steep and direct, while the other is twice as long but less steep. How much more potential energy would you gain if you take the longer path?

    145. ConcepTest 6.21a Time for Work I Mike applied 10 N of force over 3 m in 10 seconds. Joe applied the same force over the same distance in 1 minute. Who did more work?

    146. ConcepTest 6.21a Time for Work I Mike applied 10 N of force over 3 m in 10 seconds. Joe applied the same force over the same distance in 1 minute. Who did more work?

    147. ConcepTest 6.21b Time for Work II

    148. ConcepTest 6.21b Time for Work II

    149. A force F acts on mass M for a time interval T, giving it a final speed v. If the same force acts for the same time on a different mass 2M, what would be the final speed of the bigger mass?

    150. A force F acts on mass M for a time interval T, giving it a final speed v. If the same force acts for the same time on a different mass 2M, what would be the final speed of the bigger mass?

    151. What can you say about the force of gravity Fg acting on a stone and a feather?

    152. What can you say about the force of gravity Fg acting on a stone and a feather?

    153. What can you say about the acceleration of gravity acting on the stone and the feather?

    154. What can you say about the acceleration of gravity acting on the stone and the feather?

    159. ConcepTest 6.6a Free Fall I

    160. ConcepTest 6.6a Free Fall I

    161. ConcepTest 6.6b Free Fall II

    162. ConcepTest 6.6b Free Fall II

    163. ConcepTest 6.7 Work and KE

    164. ConcepTest 6.7 Work and KE

    165. Consider two identical blocks, one resting on a flat surface, and the other resting on an incline. For which case is the normal force greater? [CORRECT 5 ANSWER] [CORRECT 5 ANSWER]

    166. Consider two identical blocks, one resting on a flat surface, and the other resting on an incline. For which case is the normal force greater?

    167. A small car collides with a large truck. Which experiences the greater impact force?

    168. A small car collides with a large truck. Which experiences the greater impact force?

    169. In the collision between the car and the truck, which has the greater acceleration?

    170. In the collision between the car and the truck, which has the greater acceleration?

    171. ConcepTest 6.8a Slowing Down If a car traveling 60 km/hr can brake to a stop within 20 m, what is its stopping distance if it is traveling 120 km/hr? Assume that the braking force is the same in both cases.

    172. ConcepTest 6.8a Slowing Down If a car traveling 60 km/hr can brake to a stop within 20 m, what is its stopping distance if it is traveling 120 km/hr? Assume that the braking force is the same in both cases.

    173. ConcepTest 6.9a Work and Energy I

    174. ConcepTest 6.9a Work and Energy I

    175. ConcepTest 6.9b Work and Energy II

    176. ConcepTest 6.9b Work and Energy II

    177. You tie a rope to a tree and you pull on the rope with a force of 100 N. What is the tension in the rope?

    178. You tie a rope to a tree and you pull on the rope with a force of 100 N. What is the tension in the rope?

    179. Two tug-of-war opponents each pull with a force of 100 N on opposite ends of a rope. What is the tension in the rope?

    180. Two tug-of-war opponents each pull with a force of 100 N on opposite ends of a rope. What is the tension in the rope?

    181. A box sits in a pickup truck on a frictionless truck bed. When the truck accelerates forward, the box slides off the back of the truck because:

    182. A box sits in a pickup truck on a frictionless truck bed. When the truck accelerates forward, the box slides off the back of the truck because:

    183. ConcepTest 6.10 Sign of the Energy I

    184. ConcepTest 6.10 Sign of the Energy I

    185. ConcepTest 6.11 Sign of the Energy II

    186. ConcepTest 6.11 Sign of the Energy II

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