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Chapter 8

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  1. Chapter 8

  2. What, if anything, is wrong with the force diagram for a bicycle that is accelerating toward the right? 1. It does not draw each object separately. 2. It draws interactions between one body and itself. 3. It fails to identify all relevant forces. 4. Nothing is wrong.

  3. What, if anything, is wrong with the force diagram for a bicycle that is accelerating toward the right? 1. It does not draw each object separately. 2. It draws interactions between one body and itself. 3. It fails to identify all relevant forces. 4. Nothing is wrong.

  4. Car B is stopped for a red light. Car A, which has the same mass as car B, doesn’t see the red light and runs into the back of B. Which of the following statements is true? 1. B exerts a force on A but A doesn’t exert a force on B. 2. B exerts a larger force on A than A exerts on B. 3. B exerts the same amount of force on A as A exerts on B. 4. A exerts a larger force on B than B exerts on A. 5. A exerts a force on B but B doesn’t exert a force on A.

  5. Car B is stopped for a red light. Car A, which has the same mass as car B, doesn’t see the red light and runs into the back of B. Which of the following statements is true? 1. B exerts a force on A but A doesn’t exert a force on B. 2. B exerts a larger force on A than A exerts on B. 3. B exerts the same amount of force on A as A exerts on B. 4. A exerts a larger force on B than B exerts on A. 5. A exerts a force on B but B doesn’t exert a force on A.

  6. Boxes A and B are sliding to the right across a frictionless table. The hand H is slowing them down. The mass of A is larger than the mass of B. Rank in order, from largest to smallest, the horizontal forces on A, B, and H. 1. FB on H = FH on B = FA on B = FB on A 2. FB on H = FH on B < FA on B = FB on A 3. FB on H = FH on B < FA on B = FB on A 4. FH on B = FH on A > FA on B

  7. Boxes A and B are sliding to the right across a frictionless table. The hand H is slowing them down. The mass of A is larger than the mass of B. Rank in order, from largest to smallest, the horizontal forces on A, B, and H. 1. FB on H = FH on B = FA on B = FB on A 2. FB on H = FH on B < FA on B = FB on A 3. FB on H = FH on B < FA on B = FB on A 4. FH on B = FH on A > FA on B

  8. All three 50 kg blocks are at rest. Is the tension in rope 2 greater than, less than or equal to the tension in rope 1? • 1. greater than • 2. less than • 3. equal to

  9. All three 50 kg blocks are at rest. Is the tension in rope 2 greater than, less than or equal to the tension in rope 1? • 1. greater than • 2. less than • 3. equal to

  10. In the figure to the right is the tension in the string greater than, less than, or equal to the weight of block B? 1. Greater than 2. Less than 3. Equal to

  11. In the figure to the right is the tension in the string greater than, less than, or equal to the weight of block B? 1. Greater than 2. Less than 3. Equal to

  12. A small car is pushing a larger truck that has a dead battery. The mass of the truck is larger than the mass of the car. Which of the following statements is true? 1. The car exerts a force on the truck but the truck doesn’t exert a force on the car. 2. The car exerts a larger force on the truck than the truck exerts on the car. 3. The car exerts the same amount of force on the truck as the truck exerts on the car. 4. The truck exerts a larger force on the car than the car exerts on the truck. 5. The truck exerts a force on the car but the car doesn’t exert a force on the truck.

  13. A small car is pushing a larger truck that has a dead battery. The mass of the truck is larger than the mass of the car. Which of the following statements is true? 1. The car exerts a force on the truck but the truck doesn’t exert a force on the car. 2. The car exerts a larger force on the truck than the truck exerts on the car. 3. The car exerts the same amount of force on the truck as the truck exerts on the car. 4. The truck exerts a larger force on the car than the car exerts on the truck. 5. The truck exerts a force on the car but the car doesn’t exert a force on the truck.

  14. Chapter 8 Reading Quiz

  15. The propulsion force on a car is due to 1. static friction. 2. kinetic friction. 3. the car engine. 4. elastic energy.

  16. The propulsion force on a car is due to 1. static friction. 2. kinetic friction. 3. the car engine. 4. elastic energy.

  17. Is the tension in rope 2 greater than, less than, or equal to the tension in rope 1? 1. greater than rope 2 2. less than than rope 2 3. equal to rope 2

  18. Is the tension in rope 2 greater than, less than, or equal to the tension in rope 1? 1. greater than rope 2 2. less than than rope 2 3. equal to rope 2

  19. An acceleration constraint says that in some circumstances 1. the acceleration of an object has to be positive. 2. two objects have to accelerate in the same direction. 3. the magnitude of the accelerations of two objects have to be equal. 4. an object is prevented from accelerating. 5. Acceleration constraints were not discussed in this chapter.

  20. An acceleration constraint says that in some circumstances 1. the acceleration of an object has to be positive. 2. two objects have to accelerate in the same direction. 3. the magnitude of the accelerations of two objects have to be equal. 4. an object is prevented from accelerating. 5. Acceleration constraints were not discussed in this chapter.