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Chapter 5: The Laws of Motion

Physics For Scientists & Engineers
Pages: 111 - 149

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44 Questions for Chapter 5: The Laws of Motion

  1. Twenty people participate in a tug-of-war. The two teams of ten people are so evenly matched that neither team wins. After the game, they notice that a car is stuck in the mud. They attach the tug-of-war rope to the bumper of the car, and all the people pull on the rope. The heavy car has just moved a couple of decimeters when the rope breaks. Why it did not break when the same twenty people pulled on it in a tug-of-war?

    Found on Page 137
  2. Question: A large crate of mass m is place on the flatbed of a truck but not tied down. As the truck accelerates forward with acceleration a, the crate remains at rest relative to the truck. What force causes the crate to accelerate? (a) the normal force (b) the gravitational force (c) the friction force (d) the ma force exerted by the crate (e) No force is required.

    Found on Page 137
  3. Can an object exert a force on itself? Argue for your answer?

    Found on Page 138
  4. Question: If an object is in equilibrium, which of the following statements is not true? (a) The speed of the object remains constant. (b) The acceleration of the object is zero. (c) The net force acting on the object is zero. (d) The object must be at rest. (e) There are at least two forces acting on the object.

    Found on Page 137
  5. When you push on a box with a force instead of a force, you can feel that you are making a greater effort. When a table exerts a normal force instead of one of smaller magnitude, is the table really doing anything different?

    Found on Page 138
  6. Question: A crate remains stationary after it has been placed on a ramp inclined at an angle with the horizontal. Which of the following statements is or are correct about the magnitude of the friction force that acts on the crate? Choose all that are true. (a) It is larger than the weight of the crate. (b) It is equal to μ,n. (c) It is greater than the component of the gravitational force acting down the ramp. (d) It is equal to the component of the gravitational force acting down the ramp. (e) It is less than the component of the gravitational force acting down the ramp.

    Found on Page 137
  7. A weightlifter stands on a bathroom scale. He pumps a barbell up and down. What happens to the reading on the scale as he does so? What If? What if he is strong enough to actually throw the barbell upward? How does the reading on the scale vary now?

    Found on Page 138
  8. An object of mass moves with accelerationa→ down a rough incline . Which of the following forces should appear in a free-body diagram of the object ?

    Found on Page 138
  9. An athlete grips a light rope that passes over a low friction pulley attached to the ceiling of a gym. A sack of sand precisely equal in weight to the athlete is tied to the other end of the rope. Both the sand and the athlete are initially at rest. The athlete climbs the rope, sometimes speeding up and showing down as he does so. What happens to the sack of sand? Explain.

    Found on Page 138
  10. Suppose you are driving a classic car. Why should you avoid slamming on your brakes when you want to stop in the shortest possible distance? (Many modern cars have antilock brakes that avoid this problem.)

    Found on Page 138

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