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ConcepTEST.

ConcepTEST. INSTRUCTIONS. For conceptual physics questions, refer to Paul Hewitt’s Conceptual Physics . You are expected to read the material on your own. . PROBLEM 1. An object can be in mechanical equilibrium when only a single force acts on it. PROBLEM 2.

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ConcepTEST.

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  1. ConcepTEST.

  2. INSTRUCTIONS • For conceptual physics questions, refer to Paul Hewitt’s Conceptual Physics. • You are expected to read the material on your own. 

  3. PROBLEM 1 An object can be in mechanical equilibrium when only a single force acts on it.

  4. PROBLEM 2 When a ball is tossed straight up, it momentarily comes to a stop at the top of its path. The ball is in equilibrium during this brief moment.

  5. PROBLEM 3 No force acts on a body at rest.

  6. PROBLEM 4 Free fall is motion in which gravity is the only force acting. A sky diver who has reached terminal speed is in free fall.

  7. PROBLEM 5 Consider a crate at rest on a factory floor. As a pair of workmen begin lifting it, does the support force on the crate provided by the floor increase, decrease, or remain unchanged? What happens to the support force on the workmen’s feet?

  8. PROBLEM 6 As you stand on a floor, does the floor exert an upward force against your feet? How much force does it exert? Why are you not moved upward by this force?

  9. PROBLEM 7 Consider the normal force on a book at rest on a tabletop. If the table is tilted so that the surface forms an inclined plane, will the magnitude of the normal force change? If so, how?

  10. PROBLEM 8 For the pulley system shown, what is the upper limit of weight that the strong man can lift?

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