p101chap06pretest

p101chap06pretest - Chapter 6: Energy and Oscillations 1....

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Chapter 6: Energy and Oscillations 1. Which of the following is not an energy unit? A. N·m B. Joule C. calorie D. watt E. kWh Answer: D 2. Work is not being done on an object unless the A. net force on the object is zero. B. object is being accelerated. C. speed is constant. D. object is moving. Answer: D 3. A brick slides across a horizontal rough surface and eventually comes to a stop. What happened to the kinetic energy of the brick? A. Nothing, it is still in the brick but is now called potential energy. B. It was converted to other energy forms, mostly heat. C. It was converted to a potential energy of friction. D. It was simply destroyed in the process of stopping. Answer: B 4. Which of the following is possessed by moving object, but not by a stationary object? A. Energy. B. Kinetic energy. C. Mass. D. Inertia. Answer: B 5. The power of an engine is a measure of A. its volume. B. its ability to outperform a horse. C. the rate at which it can perform work. D. the total amount of work it can perform. Answer: C 6. Which has the greater kinetic energy - a 1-ton car moving at 30 m/s, or a half-ton car moving at 60 m/s? A. a 1-ton car B. a half-ton car C. both have same kinetic energy Answer: B
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7. A 20 N ball and a 40 N ball are dropped at the same time from a height of 10 meters. Air resistance is negligible. Which of the following statements is accurate? A. After 1 second has elapsed, both balls have the same kinetic energy since they have the same acceleration. B. The heavy ball has a greater acceleration and falls faster. C. The light ball has a greater speed since it can accelerate faster than the heavy ball. D. Both balls hit the ground at the same time but gravity does more work on the heavy ball than on the light ball. Answer: D 8. When work is done by a force on an object, then which of the following are true? A. The speed of the object always increases. B. The mass of the object always increases. C. The object does negative work on the force. D. The energy lost to friction is equal to the amount of work done by the force. E. The work done will be equal to the change of the total energy of the object plus energy appearing as heat, light, or sound. Answer: E 9. A block sits on a slight incline, held at rest by the frictional force between the block and the incline. Which of the following statements is true? A. The frictional force performs no work since there is no motion of the block. B. The work by the frictional force is equal to the gravitational potential energy of the block. C. The work done by the frictional force is negative since the force of friction opposes the direction that the block is being tugged by gravity. D. The work done by gravity is entirely converted into heat because of the friction present. E.
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This note was uploaded on 07/10/2008 for the course PHYS 1030 taught by Professor Ross during the Summer '08 term at Northeast State.

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p101chap06pretest - Chapter 6: Energy and Oscillations 1....

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