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Chapter 08

# Chapter 08 - Chapter 8 POTENTIAL ENERGY AND CONSERVATION OF...

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Chapter 8: POTENTIAL ENERGY AND CONSERVATION OF ENERGY 1. Only if a force on a particle is conservative: A. is its work zero when the particle moves exactly once around any closed path B. is its work always equal to the change in the kinetic energy of the particle C. does it obey Newton’s second law D. does it obey Newton’s third law E. is it not a frictional force ans: A 2. A nonconservative force: 3. The sum of the kinetic and potential energies of a system of objects is conserved: 4. A force on a particle is conservative if: 5. Two particles interact by conservative forces. In addition, an external force acts on each particle. They complete round trips, ending at the points where they started. Which of the following must have the same values at the beginning and end of this trip? A. the total kinetic energy of the two-particle system B. the potential energy of the two-particle system C. the mechanical energy of the two-particle system D. the total linear momentum of the two-particle system E. none of the above ans: B 102 Chapter 8: POTENTIAL ENERGY AND CONSERVATION OF ENERGY

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6. Two objects interact with each other and with no other objects. Initially object A has a speed of 5 m / s and object B has a speed of 10 m / s. In the course of their motion they return to their initial positions. Then A has a speed of 4 m / s and B has a speed of 7 m / s. We can conclude: 7. A good example of kinetic energy is provided by: 8. No kinetic energy is possessed by: 9. The wound spring of a clock possesses: A. kinetic but no potential energy B. potential but no kinetic energy C. both potential and kinetic energy in equal amounts D. neither potential nor kinetic energy E. both potential and kinetic energy, but more kinetic energy than potential energy ans: B 10. A body at rest in a system is capable of doing work if:
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