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 twoparticle system
B. the potential energy of the twoparticle system
C. the mechanical energy of the twoparticle system
D. the total linear momentum of the twoparticle system
E. none of the above
ans: B
102
Chapter 8: POTENTIAL ENERGY AND CONSERVATION OF ENERGY
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View Full Document6. 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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 Spring '11
 .
 Physics, Conservation Of Energy, Energy, Force, Kinetic Energy, Potential Energy, Work, ........

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