Download Work and Energy - college physics

Physics Quiz
ENERGY
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1. What is the SI unit of energy?
A. newton
B. erg
C. joule
D. dyne
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2. Kinetic energy is the mechanical energy of __________ .
A. motion
B. position
C. mass
D. acceleration
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3. What factors are needed to compute work done?
A. the mass of an object and its speed
B. the speed of an object and how far it’s moved
C. the kinetic energy of an object and its direction
D. the net force acting on an object, its displacement, and the
angle between the two.
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4. Which equation below correctly computes work?
A. W  Fv
B. W  F cos( ) x
C. W  F cos( )v
D. W  F sin()x
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5. The net work done on an object is
A. the work done by internal forces.
B. the work done by the net force acting on the object.
C. the sum of all the object`s energies.
D. the change in the object`s mechanical energy.
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6. Which of the following is not a mechanical energy, per se?
A. work
B. potential energy
C. kinetic energy
D. potential and kinetic energies added together
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7. The symbol used to represent kinetic energy is
A. E
B. PE
C. U
D. KE
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8. What does the following expression represent?
KE
A. The total kinetic energy of an object.
B. The final kinetic energy of an object.
C. The amount of kinetic energy lost to motion.
D. The change in an object’s kinetic energy.
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9. What does the following expression equal?
KE
A. the change in potential energy
B. the change in total energy
C. the net work done
D. the net force acting
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10. Work and energy are ________ quantities.
A. vector
B. scalar
C. tensor
D. pseudo
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11. What is potential energy?
A. It is the mechanical energy of an object due to its position.
B. It is the mechanical energy of an object due to its motion.
C. It is the change in kinetic energy of an object.
D. It is the net mechanical energy of an object.
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12. If an object is moved so that its elevation above the ground
increases, how does its gravitational potential energy change?
A. it remains constant
B. it decreases
C. it increases
D. there is not enough information to tell
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13. If the height above the ground of an object is doubled, the
object`s potential energy ________ .
A. increases by a factor of 4
B. decreases by a factor of 4
C. decreases by a factor of 2
D. increases by a factor of 2
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14. Which characteristic listed below, is not a characteristic of the
work done by a conservative force?
A. the work done moving an object is independent of the path
taken between start and finish points
B. the work done moving an object around any closed path is
zero
C. the work done moving an object depends only on the start
and end points of the motion
D. the work done moving an object depends on the mass of the
object and not on the start and finish points
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15. Which force listed below is a conservative force?
A. air resistance
B. friction
C. spring force
D. tension
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16. What do conservative forces conserve?
A. potential energy
B. kinetic energy
C. total mechanical energy
D. net work
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17. If a mass attached to a spring is displaced x from equilibrium
and has a net force of Fo acting on it, what force will act on the
mass when it is displaced 2x from equilibrium?
A. 2Fo
B. Fo/2
C. Fo/4
D. 4Fo
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18. Which equation is not an expression of the work-energy
theorem?
A.
KE  PE  WNC
B.
KE  WNET
C.
E  WNC
D.
PE  WC
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19. A flowerpot falls from a windowsill 10.0 m above the ground. At
what height above the ground will the flowerpot`s kinetic and
potential energies be equal?
A. 10.0 m
B. 5.0 m
C. 0.0 m
D. They will never be equal because they are conserved.
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20. Average Power is __________ .
A. the ratio of work to total mechanical energy
B. the ratio of kinetic to potential energy
C. the rate at which force is applied
D. the rate at which work is done.
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21. What is the SI unit for power?
A. joule
B. watt
C. erg
D. kilovolt
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22. How is instantaneous power calculated?
A.
B.
C.
D.
P  F x
P  W x
F
P
v
P  Fv
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