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Physics
Review of Work, Energy and Power
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Review of Work, Energy and Power
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1. Work is defined as
Force per unit time
Force over a distance
Force per unit distance
None of the above
2. What are the units of work?
Newtons
Watts
Joules
None of the above
3. What is the sign of the work done by gravity on a man standing on a platform?
Zero
Positive
Negative
Depends on the particular situation
4. A force of 10 N works on a ball over a distance of 5 m. The force is parallel to the displacement of the ball. What is the total work done by the force?
-50 N
0 N
2 N
50 N
5. A force of 10 N works on a ball over a distance of 5 m. The force is perpendicular to the displacement of the ball. What is the total work done by the force?
-50 N
0 N
2 N
50 N
6. A force of 10 N works on a ball over a distance of 5 m. The force is antiparallel to the displacement of the ball. What is the total work done by the force?
-50 N
0 N
2 N
50 N
7. The work done by a given force over a given distance is proportional to
The velocity of the particle
The sine of the angle between the force and the displacement
The cosine of the angel between the force and the displacement
The time during which the force acts
8. What is the sign of the work performed on an object in uniform circular motion?
Zero
Positive
Negative
Depends on the particular situation
9. How much work is performed by gravity on an object of mass m in free fall over a distance of h meters?
mh
mg/h
mgh
mh/g
10. A force of 1 N, parallel to the displacement of the object, acts on an object over a distance of 1 m. How much work is done?
1 Joule
1 Watt
2 Joules
2 Watts
11. How is work related to acceleration?
W
=
ma
W
=
mat
W
=
max
W
=
ma
/
x
12. A constant force of 10 N causes a box to move at a constant speed of 2 m/s. How much work is done in 10 seconds?
200 J
50 J
10 J
2 J
13. A mass is kept stationary by an external force. All of the following are true EXCEPT:
The point of application of the force does not move
No work is done on the mass
There is no net force on the mass
The external force may perform work on the mass
14. What is the magnitude of the work done by a force acting on a particle instantaneously?
Zero
Positive
Negative
Depends on the particular situation
15. How is work defined in terms of integrals?
W
=
v
(
x
)
dx
W
=
a
(
x
)
dx
W
=
F
(
x
)(
x
)
dx
W
=
F
(
x
)
dx
16. Energy is measured in the same units as
Power
Force
Work
None of the above
17. Kinetic energy is proportional to
v
^{2}
v
a
Work
18. A force of 2 N acts parallel to the displacement of a particle for a distance of 10 m. What is the kinetic energy of the particle?
5 J
20 J
12 J
Not enough information
19. A force of 2 N acts parallel to the displacement of a particle for a distance of 10 m. What is the change in the kinetic energy of the particle?
5 J
20 J
12 J
Not enough information
20. According to the work-energy theorem, a net work causes
A change in kinetic energy
A change in potential energy
A kinetic energy
A change in the direction of motion of a particle
21. A particle of mass 1 kg experiences a net work of 100 N. what is the change in kinetic energy of the particle?
0 J
10 J
100 J
Not enough information
22. A particle of mass 1 kg experiences a net work of 100 N. what is the change in the velocity of the particle?
0
10 m/s
100 m/s
Not enough information
23. An object falls a distance of h meters. What is the increase in the object's velocity over this distance?
gh
mgh
24. What can be said about the kinetic energy of an object in uniform circular motion?
It is constantly increasing
It is constantly decreasing
It is constant
Its direction is changing, but its magnitude is constant
25. Kinetic energy is
A scalar
Dimensionless
A vector
None of the above
26. Power is defined as
Work per unit length
Force per unit length
Work times time
Work per unit time
27. The units of power are defined as
Joules
Newtons
Joules per meter
Watts
28. A constant force acting over a given distance requires
Constant Power
Increasing Power
Decreasing Power
Not enough information
29. In a period of 10 seconds, an elevator lifts a weight of 1000 N a distance of 10 m at constant velocity. What is the average power of the elevator over this time?
10000 W
100 W
1000 W
0 W
30. At a given point, a force of 20 N acts on a particle with velocity of 5 m/s what is the power exerted by the force?
4 W
100 W
20 W
5 W
31. How many principles of conservative forces are there?
1
2
3
4
32. Which of the following is NOT a conservative force?
Gravity
Spring force
Normal force from a pendulum
Frictional force
33. The work done by a conservative force over a closed loop is always
Positive
Negative
Zero
None of the above
34. The work done by friction over any distance is always
Positive
Negative
Zero
None of the above
35. Path independence for conservative forces means that
The work done over any path is the same
No net work is done over any path
A force of constant magnitude acts over any path
The same work is done over any path between two given points
36. Conservative forces always
Conserve speed
Conserve mechanical energy
Conserve kinetic energy
Conserve position
37. Potential energy is defined for
Nonconservative forces
Conservative forces
Constant velocity
A force that always does zero net work
38. The potential energy is always the same for an object with the same
Velocity
Speed
Acceleration
Position
39. Potential energy is defined as
Energy of motion
Energy of configuration
Total mechanical energy
Energy of acceleration
40. In what way is potential energy related to work?
ΔU
=
W
U
=
W
U
= -
W
ΔU
= -
W
41. The sum of potential and kinetic energy is always
Zero
Positive
Negative
None of the above
42. The sum of the change in kinetic and potential energy is always
Zero
Positive
Negative
None of the above
43. Total mechanical energy is defined as
Kinetic energy
Potential energy
The sum of the kinetic and potential energy
The sum of the change of the kinetic and potential energy
44. The potential energy of gravity is defined as
mg
mg
/
h
mgh
g
/
h
45. The change in potential energy is always equal to the
The change in kinetic energy
The change in mechanical energy
The change in position
The negative of the change in kinetic energy
46. A mass m is allowed to drop from a height h. What it its velocity when it reaches the ground?
mgh
47. What is the total mechanical energy of a mass of 2 kg oscillating on a spring given that the maximum velocity of the mass is 5 m/s and the spring constant is 50 N/m?
10 J
25 J
50 J
124.5 J
48. At what point in the oscillation of a spring is the kinetic energy maximum?
At its equilibrium point
At its maximum displacement
When the spring is most compressed
When the spring is most extended
49. What is the symbol for total mechical energy?
U
E
K
F
50. How is potential energy defined in terms of a position dependent force?
U
= -
F
(
x
)
ΔU
= -
F
(
x
)
ΔU
= -
F
(
x
)
dx
U
= -
F
(
x
)
dx
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