Answer this question:

the net work done by the two forces is zero

In which of the following situations will there be an increase in kinetic energy?

a ball starts from rest and rolls freely downhill

A donkey pulls a crate up a rough, inclined plane at constant speed. Which statement is false?

the work done on the object by gravity is zero joules

Which one of the following has the largest kinetic energy?

the Earth moving in its orbit around the sun

Which one of the following statements concerning kinetic energy is true?

Kinetic energy is always positive.

Which one of the following situations is an example of an object with non zero kinetic energy?

a satellite in geosynchronous orbit

A force that acts on an object is said to be conservative if

the work it does on the object is independent of the path

In which of the following situations is zero net work done?

a box is pulled across a rough floor at constant velocity

Answer this question:

The lighter one has ½ as much kinetic energy as the other.

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Physics: Energy

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physics energy

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Questions 20

Answers

1
Answer this question:
8 x 105 W
8 x 107 W
8 x 104 W
8 x 106 W
2
Answer this question:
magnitude of tension work > magnitude of gravitational work
magnitude of tension work < magnitude of gravitational work
the net work done by the two forces is zero
the work done by the tension force is zero joules
3
Answer this question:
16.1 m/s
131 m/s
32.2 m/s
11.4 m/s
4
Answer this question:
80 J
30 J
100 J
160 J
5
In which of the following situations will there be an increase in kinetic energy?
a ball starts from rest and rolls freely downhill
a satellite travels in a circular orbit at a fixed altitude
a box is pulled across a rough floor at constant speed
a projectile approaches its maximum height
6
Which of the following choices is an example of a conservative force?
tension
elastic spring force
static frictional force
normal
7
What power is needed to lift a 50 kg person a vertical distance of 5.0 m in 20.0 s?
500 W
125 W
none of the above
12.5 W
8
A donkey pulls a crate up a rough, inclined plane at constant speed. Which statement is false?
the work done on the object by gravity is zero joules
the gravitational potential energy is increasing
the net work done by all the forces on the crate is zero
the work done on the crate by the normal force is zero
9
Answer this question:
80 J
400 J
300 J
100 J
10
Which one of the following has the largest kinetic energy?
a raindrop falling
the Earth moving in its orbit around the sun
a woman swimming
a jet airplane flying at its maximum speed
11
Work may be expressed using all of the following units except:
watt
foot pound
Newton meter
joule
12
Which one of the following statements concerning kinetic energy is true?
Kinetic energy is always equal to potential energy.
Kinetic energy is always positive.
Kinetic energy is a quantitative measure of inertia.
Kinetic energy can be measured in watts.
13
Which one of the following situations is an example of an object with non zero kinetic energy?
a drum of diesel fuel on a parked truck
a car parked at the top of the hill
a stationary pendulum
a satellite in geosynchronous orbit
14
A force that acts on an object is said to be conservative if
it obey's Newton's laws of motion
the work it does on the object is independent of the path
it always acts in the direction of motion of the object
it results in a change in the object's kinetic energy
15
Answer this question:
0.60
0.32
0.30
0.76
16
In which of the following situations is zero net work done?
a ball rolls down an inclined plane
a physics student stretches a spring
a projectile falls toward the surface of the Earth
a box is pulled across a rough floor at constant velocity
17
Answer this question:
190 J
270 J
140 J
450 J
18
Answer this question:
The lighter one has the same kinetic energy as the other.
The lighter one has ½ as much kinetic energy as the other.
The lighter one has ¼ as much kinetic energy as the other.
The lighter one has 2x as much kinetic energy as the other.
19
Answer this question:
7.7 m/s
59 m/s
8.7 m/s
76 m/s
20
Which of the following choices is an example of a non-conservative force?
electric force
gravitational force
elastic spring force
kinetic frictional force

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