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WorksheetsWork, Energy and Power
Total questions: 55
Worksheet time: 1hrs 24mins
d=10 m
F=???
If 150 Joules of work is needed to move a box 10 meters, what force was used?
1500 N
15 N
1.5 N
150 N
W=5000 Joules
t=???
What is the equation for work?
W = mass x acceleration
W = force x distance
W = force / distance
W = speed / time
Suppose a cart has a kinetic energy of 0.5 J. If you add enough mass to double the mass and make the cart go three times as fast, its kinetic energy is now ---.
6 J
3 J
18 J
9 J
Two equal mass marbles are at the top of a ramp. One marble falls to the ground off the back while the other rolls down the ramp. What is true about the marbles when they reach the ground?
The marble that rolled down the ramp is moving faster than the marble that fell.
The marble that fell down the back of the ramp is moving faster than the marble that rolled.
The marble that rolled down the ramp is not moving when it reaches the ground.
The two marbles are moving with the same speed.
A crane lifts an 8-m long steel girder weighing 2600 N up 15 m off the ground. The crane did ___ of work.
0 J
39000 J
20800 J
2600 J
Potential energy is associated with ---.
speed
position
direction
temperature
Kinetic energy is associated with ---.
speed
position
direction
temperature
A block starts at rest at point P at the top of a ramp which is height h above the ground. The block slides down one side and up the other, stopping at a point less than h above the ground.
The block did not go as high on the other side because gravity pulls down.
The block did not go as high on the other side because potential energy always has to decrease.
The block did not go as high on the other side because work from friction made the mechanical energy less.
The situation as described is impossible to happen.
If there is no friction on this track, at which point would the coaster have the most kinetic energy?
A
B
C
D
Where is the roller coaster gaining potential energy?
A to B
B to C
C to D
The roller coaster is always losing potential energy
A 40-kg person is climbing 3 m up a flight of stairs in 6 seconds. How much work did they do climbing the stairs?
400 J
1200 J
200 J
120 J
A 40-kg person is climbing 3 m up a flight of stairs in 6 seconds. How much power did they exert climbing the stairs?
400 W
1200 W
200 W
120 W
How does conservation of energy explain why something that is falling should speed up?
It gains kinetic energy because it gains potential energy.
It loses kinetic energy because no work was done on it.
It gains kinetic energy because it loses potential energy.
It loses kinetic energy because the Earth gains potential energy.
The ability to do work or cause change:
work
energy
momentum
power
What is mechanical energy?
total kinetic energy
the energy of motion
total kinetic and potential energy
temperature plus heat
Where is the kinetic energy of pendulum at its highest?
at the top of the swing
at the bottom of the swing
at 1/4 of the swing
at 3/4 of the swing
An object has 12.4 J of potential energy and 23.5 J of kinetic energy. What is the mechanical energy of the system?
11.1 J
1.895 J
35.9 J
291.4 J
What is the kinetic energy of an 9 kg bowling ball rolling at 3.30 m/s?
29.7 J
323.4 J
49.005 J
14.85 J
An 80 kg skier stands at the top of a 40 meter slope. What is her gravitational potential energy before she skies down the slope?
3200 J
31,360 J
15,680 J
19.6 J
If you hold a 20 N object 2 m off of the ground, how much work have you done?
40 J of Work
10 J of Work
No Work
18 J of Work
If you drive your 1,000 kg car from sea level up to the Nu'uanu Pali lookout, which is 366 m above sea level, how much will you have increased your car's gravitational potential energy?
3,000,000 J
366,000 J
3,586,800 J
586,800 J
What is the kinetic energy of a 4 kg rock falling through the air at 5 m/s?
10 J
50 J
20 J
200 J
If a rock falls from a cliff, at what point are its kinetic energy and its potential energy the same? Ignore air resistance.
Just as it starts to fall
just before it hits the bottom
halfway down
never
If two rocks are launched through the air at the same speed, but one has twice as much mass as the other, how do their kinetic energies compare?
The kinetic energy of the two rocks is the same because they have the same speed
The rock with the greater mass will only move a small distance and then fall straight to the ground
The two rock could not have the same speed if they have different masses
The rock with the greater mass has more kinetic energy than the rock with less mass even though they are traveling at the same speeds because both mass and speed affect kinetic energy.
You’re watching a volleyball game and someone asks you what type of energy best describe the movement of the volleyball players. Which of the following choices should your answer be in order to be correct?
Chemical
Sound
Mechanical
Potential
Where would a car traveling on a roller coaster track have the most potential energy?
At the bottom
Halfway to the top
at the top
halfway to the bottom
It is always the same
What would happen to the kinetic energy of an object if you doubled the mass?
The kinetic energy would be cut in half
The kinetic energy would double
The kinetic energy would triple
It would stay the same because mass does not effect kinetic energy
If a 2 kg ball is traveling at 4 meters per second, what is its kinetic energy?
1 J
2 J
4 J
8 J
16 J
Which point has the most kinetic energy?
Ball G
Ball F
Ball E
Ball D
Ball A
As a pendulum swings from its highest to lowest position, what happens to its kinetic and potential energy?
Both the potential energy and kinetic energy decrease
The potential energy decreases while the kinetic energy increases
The kinetic energy decreases while the potential energy increases
Both the potential energy and kinetic energy increase
For work to be done on an object,
some force need only be exerted on the object.
the object must move some distance as a result of a force.
the object must move, whether or not a force is exerted on it.
the object must not move.
Energy is the rate at which work is done
True
False
A 35 kg chair is lifted 5 m off the ground. What is its potential energy?
175 J
30 J
1715 J
40 J
What is the kinetic energy of a 1-kilogram ball is thrown into the air with an initial velocity of 30 m/sec?
30 J
450 J
900 J
29 J
