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WorksheetsEnergy Review
Total questions: 46
Worksheet time: 58mins
Which statement describes the kinetic energy and total mechanical energy of a block as it is pulled at constant speed up an incline?
Kinetic energy decreases and total mechanical energy increases
Kinetic energy decreases and total mechanical energy remains the same
Kinetic energy remains the same and total mechanical energy increases
Kinetic energy remains the same and total mechanical energy remains the same
A 75-kilogram bicyclist coasts down a hill at a constant speed of 12 meters per second. What is the kinetic energy of the bicycle?
4.5 x 102 J
9.0 x 102 J
5.4 x 102 J
1.1 x 102 J
An electrical generator in a science classroom makes a lightbulb glow when a student turns a hand crank on the generator. During its operation, this generator converts
chemical energy to electrical energy
mechanical energy to electrical energy
electrical energy to mechanical energy
electrical energy to chemical energy
A block weighing 40 newtons is released from rest on an incline 8 meters above the horizontal. If 50 joules of heat is generated as the block slides down the incline, the max KE of the block at the bottom of the incline is
50 J
270 J
320 J
3100 J
A child, starting from rest at the top of a playground slide, reaches a speed of 7.0 meters per second at the bottom of the slide. What is the vertical height of the slide? [Neglect friction.]
0.71 m
1.4 m
2.5 m
3.5 m
Two students of equal weight go from the first floor to the second floor. The first student uses an elevator and the second student walks up a flight of stairs. Compared to the gravitational potential energy gained by the first student, the gravitational potential energy gained by the second student is
less
greater
the same
During an emergency stop, a 1.5 x 103-kilogram car lost a total of 3.0 x 105 joules of kinetic energy. What was the speed of the car at the moment the brakes were applied?
10 m/s
14 m/s
20 m/s
25 m/s
While riding a chairlift, a 55-kilogram skier is raised a vertical distance of 360 meters. What is the total change in the skier's gravitational potential energy?
5.4 x 101 J
5.4 x 102 J
2.0 x 104 J
2.0 x 105 J
A book of mass m falls freely from rest to the floor from the top of a desk of height h. What is the speed of the book upon striking the floor?
√(2gh)
2gh
mgh
mh
An object weighing 15 newtons is lifted from the ground to a height of 0.22 meter. The increase in the object's gravitational potential energy is approximately
310 J
32 J
3.3 J
0.34 J
Which graph best represents the relationship between the kinetic energy, KE, and the velocity of an object accelerating in a straight line?
(1)
(2)
(3)
(4)
The graph represents the kinetic energy, gravitational potential energy, and total mechanical energy of a moving block. Which best describes the motion of the block?
accelerating on a flat horizontal surface
sliding up a frictionless incline
fall freely
being lifted at constant velocity
A 60-kilogram runner has 1920 joules of kinetic energy. At what speed is she running?
5.66 m/s
8.00 m/s
32.0 m/s
64.0 m/s
As a ball falls freely (without friction or air resistance) roward the ground, its total mechanical energy
decreases
increases
remains the same
The gravitational potential energy, with respect to Earth, that is possessed by an object is dependent on the object's
acceleration
momentum
position
speed
A pendulum is pulled to the side and released from rest. Which graph best represents the relationship between the gravitational potential energy of the pendulum and its displacement from its point of release?
(1)
(2)
(3)
(4)
As shown in the diagram, a student exerts an average force of 600 newtons on a rope to lift a 50-kilogram crate a vertical distance of 3 meters. Compared to the work done by the student, the gravitational potential energy gained by the crate is
exactly the same
330 J less
330 J more
150 J more
Using the graph, what is the total work done over 4.0 meters?
5.0 J
7.5 J
120 J
180 J
Which graph best represents the relationship between the GPE of an object near the surface of the Earth and its height above Earth's surface?
(1)
(2)
(3)
(4)
A horizontal force of 5.0 newtons acts on a 3.0 kilogram mass over a distance of 6.0 meters along a horizontal, frictionless surface. What is the change in kinetic energy of the mass during its movement over the 6.0-meter distance?
6.0 J
15 J
30 J
90 J
Which combination of fundamental units can be used to express energy?
kg m/s
kg m2/s
kg m/s2
kg m2/s2
The table lists the mass and speed of each of 4 objects. Which two objects have the same kinetic energy?
A and D
B and D
A and C
B and C
An object is thrown vertically upward. Select the pair of graphs that best represents the object's kinetic energy and gravitational potential energy as functions of displacement while it rises?
(1)
(2)
(3)
(4)
An object falls freely near Earth's surface. Which graphs best represents the relationship between the object's kinetic energy and its time of fall?
(1)
(2)
(3)
(4)
A wound spring provides the energy to propel a toy car across a level floor. At time ti, the car is moving at speed vi across the floor and the spring is unwinding, as shown below. At time tf, the spring has fully unwound and the car has coasted to a stop. Select the statement that best describes the transformation of energy that occurs between times ti and tf.
GPE at ti is converted to internal energy at tf
PEs at ti is converted to kinetic energy at tf
Both PEs and KE at ti are converted to Q at tf
Both KE and Q at ti are converted to PEs at tf
Which pair of quantities can be expressed using the same units?
work and kinetic energy
power and momentum
impulse and potential energy
acceleration and weight
If the speed of a moving object is doubled, the kinetic
energy of the object is
halved
doubled
unchanged
quadrupled
The diagram represents a 155-newton box on a ramp. Applied force F causes the box to slide from point A to point B. What is the total amount of gravitational potential energy gained by the box?
28.4 J
279 J
868 J
2740 J
When a roller coaster is at the top of a hill it has
high potential energy
high kinetic energy
low potential energy
equal amounts of kinetic and potential energy
Kinetic energy depends on
mass and height
height and speed
mass and speed
mass and force
Potential energy depends on
mass and height
height and speed
mass and speed
height and force
Energy and work are measured in
kilograms
meters
Joules
m/s
