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WorksheetsWork and Energy Review
Total questions: 23
Worksheet time: 12mins
Name
Class
Date
1.
What is the source of almost all energy on Earth?
a)
Earth’s hot core
b)
the Sun
c)
stored carbon
d)
moving water
2.
When a person strikes and lights a match, potential energy in the match is transformed into which types of energy?
a)
electrical and thermal
b)
thermal and radiant
c)
radiant and nuclear
d)
nuclear and kinetic
3.
What energy transformation takes place when energy from the wind is used to spin a turbine?
a)
nuclear energy transformed to electrical energy
b)
chemical energy transformed to electrical energy
c)
radiant energy transformed to mechanical energy
d)
kinetic energy transformed to mechanical energy
4.
As a person pushes a box across a floor, the energy from the person’s moving arm is transferred to the box, and the box and the floor become warm. During this process, what happens to energy?
a)
It is increased.
b)
It is conserved.
c)
It is decreased.
d)
It is created.
5.
Which set of terms best defines what affects kinetic energy and potential energy, respectively?
a)
position, gravity
b)
gravity, velocity
c)
velocity, height
d)
height, position
6.
Seema knows the mass of a basketball. What other information is needed to find the ball’s potential energy?
a)
the volume and height the ball reaches
b)
the volume and shape of the ball
c)
acceleration due to gravity and the height the ball reaches
d)
acceleration due to gravity and the shape of the ball
7.
If the kinetic and potential energy in a system are equal, then the potential energy increases. What happens as a result?
a)
Total energy increases.
b)
Stored energy decreases.
c)
Energy of motion decreases.
d)
Total energy decreases.
8.
Which is occurring when work is being done?
a)
Energy is being reverted.
b)
Energy is being decreased.
c)
Energy is being increased.
d)
Energy is being transferred.
9.
What is the unit of measure for energy?
a)
watt
b)
newtons
c)
joules
d)
meters per second
10.
When a spring is compressed, the energy changes from kinetic to potential. Which best describes what is causing this change?
a)
work
b)
power
c)
gravitational energy
d)
chemical energy
11.
Which two types of potential energies would be types of mechanical energies?
a)
electrical and kinetic
b)
nuclear and chemical
c)
radiant and thermal
d)
elastic and gravitational
12.
When Javier touches a hot mug of tea, energy is transferred from the surface of the mug to his hand. What kind of energy is this?
a)
nuclear
b)
radiant
c)
thermal
d)
chemical
13.
Which simple machine is best used to split apart an object?
a)
a screw
b)
a lever
c)
a wedge
d)
a pulley
14.
What is the mechanical advantage of a pulley?
a)
0.5
b)
1
c)
1.5
d)
2
15.
How does using a ramp make work easier when loading a piano onto a truck three feet above the ground?
a)
It allows a larger force to be applied over a shorter distance.
b)
It allows a larger force to be applied over a longer distance.
c)
It allows a smaller force to be applied over a shorter distance.
d)
It allows a smaller force to be applied over a longer distance.
16.
Which simple machines make up a wheelbarrow?
a)
a pulley and an inclined plane
b)
a wheel and axle and a lever
c)
a pulley and a wheel and axle
d)
a lever and a wedge
17.
Which statement describes how a machine can help make work easier?
a)
It can put out more force than the input force by decreasing the distance over which force is applied.
b)
It can increase the amount of work performed if the output force is in the same direction as the input force.
c)
It can apply a greater output force over a greater distance compared to the input force and distance.
d)
It can increase the distance over which output force acts by applying less output force than input force.
18.
Which refers to the ratio of output force to input force of a machine?
a)
mechanical advantage
b)
average strength
c)
total power
d)
energy requirement
19.
A machine has an efficiency of 80%. How much work must be done on the machine so to make it do 50,000 J of output work?
a)
12,500 J
b)
40,000 J
c)
62,500 J
d)
90,000 J
20.
What is needed for work to be done?
a)
A force must push on an object without moving it.
b)
A force must pull on an object without moving it.
c)
A force must cause an object to move along the same direction as the force.
d)
A force must act on an object while an equal force acts oppositely on the object.
21.
Adita lifts a book from the floor, carries it across the room, and places it on a high shelf. When is Adita doing work on the book?
a)
She does work on the book at no time during this process.
b)
She does work only while she carries the book across the room.
c)
She does work from the moment she touches the book until she lets it go.
d)
She does work as she picks up the book and as she lifts it to the shelf.
22.
Which term is the product of force and distance?
a)
power
b)
work
c)
net force
d)
acceleration
23.
A powered winch is used to pull a sailboat to shore. The winch uses a 900 W motor.
If the motor is used for 30 s, how much work does it do? (Power: P = W/t)
a)
0.03 J
b)
30 J
c)
960 J
d)
27,000 J
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