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WorksheetsCh. 4, 5, and 6 Energy, Work, and Power Review
Total questions: 42
Worksheet time: 16mins
Name
Class
Date
1.
Define Potential Energy.
a)
Energy of motion
b)
Energy based on height
c)
Energy of food
d)
Energy of heat
2.
Define kinetic energy.
a)
Energy of motion
b)
Energy based on position
c)
Energy of food
d)
Energy of heat
3.
What two variables are used to calculate kinetic energy?
a)
mass and weight
b)
mass and velocity
c)
velocity and height
d)
weight and height
4.
Besides gravity, what two variables are used to calculate gravitational potential energy?
a)
mass and velocity
b)
velocity and height
c)
weight and height
d)
mass and height
5.
Define mechanical energy.
a)
All the energy in the universe
b)
The total potential and kinetic energy
c)
The energy of heat
d)
The energy of objects in motion
6.
What causes kinetic energy to change into thermal energy?
a)
heat
b)
friction
c)
going too fast
d)
gravity
7.
What happens to the mechanical energy of a falling object?
a)
Increases
b)
Decreases
c)
Stays the same
d)
Not enough information
8.
Define the law of conservation of energy.
a)
Energy can be destroyed
b)
Energy can be created
c)
Energy can be created and destroyed
d)
Energy cannot be created or destroyed
9.
Define power.
a)
Rate at which work is done
b)
The efficiency of a machine
c)
Amount of force applied across a distance
10.
What is transferred when work is done on an object?
a)
Force
b)
Distance
c)
Energy
d)
Heat
11.
What is the unit for energy?
a)
Joules
b)
Newtons
c)
Kilograms
d)
Meters/second
12.
What is the formula for kinetic energy?
a)
KE=1/2mv
b)
KE=mv
c)
KE=1/2mv2
d)
KE=mv2
13.
What is the formula for potential energy?
a)
PE=mg
b)
PE=mgh
c)
PE=mg/h
d)
PE=1/2mgh
14.
What is the formula for work?
a)
W=1/2Fd
b)
W=mv
c)
W=Fd
d)
W=F/d
15.
What is the unit for work?
a)
Watts
b)
Joules
c)
Newtons
d)
meters
16.
What is the formula for power?
a)
P=Wt
b)
P=t/W
c)
P=W/t
d)
P=Fd
17.
What is the unit for power?
a)
Watt
b)
Joules
c)
Newtons
d)
Seconds
18.
What happens in nuclear fusion?
a)
Two nuclei split apart
b)
Mass is transformed into energy
c)
Mass is transformed into light
d)
Mass is transformed into heat
19.
What is the difference between fusion and fission?
a)
Fusion-Two atoms combine, Fission-Nuclei are broken apart
b)
Nothing, they are the same thing
c)
Fusion-forms energy, Fission-removes energy
d)
Fusion-nuclei are broken apart, Fission-two atoms combine
20.
What is a device that converts thermal energy into mechanical energy?
a)
Mechanical Advantage
b)
Heat Engine
c)
Heat Converter
d)
Heat Transformer
21.
What type of matter does convection occur in?
a)
Gases
b)
Liquids
c)
Solids and Liquids
d)
Liquids and Gases
22.
Metals are good conductors of heat.
a)
True
b)
False
23.
What type of energy does not require any matter to travel?
a)
Convection
b)
Conduction
c)
Radiation
24.
What unit is heat measured in?
a)
Meters
b)
Watts
c)
Newtons
d)
Joules
25.
What is the transfer of thermal energy by collisions between molecules?
a)
Conduction
b)
Convection
c)
Radiation
26.
What is the transfer of energy in fluids that occurs by changes in temperature?
a)
Conduction
b)
Convection
c)
Radiation
27.
An example of conduction would be
a)
Cooking on the stove
b)
A bonfire
c)
Boiling water
d)
The Sun
28.
An example of convection would be
a)
Cooking on the stove
b)
A bonfire
c)
The Sun
d)
Ironing your clothes
29.
An example of radiation would be
a)
Cooking on the stove
b)
Ironing your clothes
c)
A bonfire
d)
The Sun
30.
What does the specific heat of a material tell you?
a)
how easy it is to heat
b)
how to heat it
c)
how to cool it
d)
how much of the material can be heated
31.
Which material would be easier to heat up: High Specific Heat or Low Specific Heat?
a)
High Specific Heat
b)
Low Specific Heat
c)
They would heat the same
32.
How much energy would be required to heat 200 kg of water from 10°C to 30°C? (C=4184 J/kg*°C)
a)
16,736,000 J
b)
15,476,000 J
c)
14,658,000 J
d)
17,937,000 J
33.
How much energy is needed to heat 56 kg of copper from 70°C to 110°C? (C=385 J/kg*°C)
a)
978,400 J
b)
768,900 J
c)
862,400 J
d)
673,800 J
34.
It takes 450,000 J of energy to heat aluminum from 10°C to 85°C. Find the mass. (C=897 J/kg*°C)
a)
7.85 kg
b)
8.45 kg
c)
6.69 kg
d)
5.27 kg
35.
How fast is a ball rolling if it contains 86 J of kinetic energy and has a mass of 3 kg?
a)
258 m/s
b)
129 m/s
c)
57.3 m/s
d)
7.57 m/s
36.
A 15 kg bird sits on a fence 5 meters from the ground. What is the bird's potential energy?
a)
75 J
b)
735 J
c)
75 N
d)
735 N
37.
A baseball has a mass of 3.2 kg and is traveling at 8.4 m/s. What is its kinetic energy?
a)
26.88 J
b)
13.44 J
c)
225.8 J
d)
112.9 J
38.
A crunch bar located 1.5 m high has a potential energy of 7.35 J. What is its mass?
a)
11.025 kg
b)
0.5 kg
c)
4.9 kg
d)
0.75 kg
39.
When moving a stove you exert a force of 300 N and push it 10 m. How much work is being done?
a)
30 J
b)
3000 J
c)
3 J
d)
300 J
40.
If 68 Joules of work were necessary to move a 4 Newton crate, how far was the crate moved?
a)
17 m
b)
272 m
c)
0.27 m
d)
0.0625 m
41.
How much power is generated when doing 500 J of work in 25 s.
a)
12500 W
b)
20 W
c)
20 J
d)
12500 J
42.
How much time is needed to produce 720 Joules of work if 90 watts of power is used?
a)
64800 s
b)
630 s
c)
8 s
d)
0.125 s
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