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WorksheetsEnergy, Work, Power and Simple Machines -Test
Total questions: 60
Worksheet time: 14hrs 18mins
Name
Class
Date
1.
What is kinetic energy?
a)
Stored energy of an elastic or springlike object
b)
The attraction between two objects
c)
Energy of motion
d)
Stored energy
2.
Potential Energy is...
a)
Stored energy of an object based on its height off of the ground
b)
Energy stored in molecules like our food
c)
Energy of motion
d)
Stored energy
3.
Conservation is...
a)
The amount of matter in an object
b)
A push or a pull
c)
The idea that energy cannot be created or destroyed, it can only change forms
d)
Stored energy of an elastic or springlike object
4.
Gravitational Potential Energy (GPE) is defined as....
a)
Stored energy of an elastic or springlike object
b)
Stored energy
c)
Stored energy of an object based on its height off of the ground
d)
The attraction between two objects
5.
It takes 20 N of force to move a box a distance of 10 m. How much work is done on the box in Joules?
a)
200 J
b)
20.0J
c)
100 J
d)
10 J
6.
Two factors that determine work are
a)
size of the force, and distance
b)
size of the force, and type of force
c)
mass, and distance
7.
units for work are
a)
netwons
b)
joules
c)
meters
d)
seconds
8.
work transfers
a)
sweat
b)
energy
c)
velocity
d)
effort
9.
if you push a cart with a force of 60 N for 2 m... how much work have you done
a)
120 J
b)
30 J
c)
120 N
d)
30 N
10.
Work done = Force x blank?
a)
a. distance
b)
b. acceleration
c)
c. velocity
d)
d. speed
11.
If you do 40 joules of work lifting a 10N box, how high is the shelf you move it to.
a)
400m
b)
40m
c)
50m
d)
4m
12.
In which of the following situations do your arms do work on books?
a)
holding a heavy stack of books while standing
b)
carrying a heavy stack of books
c)
dropping a stack of books onto a table
d)
picking up a pile of books from the floor
13.
Ms. McDonald holds a desk perfectly still above her head. If she holds the desk at a height of 0.5 meters above her head, and applis 68 Newtons of force to do so, how much work has she done?
a)
34 Joules
b)
0 Joules
14.
How are force and distance related?
a)
As distance increases, force increases.
b)
As distance increases, force decreases.
15.
There is a bell at the top of a tower that is 45 m high. The bell weighs 100 kg. What is the potential energy of the bell?
a)
980 J
b)
441 J
c)
4,500 J
d)
44,100 J
16.
Which of the following has the GREATEST IMPACT on the kinetic energy of an object?
a)
Mass
b)
Velocity
c)
Height
d)
The acceleration due to gravity
17.
A skydiver jumps from a plane and is halfway through her descent. At this point in time she has...
a)
Kinetic Energy
b)
Gravitational Potential Energy
c)
Both Kinetic and Gravitational Potential Energy
d)
She has no energy
18.
Which of the following has the greatest amount of kinetic energy?
a)
A small baby running at 15 m/s
b)
A toddler running at 15 m/s
c)
Mrs. Rewerts running at 15 m/s
d)
Arnold Schwarzenegger running at 15 m/s screaming "Get to the choppa!"
19.
At which point is potential energy greatest
a)
W
b)
X
c)
Y
d)
Z
20.
As a pendulum swings from its highest to lowest position, what happens to its kinetic and potential energy?
a)
Both the potential energy and kinetic energy decrease
b)
The potential energy decreases while the kinetic energy increases
c)
The kinetic energy decreases while the potential energy increases
d)
Bothe the potential energy and kinetic energy increase
21.
At which point is kinetic energy greatest
a)
W
b)
X
c)
Y
d)
Z
22.
When a pendulum swings, at which point is kinetic energy highest:
a)
1
b)
2
c)
3
d)
4
23.
When a pendulum swings, at which point is potential energy at its greatest
a)
1
b)
2
c)
3
d)
4
24.
What kind of energy is in a rock at the edge of a cliff?
a)
Potential
b)
Kinetic
25.
What kind of energy is in gasoline in a car tank (car is not on)?
a)
Potential
b)
Kinetic
26.
What kind of energy is in basketball passing through the hoop?
a)
Potential
b)
Kinetic
27.
Energy can not be created or destroyed, only converted from one form to another.
a)
true
b)
false
28.
P=25 watts
W=5000 Joules
t=???
W=5000 Joules
t=???
a)
200 sec
b)
0.0005 s
c)
125000 s
d)
125 s
29.
A person weighing 600 N gets on an elevator. The elevator lifts the person 6 m in 10 seconds. How much power was used?
a)
360 W
b)
60 W
c)
3600 W
d)
600 W
30.
An engine reaches its top speed from rest in 7.5 s. It is able to perform 250,000 J of work in that time. How much power does this engine have in that time?
a)
0.00003 W
b)
33,333 W
c)
1,875,000 W
d)
1873 W
31.
How much time is needed to produce 720 Joules of work if 90 watts of power is used?
a)
0.125 s
b)
8 s
c)
64800 s
d)
80 s
32.
If 68 W of power is produced in 18 seconds, how much work is done?
a)
1,224 J
b)
0.264 J
c)
3.77 J
d)
12.24 J
33.
What is the definition of power?
a)
the amount of work an object does
b)
the rate at which force is applied
c)
the amount of matter in an object
d)
the rate at which work is done
34.
What is the equation for work?
a)
W = mass * acceleration
b)
W = force * distance
c)
W = force/distance
d)
W = speed/time
35.
What is the equation for power?
a)
P = Work/time
b)
P = Force/time
c)
P = time/distance
d)
P = Work * time
36.
A kid throws a ball with a force of 70N over 1.1 meters. How much work did he do?
a)
77 joules
b)
70 joules
c)
7.7 joules
d)
11 joules
37.
A wheel is a modification of a(n)
a)
screw
b)
lever
c)
inclined plane
d)
wedge
38.
Which of the following is not an inclined plane?
a)
wrench
b)
axe
c)
chisel
d)
ramp
39.
"The total kinetic energies of all particles in an object" describes what kind of energy?
a)
radiant
b)
thermal
c)
electrical
d)
magnetic
40.
A mechanical advantage of 1 indicates ...
a)
you are at an advantage when using the machine
b)
you are unable to determine just by the number value
c)
you are at a disadvantage when using the mcahine
d)
the system is in balance
41.
Inclined planes reduce the ______ to raise a load.
a)
distance
b)
effort
c)
resistance
d)
work
42.
The distance between adjacent threads on a machine bolt is called the ...
a)
fulcrum
b)
joule
c)
pitch
d)
watt
43.
Machines in the "real world" cannot produce as much energy as they receive because of the presence of ...
a)
work
b)
levers
c)
friction
d)
power
44.
Which of the following is an example of KE
a)
A car in a driveway
b)
a bird flying through the air
c)
A rock sitting on a cliff
d)
A couch in your house
45.
A weightlifter presses a 400 N weight 0.5 m over his head in 2 seconds. What is the power of the weightlifter?
a)
400 W
b)
100 W
c)
100N
d)
400 N
46.
16. A medicine ball has a mass of 5 kg and is thrown with a speed of 2 m/s. What is its kinetic energy?
a)
500 J
b)
10 J
c)
2000J
d)
100 J
47.
How much power is required to lift a 2.0 kg object 5 meters in 4.50 seconds?
a)
0.45 Watts
b)
2.22 Watts
c)
21.8 Watts
d)
45.0 Watts
48.
The efficiency of a machine is always less than 100 percent because
a)
a machine cannot have an IMA greater than 1.
b)
some work input is lost to friction.
c)
the work input is too small.
d)
the work output is too great.
49.
Maria's parents asked her to rake the leaves in the backyard. To complete one section of the yard, Maria pulled the rake 10 meters. She applied 100 newtons of force. How much work did the rake do?
a)
1,000 joules
b)
10 joules
c)
1,000 watts
d)
No work was done
50.
Work is best described as _______.
a)
the use of force to either move an object or keep it from moving
b)
the use of energy to move an object some distance in any direction
c)
the use of power to move an object in a specific direction
d)
the use of force to move an object some distance
51.
The energy that comes from electrically charged particles
a)
chemical
b)
light
c)
sound
52.
The ability to do work is
a)
power
b)
energy
c)
thermal
d)
kinetic
53.
The sun uses this type of energy to make light and thermal energy (heat)
a)
electrical
b)
nuclear
c)
sound
d)
chemical
54.
What kind of energy?
a)
Thermal
b)
Chemical
c)
Electrical
d)
Sound
55.
When two or more simple machines are combined, it is called a ___________ machine.
a)
compound
b)
complex
c)
mechanical
56.
Which simple machine is part of the lever family?
a)
pulley
b)
wedge
c)
screw
57.
Mechanical advantage is expressed ...
a)
in newtons squared
b)
in joules
c)
without any units
d)
in joules squared
58.
In a second-class lever, ...
a)
the effort is located between the fulcrum and the resistance
b)
the resistance is located between the fulcrum and the effort
c)
the fulcrum is located between the effort and the resistance
d)
the resistance is located at the end of the lever
59.
The unit for power is the ...
a)
watt
b)
joule
c)
newton
d)
dyne
60.
Energy can cause an object to ______________ the position of its motion.
a)
Energy
b)
Change
c)
Speed
d)
Stored
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