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Worksheets3rd Six Weeks Exam - Energy
Total questions: 100
Worksheet time: 4hrs 2mins
Name
Class
Date
1.
What is it called when one form of energy is changed to another form?
a)
Energy change
b)
Energy conversion
c)
Electrical conversion
d)
Force change
2.
What kind of energy are you taking in when eating food?
a)
thermal
b)
sound
c)
chemical
d)
electrical
3.
Friction can create...
a)
thermal energy
b)
kinetic energy
c)
nuclear fission
d)
electrical energy
4.
What is energy?
a)
the ability to do work
b)
mass and volume
5.
What is the energy of motion?
a)
radiant
b)
kinetic
c)
gravitational
d)
potential
6.
Any energy conversion will always result in what form of energy?
a)
potential
b)
sound
c)
radiant
d)
thermal
7.
what is the energy of moving electrons?
a)
Nuclear
b)
thermal
c)
sound
d)
electrical
8.
When is kinetic energy GREATEST on a roller coaster?
a)
at the top of the highest hill
b)
at the bottom of the highest hill
c)
at the end of the ride
d)
at the beginning of the ride
9.
Energy...
a)
is the ability to do work or cause a change
b)
is all the movement in the universe
c)
cannot be created or destroyed
d)
all of the above
10.
What type of energy is stored inside a battery?
a)
elastic potential energy
b)
gravitational potential energy
c)
chemical potential energy
d)
kinetic energy
11.
Which is an example of potential energy?
a)
A car sitting at the top of a hill
b)
A kite flying in the air
c)
A fox chasing a mouse
d)
A bowling ball rolling
12.
When a pendulum swings, at which point is potential energy at its greatest
a)
1
b)
2
c)
3
d)
4
13.
What energy is pulling an arrow back
a)
kinetic energy
b)
potential energy
c)
energy
14.
A battery converts what type of energy to another?
a)
sound to kinetic
b)
light to heat
c)
mechanical to electrical
d)
chemical to electrical
15.
Wind turbines and windmills convert what energy to another?
a)
Kinetic to electric
b)
Gravitational potential to electric
c)
Mechanical to potential
d)
Thermal to sound
16.
The formula for work is:
a)
d = r x t
b)
p = m x v
c)
f = m x a
d)
w = d x f
17.
The faster an object moves, the ________ kinetic energy it has.
a)
more
b)
less
c)
none of the above
d)
all of the above
18.
Gravitational potential energy depends on the ________ and ________ of the object.
a)
Height and mass
b)
Friction and movement
c)
Mass and Movement
d)
Height and Friction
19.
At which point is potential energy greatest?
a)
W
b)
X
c)
Y
d)
Z
20.
A force that opposes motion
a)
Force
b)
Friction
c)
Gravity
d)
Magnetism
21.
A 4 kg rock is sitting 5 m above the ground. How much potential energy does it have?
a)
20J
b)
50J
c)
196J
d)
980J
22.
What is the kinetic energy of a 130 kg bicycle/bicyclist traveling at 3 m/s?
a)
540 J
b)
585 J
c)
390 J
d)
3820 J
23.
How much kinetic energy does a 100 kg person have when he runs at 10 m/s?
a)
50 J
b)
500 J
c)
5000 J
d)
10000 J
24.
A cheetah can run briefly with a speed of 31m/s. Suppose a cheetah with a mass of 47 kg runs at this speed. What is the cheetah’s kinetic energy?
a)
22583.5 J
b)
728.5 J
c)
1457 J
d)
0.75 J
25.
One of the tallest radio towers is in Fargo, North Dakota. The tower is 639m tall, or about 44 percent taller than the Sears Tower in Chicago. If a bird lands on top of the radio tower, so that the gravitational potential energy associated with the bird is 2033J, what is its mass?
a)
3.08 kg
b)
31.17 kg
c)
0.32 kg
d)
13.13 kg
26.
In 1993, Cuban athlete Javier Sotomayor set the world record for the high jump. The gravitational potential energy associated with Sotomayor’s jump was 1970J. Sotomayor’s mass was 82kg. How high did he jump?
a)
237.3 m
b)
15.83 km
c)
24 m
d)
2.45 m
27.
The kinetic energy of a golf ball is measured to be 143.3J. If the golf ball has a mass of about 47g, what is its speed?
a)
2.46 m/s
b)
3367.55 m/s
c)
1.52 m/s
d)
6.09 m/s
28.
The kinetic energy of a golf ball is measured to be 143.3J. If the golf ball has a mass of about 47g, what is its speed?
a)
2.46 m/s
b)
3367.55 m/s
c)
1.52 m/s
d)
6.09 m/s
29.
Though slow on land the leatherback turtle holds the record for the fastest water speed of any reptile: 9.78m/s. It is also among the largest of reptiles. Suppose the largest leatherback yet discovered were to swim at a speed of 9.78m/s. If its kinetic energy was 60800J, what was its mass?
a)
6216.76 J
b)
12433.53 kg
c)
112433.53 kg
d)
1271.53 kg
30.
A 40 kg crate is picked up by a crane to a height of 50m. The crate falls. What is the velocity of the crate just before it hits the ground?
a)
2000 Joules
b)
19,600 Joules
c)
19,600 m/s
d)
31.3 m/s
31.
When my velocity triples, my kinetic energy increases by ______ times.
a)
9
b)
3
c)
1.5
d)
4.5
32.
If both of these balls are traveling down a bowling lane at the SAME speed, which one would would have more kinetic energy?
Ball A = 500kg B = 100kg
Ball A = 500kg B = 100kg
a)
A
b)
B
33.
A force exerted over a distance to move an object is ______________________.
a)
power
b)
work
c)
momentum
d)
Watt
34.
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)
Both the potential energy and kinetic energy increase
35.
The unit used to measure work is the
a)
Watt
b)
Newton
c)
Joule
d)
meter
36.
Any device that makes work easier is called a ______________________.
a)
Joule
b)
prop
c)
lever
d)
machine
37.
A 5000N block is lifted 10 m. How much work was done?
a)
50000 J
b)
5000 J
c)
500 J
d)
50 J
38.
Work done = Force x _________
a)
a. distance
b)
b. acceleration
c)
c. velocity
d)
d. speed
39.
W=125 J
d=10 m
F=???
d=10 m
F=???
a)
12.5 N
b)
1250 N
c)
0.08 N
d)
135 N
40.
If 150 Joules of work is needed to move a box 10 meters, what force was used?
a)
1500 N
b)
15 N
c)
1.5 N
d)
150 N
41.
If 68 Joules were necessary to move a 4 Newton crate, how far was the crate moved?
a)
272 m
b)
17 m
c)
4.05 m
d)
272 cm
42.
Is work being done if I am trying to pick up a box but can not lift it?
a)
yes
b)
no
43.
A girl pushes a box across the floor. Did she do work?
a)
no
b)
yes
44.
Which situation is work not done?
a)
lifting a 20 pound box off the floor
b)
holding a 20 pound box above the floor
c)
sliding a 20 pound box across the floor
d)
sliding a 20 pound box up an inclined plane
45.
W= 20 Joules
F= .5 Newtons
D=??
F= .5 Newtons
D=??
a)
40 Newtons
b)
10 Newtons
c)
40 Kilometers
d)
10 Kilometers
46.
Which is doing work?
a)
pushing a wall
b)
holding a box
c)
picking up a pencil
d)
sitting in a chair
47.
How much work is produced when 350 N is used to move a car 5 m?
a)
70 J
b)
1750 J
c)
355 J
d)
175 J
48.
Which of the following is the best example of work being done.
a)
doing homework
b)
lifting a box
c)
pushing a stationary box
d)
holding a box
49.
Force is a _____ or _______
a)
simple complex
b)
push pull
c)
up down
d)
in out
50.
This is work divided by time.
a)
Work
b)
Distance
c)
Power
51.
An example of work is holding a heavy bag
a)
True
b)
false
52.
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
53.
A 5000N block is lifted 10 m. How much work was done?
a)
50000 J
b)
5000 J
c)
500 J
d)
50 J
54.
What is the unit used to measure Power?
a)
Joule
b)
Watt
c)
Newton
d)
Pascal
55.
When gliding across the ice while ice skating, how much work are you doing?
a)
0 J
b)
more than 0 J
c)
less than 0 J
d)
you need more info
56.
A job is done slowly, and an identical job is done quickly. Both jobs require the same amount of ___, but different amounts of _____
a)
work, energy
b)
power, work
c)
work, power
d)
force, work
57.
Friction causes energy to be transformed from KE to what?
a)
PGE
b)
chemical
c)
thermal
d)
elastic
58.
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
59.
What is power?
a)
transfer a force through a distance
b)
the rate of speed
c)
the rate of work being done
d)
transfer of space over time
60.
What is the equation for power?
a)
P = Work/time
b)
P = Force/time
c)
P = time/distance
d)
P = Work * time
61.
What is being transferred as you do work?
a)
Energy
b)
Heat
c)
Power
d)
Gravitational Potential Energy
62.
What is g on Earth?
a)
9.8 m/s/s
b)
9.8 m/s
c)
42 m*s
d)
42 m/s/s
63.
Work is done on an object when the object moves in the SAME direction in which the force is applied.
a)
True
b)
False
64.
If you pull at an angle instead of in the direction in which the object moves, MORE of your force does work.
a)
True
b)
False
65.
The more POWER you use to move an object, the more work you do.
a)
True
b)
False
66.
If you lift a box from the floor to a height of 1m and then carry the for for 10m, you do work only when you CARRY the box.
a)
True
b)
False
67.
Power is the RATE at which work is done.
a)
True
b)
False
68.
It took 50 joules to push a chair 5 meters across the floor. With what force wast the chair pushed?
a)
250N
b)
10N
69.
A set of pulleys is used to lift a piano weighing 1,000 newtons. The piano lifted 3 meters in 60 seconds How much power is used?
a)
16.67 watts
b)
50 watts
70.
What is the power of a kitchen blender if it can perform 3,750 joules of work in 15 seconds?
a)
56, 250 watts
b)
250 watts
71.
Which wastes more energy?
a)
A more efficient machine
b)
A less efficient machine
72.
Answer the following:
PE= KE
a. What is the kinetic energy of a 1-kilogram ball is thrown into the air with an initial velocity of 10 m/sec?
b. How high into the air did the ball travel?
PE= KE
a. What is the kinetic energy of a 1-kilogram ball is thrown into the air with an initial velocity of 10 m/sec?
b. How high into the air did the ball travel?
a)
50, 5.1
b)
5, 51
c)
100, 5.1
d)
100, 51
73.
What is the efficiency of a machine when the input is 263 J and the output is 142 J.
a)
1.85 %
b)
18.5 %
c)
5.39 %
d)
53.9 %
74.
Ratio to work out to work in
a)
Efficiency
b)
Law of Conservation of Energy
c)
Transformation
d)
Lumens
75.
Heat energy caused by friction
a)
chemical
b)
electrical
c)
mechanical
d)
thermal
76.
When a drive gear is larger than a driven gear the output is.....
a)
More Speed
b)
More Torque
c)
Less Speed
d)
Change in angle
77.
When a drive gear is smaller than the driven gear the result is....
a)
More Speed
b)
More Torque
c)
Less Torque
d)
More Angle
78.
A gear ratio of 10:1 indicates
a)
A train with increased torque
b)
A train with increased speed
c)
A train with decreased angle
d)
A train with reversed angle
79.
True or False: Gears next to each other turn in the same direction.
a)
True
b)
False
80.
To INCREASE speed of rotation, you can ____________________.
a)
add more gears
b)
change from a LARGE gear to a SMALL gear
c)
turn the handle less times
d)
change from a SMALL gear to a LARGE gear
81.
When gears are the same size they turn the same number of times.
a)
True
b)
False
82.
Chain drive gears turn in the __________ direction.
a)
Opposite
b)
Same
c)
Oscilating
d)
Linear
83.
In order for gears to work, gear teeth must __________ be in contact.
a)
rarely
b)
typically
c)
occasionally
d)
always
84.
Two meshed gears will turn in what direction from each other?
a)
Same
b)
Opposite
85.
A gear ratio of 1:5 indicates...
a)
A train with increased speed
b)
A train with increased torque
c)
A train with an increased angle
d)
A train with an changed direction
86.
To INCREASE speed of rotation, you can ____________________.
a)
add more gears
b)
change from a LARGE gear to a SMALL gear
c)
turn the handle less times
d)
change from a SMALL gear to a LARGE gear
87.
Which of these would be the best lubricant to reduce friction on your bicycle gears?
a)
oil
b)
sand
c)
water
88.
Where might you find gears?
a)
tires
b)
clock
c)
chopsticks
d)
swimming pool
89.
a pulley is a wheel and axle or shaft that supports movement or change of direction.
a)
true
b)
false
90.
a movable pulley
a)
has more force required than the load
b)
is a block and tackle
c)
can move freely up and down
d)
consists only of rope
91.
a pulley system consists of
a)
rope
b)
cable
c)
chain
d)
all of the obove
92.
True or False? pulley systems can have one to three ropes on one system
a)
false
b)
true
93.
a pulley system can
a)
have infinite pulleys
b)
have zero pulleys
c)
pull buildings out of the ground
d)
be classified as a screw
94.
Mechanical advantage is a measure of how much a machine multiplies the input
a)
efficiency.
b)
force.
c)
power.
d)
work.
95.
What is the mechanical advantage of the block and tackle used to lift the bale of cotton?
a)
1
b)
2
c)
3
d)
4
96.
Which of the following decreases when an object is lifted using a movable pulley?
a)
The distance the object moved
b)
The amount of force needed
c)
The length of the pulley’s rope
d)
The pull of gravity on the object
97.
The diagram provided shows a fixed pulley system.A fixed pulley does not change the amount of effort needed to lift the load, but it does change the
a)
direction of the force.
b)
weight of the load.
c)
volume of the force.
d)
shape of the load.
98.
The diagram provided shows a 50 N load attached to a movable pulley.What amount of force must act on the left rope of the pulley in order to lift the load?
a)
Less than 25 N
b)
25 N
c)
50 N
d)
More than 50 N
99.
The diagram shows a 225 N load attached to a movable pulley. What amount of force is required to lift the load? Record your answer on the grid below.
a)
0.1125N
b)
112.5N
c)
11.25N
d)
1.125N
100.
What is the effort required to lift the load and how far will the rope need to be pulled if the load is to be lifted 20 feet?
a)
150 N and 20 feet
b)
300 N and 10 feet
c)
75 N and 40 feet
d)
75 N and 20 feet
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