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Energy, Work & Machines Test Review

Total questions: 55

Worksheet time: 4hrs 22mins

Name
Class
Date
1.

How does heat always transfer?

a)

from cold to hot

b)

from hot to cold

c)

from liquid to solid

d)

from gas to liquid

2.
What type of heat transfer does this picture represent? (pot touching burner)
a)
radiation
b)
conduction
c)
convection
d)
sunshine
3.
What kind of heat transfer does this picture represent?
a)
chocolate chip cookies
b)
radiation
c)
conduction
d)
convection
4.
What type of heat transfer does this picture represent?
a)
radiation
b)
conduction
c)
convection
d)
sunburns
5.
What type of heat transfer does this picture represent?
a)
radiation
b)
conduction
c)
convection
d)
hot air balloons
6.
Which of the following energy transformations occur when a lamp that is plugged into a wall socket is functioning correctly?
a)
Chemical to light
b)
Electrical to chemical
c)
Electrical to light
d)
Chemical to electrical
7.
Which of the following shows an energy transformation from chemical energy to electrical to light energy?
a)
A bolt of lightning lights the night sky.
b)
A candle glows brightly in the dark.
c)
A fire in a fireplace lights up a room.
d)
A battery causes a flashlight to shine.
8.
A television works by transforming electrical energy into what other kinds of energy?
a)
Light, thermal, and sound
b)
Thermal, chemical, and solar
c)
Sound, mechanical, and electrical
d)
Light, chemical, and mechanical
9.
Which of the following shows the correct order of the energy transformations that occur when green plants produce their food from the Sun’s energy?
a)
chemical to thermal
b)
light to chemical
c)
thermal to light
d)
chemical to electrical
10.
At which point is potential energy greatest?
a)
W
b)
X
c)
Y
d)
Z
11.
__________ is stored energy. 
a)
Potential
b)
Kinetic
c)
None of the above 
d)
All of the above 
12.
The faster an object moves, the ________ kinetic energy it has. 
a)
more
b)
less
c)
none of the above
d)
same
13.
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 
14.
When a pendulum swings, at which point is kinetic energy highest?
a)
1
b)
2
c)
3
d)
4
15.
When a pendulum swings, at which point is potential energy at its greatest?
a)
1
b)
2
c)
3
d)
4
16.
Conservation of energy states that energy cannot be ________ or ________, but can be altered from one form to another.
a)
created, destroyed
b)
gravity, force
c)
heat, created
17.
What are the two factors that affect kinetic energy?
a)
time and energy
b)
power and mass
c)
mass and speed
d)
time and work
18.
What is the unit of measurement for kinetic energy
a)
Newton
b)
Joule
c)
Watt
d)
Kilogram
19.
What happens to particles as they cool down?
a)
They slow down
b)
Nothing
c)
They don't move
d)
They speed up
20.
What type of material makes the best insulators?
a)
Aluminum
b)
Copper
c)
Styrofoam
d)
Metal
21.
What type of material makes the best conductor?
a)
Food
b)
Wood
c)
Styrofoam
d)
Metal
22.
The product of the net force on an object and distance through which the object is moved
a)
Work
b)
Power
c)
Energy
d)
Acceleration
23.
You push against the back of your friends car that is stuck. You push and be become very tired. Did you do work?
a)
Yes, work was done
b)
No, work wasn't done
24.
What are the units for work?
a)
Joules
b)
Watts
c)
Newtons
d)
Meters
25.
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
26.
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
27.
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
28.
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
29.
An axe is an example of a
a)
pulley
b)
inclined plane
c)
screw
d)
wedge 
30.
A seesaw is an example of a  
a)
wedge
b)
lever 
c)
inclined plane 
d)
pulley 
31.
A device that has two or more simple machines working together 
a)
fulcrum 
b)
pulley
c)
compound (complex) machine 
d)
motor 
32.
Stairs
a)
wedge
b)
pulley
c)
inclined plane
d)
wheel and axle
33.
This device
a)
wedge
b)
lever
c)
incline plane
d)
wheel and axle
34.
What type of simple machine is this?
a)
wheel and axle
b)
gear
c)
lever
d)
inclined plane
35.
The fixed point on the lever is called 
a)
load
b)
resistance
c)
bar
d)
fulcrum
36.
Which of the following does a simple machine do?
a)
allows the users to apply less force over a longer distance
b)
reduce the amount of force needed to do work
c)
change the direction of the applied force
d)
all of the above
37.
Which is an example of someone using a simple machine to do work?
a)
a boy runs across a football field
b)
a banker counts money
c)
a mother pushes a stroller up a ramp
d)
a girl eats a sandwich
38.
Where should the fulcrum be placed in order for the student to use the least amount of effort possible? 
a)
point A
b)
point B
c)
point C
d)
point D
39.
True or false
You do work only when you exert a force on an object and move it
a)
true
b)
false
40.

In the illustration, work is done in

a)

A & B only

b)

B & D only

c)

A & C only

d)

All examples show work

41.

Machines reduce work (by using a machine, you do less work and the machine does more work)

a)

true

b)

false

42.

Machines make work easier by

a)

changing the size of a work needed or the direction of power

b)

reducing the amount of work needed

c)

changing the size of a force needed or the direction of force

43.

1st, 2nd, or 3rd class lever?

a)

1st

b)

2nd

c)

3rd

44.

1st, 2nd, or 3rd class lever

a)

1st

b)

2nd

c)

3rd

45.

A lever has an effort force of 18 N and a resistance force of 100 N. What is the mechanical advantage?

a)

5.6

b)

4

c)

1800

d)

18

46.

A ramp has a length of 17 m and a height of 5 m. What is the mechanical advantage?

a)

2.5

b)

3

c)

3.4

d)

4.2

47.

What is the MA of the pulley in the picture?

a)

1

b)

2

c)

3

d)

4

48.

What is the MA of the pulley in the picture?

a)

1

b)

2

c)

3

d)

4

49.

An inclined plane reduces teh effort force by (think about what you did in the simple machine lab)

a)

increasing the distance through which the force is applied

b)

increasing the work

c)

reducing the effort distance

d)

reducing the work

50.

Casey is using a lever system to lift a box. Which of the following should Casey do to make the box easier to lift?

a)

Casey should move the fulcrum closer to the box.

b)

Casey should move the box on top of the fulcrum

c)

Casey should move the fulcrum farther from the box

d)

Casey should move the box closer to the edge of the lever

51.

The specific heat of copper is 0.385 J/g℃. Which equation would you use to calculate the amount of heat needed to raise the temperature of 0.75 g of copper from 7℃ to 29℃?

Q=mcΔt

a)

Q=0.385 J/g℃ x (29℃-7℃)

b)

Q=.75g x 0.385 J/g℃ x 29℃

c)

Q=.75g x 0.385 J/g℃ x 22℃

d)

Q=.75 x 0.385 J/g℃ x 7℃

52.

Convert -83℃ to Kelvin (℃ + 273= K)

a)

.356 K

b)

273 K

c)

183 K

d)

190 K

53.

Using the table, determine which substance can absorb the MOST energy in a temperature increase of 1℃. `

a)

liquid water

b)

aluminum

c)

gold

d)

lead

54.

Use the chart to determine the amount of heat released when a 10 kg block of silver is cooled from 90℃ to 60℃.

Q=mcΔt`

a)

70,200 J

b)

-70,200 J

c)

702 J

d)

-702 J

55.

Is work being done?

a)

yes

b)

no

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