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Unit 5 Work & Machines

Total questions: 131

Worksheet time: 11hrs 55mins

Name
Class
Date
1.

What is needed to calculate work?

a)

time and distance

b)

speed and distance

c)

force and direction

d)

acceleration and velocity

2.

Is this an example of work?

a)

Yes

b)

No

3.

What is the unit of measurement for work?

a)

meters

b)

newtons

c)

m/s

d)

Joules

4.

You have to push with 15 N of force to move it 10 meters. How much work do you do?

a)

15 Joules

b)

150 Joules

c)

1.5 Joules

d)

.67 Joules

5.

500 J of work is done by a person who uses a force of 50N to move a box, how far does it go?

a)

10 m

b)

0.1 m

c)

25,000 m

d)

10 J

6.

Newtons are the unit for _____________.

a)

Work

b)

Distance

c)

Acceleration

d)

Force

7.

A push or a pull

a)

Work

b)

Force

c)

Acceleration

d)

Speed

8.

For work to be done on an object, the direction and force have to be going the same direction.

a)

True

b)

False

9.

Picking up a box is an example of____________

a)

Work

b)

Not Work

10.

Pushing a box across the floor is an example of

a)

Work

b)

Not Work

11.

You exert 200 J of work by pulling on an object with 20 N of force. What distance is the object moved?

a)

.01 m

b)

10 m

c)

10 J

d)

4,000 m

12.

The unit for energy and work is

a)

meters

b)

joules

c)

newtons

d)

watts

13.

Energy is

a)

stored work

b)

is destroyed when used

c)

can not be changed into another form of energy

d)

measured in newtons

14.

_____________ is the rate of doing work.

a)

Conservation of energy

b)

Joules

c)

Energy

d)

Power

15.

Power is measured in ___________.

a)

meters

b)

joules

c)

newtons

d)

watts

16.

You do 40 Joules of work in 8 seconds. How much power did you exert?

a)

0.2 watts

b)

320 watts

c)

5 watts

17.

The law of Conservation of Energy says________

a)

energy is constantly created

b)

energy can not be created or destroyed instead it changes from one form to another

c)

energy can not change forms

18.
Force is a _____ or _______
a)
simple    complex
b)
push     pull
c)
up      down
d)
in      out
19.
Which one is a unit of distance?
a)
meter (m)
b)
gram (g)
c)
liter (L)
d)
Joule (J)
20.
Which one is a unit of mass?
a)
meter (m)
b)
gram (g)
c)
Joule (J)
d)
Newton (N)
21.
The unit used to measure work is the 
a)
Watt
b)
Newton
c)
Joule
d)
meter
22.
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
23.
What is work?
a)
A push or pull.
b)
When the object moves in the same direction in which the force is exerted.
c)
A change in energy.
d)
The rate at which energy is transferred.
24.
A force exerted over a distance to move an object is ______________________.
a)
power
b)
work
c)
momentum
d)
Watt
25.
An example of work is holding a heavy bag.
a)
True
b)
false
26.
Work is a measurement of how much force is applied over a certain
a)
distance
b)
velocity
c)
shape
d)
size
27.
You do work only when you exert a force on an object and move it.
a)
True
b)
False
28.
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
29.

If the object does not move then what is happening

a)

nothing

b)

work

c)

power

d)

no work is being done on the object

30.

Two factors that determine work are...

a)

Force

b)

Mass

c)

Velocity

d)

Distance

31.

The ( ) the force the ( ) work is done

a)

less, more

b)

smaller, more

c)

bigger, more

d)

bigger, less

32.

Fred kicks a ball with a force of 20N to George, who is 5M away.


How much work was done to the ball?

a)

25 J

b)

100 J

c)

4 J

d)

75 J

33.

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

34.
Work divided by time equals...
a)
energy
b)
power
35.
The unit used to measure power is the 
a)
Watt
b)
Newton
c)
Joule
d)
Newton*meter
36.
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
37.

Person A and Person B are both using the same amount of work to lift something. Person A takes half as much time to do it. Who has greater power.

a)

Person A

b)

Person B

38.
You do 90 joules of work in 30 seconds. How much power have you generated?
a)
30 watts
b)
3 watts
c)
120 watts
d)
270 watts
39.

A force of 4.6 N moves a 2.7 kg box a distance of 3.3 m in 6.8 s. How much power is exerted?

a)

2.23 W

b)

6.03 W

c)

17.4 W

d)

278.7 W

40.
Which of the following would produce the most power?
a)
A mass of 10 kilograms lifted 10 meters in 10 seconds 
b)
A mass of 10 kilograms lifted 10 meters in 5 seconds
c)
A mass of 5 kilograms lifted 10 meters in 5 seconds
d)
A mass of 5 kilograms lifted 5 meters in 10 seconds
41.
You move an 8-newton weight five meters in 4 seconds. How much power have you generated?
a)
160 watts
b)
10 watts
c)
6.4 watts
d)
17 watts
42.

We can calculate the work done by using the formula

a)

Force × Energy

b)

Force × Distance

43.

Energy is the ability to do work.

a)

True

b)

False

44.

what is the formula needed to solve for work?

a)

W=F Δ\Delta x

b)

W=F/undefined x

c)

F=Wundefined x

45.

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

46.

If 40N of force is applied to Rollo Koster's 10 kg cart over a distance of 50 meters, how much work is done?

a)

8000J

b)

8000N

c)

4000J

d)

2000J

47.
In which of these cases is work being done? 
a)
A student sleeps
b)
A student pushes a locked door that does not move
c)
a student carries his chair into another room
d)
A student sits on the carpet
48.

Ahmed is out with his friends. Misfortune occurs and Ahmed and his friends find themselves getting a workout. They apply a cumulative force of 1000 N to push the car 200 m out of the sand. Determine the work done on the car.

a)

2 x 105 J

b)

2.70 x 104 J

c)

3.2 x 10-4 J

d)

3.54 x 105 J

49.

Two people push on a wall with 100 N. The wall doesn’t move. How much work is done?

a)

100J

b)

100N

c)

0J

d)

0N

50.

A student lifts 100 N of books 1 m to his shoulder. He walks forward 10 m to the stairs and goes up 3 m. He walks 20 m forwards to class. How much work has been done to the books?

a)

No work is done

b)

100J

c)

300J

d)

400J

51.

An airplane passenger carries a 215-N suitcase up the stairs , a displacement of 4.20 m vertically and 4.60 m horizontally. How much work does the passenger do on the suitcase.

a)

903 J

b)

989 J

c)

976 J

d)

945 J

52.

A mover loads a 185-kg refrigerator into a moving van by pushing it at a constant speed up a 10.0 m , friction free ramp at an angle of inclination of 11 degrees. How much work is done by the mover on the refrigerator?

a)

1.86 x 103 J

b)

3.45 x 102 J

c)

3.46 x 103 J

d)

1.78 x 104 J

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.
This is work divided by time.
a)
Work
b)
Distance
c)
Power
55.
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
56.

What is mechanical advantage?

a)

The advantage a machine has over a bicycle

b)

A measure of how much a simple machine reduces work

c)

A measure of when is the best time to use a simple machine

d)

A measure of the input force is multiplied using a simple machine

57.

What is an advantage of using a simple machine?

a)

less work in more time

b)

less work in less time

c)

more work less time

d)

same work less time

58.
To increase the mechanical advantage of a lever
a)
make sure the fulcrum is in the middle of the lever
b)
move the fulcrum closer to the load
c)
move the fulcrum closer to the effort
d)
use a bigger fulcrum
59.
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
60.

Which action is considered to having no work done?

a)

A forklift lifting boxes

b)

Pushing a wheelchair up a ramp

c)

A snowplow moving snow

d)

A hockey puck being hit on ice

61.
Force is measured in...
a)
Kilograms
b)
m/s
c)
Newtons
d)
Joules 
62.
The amount of energy used when a force moves an object a certain distance
a)
Work
b)
Force
c)
Newtons 
d)
Joules
63.
Ramps make work easier by _________ distance
a)
Increasing
b)
Decreasing
64.
Which person is doing more work?
a)
Left 
b)
Right 
c)
Both
d)
Neither; they are doing the same amount of work.
65.
The main force opposing things that roll or slide
a)
Gravity
b)
The Buoyant Force
c)
Friction
d)
A wall
66.

Two factors that determine work are...

a)

Force

b)

Mass

c)

Velocity

d)

Distance

67.

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

68.

Fred kicks a ball with a force of 20N to George, who is 5M away.


How much work was done to the ball?

a)

25 J

b)

100 J

c)

4 J

d)

75 J

69.

If 40N of force is applied to Rollo Koster's 10 kg cart over a distance of 50 meters, how much work is done?

a)

8000 J

b)

8000 N

c)

4000 J

d)

2000 J

70.

If the mystery machine moves 100 meters how much work is done?

a)

130,000,000 J

b)

70,000 J

c)

100,000 J

d)

30,000 J

71.

If Jay Loppy pushes his van 20 meters how much work is done?

a)

2,000 J

b)

40,000 J

c)

10,000 J

d)

800,000 J

72.

What does the prefix 'kilo' mean?

[E.g. the 'k' in km]

a)

10

b)

100

c)

1000

d)

1,000,000 (million)

e)

1,000,000,000 (billion)

73.

What does the prefix 'Mega' mean?

[E.g. the 'M' in MJ]

a)

10

b)

100

c)

1000

d)

1,000,000 (million)

e)

1,000,000,000 (billion)

74.

What does the prefix 'Giga' mean?

[E.g. the 'G' in GJ]

a)

10

b)

100

c)

1000

d)

1,000,000 (million)

e)

1,000,000,000 (billion)

75.

What does the prefix 'centi' mean?

[E.g. the 'c' in cm]

a)

1/10

b)

1/100

c)

1/1000

76.

What does the prefix 'milli' mean?

[E.g. the first 'm' in mm]

a)

1/10

b)

1/100

c)

1/1000

77.

What does the prefix 'deci' mean?

[E.g. the 'd' in dm]

a)

1/10

b)

1/100

c)

1/1000

78.

1m = _______cm

[1m contains how many cm?]

a)

10

b)

100

c)

1000

d)

1,000,000

79.

1km = _______m

a)

10

b)

100

c)

1000

d)

1,000,000

80.

1min = _______seconds

a)

10

b)

60

c)

100

d)

3600

81.

1hour = _______seconds

a)

10

b)

60

c)

100

d)

3600

82.
200 mm = ____ cm
(1 cm = 10 mm)
a)
20 mm
b)
20 km
c)
20 cm
d)
20 dm
83.
40 cm = ______ mm
( 1 cm = 10 mm)
a)
4000
b)
40
c)
400
d)
None of the Above
84.
900 cm ____ 9000 mm
(1 cm is 10 mm)
a)
<
b)
=
c)
>
85.
18,000 g ____ 10 kg
(1 kg is 1000 g)
a)
<
b)
=
c)
>
86.
Convert 17 m to cm:
(1 m = 100 cm)
a)
0.17 cm
b)
0.017 cm
c)
1,700 cm
d)
170 cm
87.
1000 grams = _____ kilograms
a)
0.0001
b)
1,000,000
c)
10
d)
1
88.
1 L = _______ mL
a)
1
b)
10
c)
100
d)
1000
89.
7,000 g = ____ kg
(1 kg = 1000 g
a)
70
b)
7000
c)
7
d)
0.07
90.

Which one of Newton's laws is shown

a)

3rd law

b)

2nd law

c)

1st law

91.

Which one of Newton's laws are displayed

a)

2nd law

b)

1st law

c)

3rd law

92.

Which of Newton's laws is shown

a)

1st law

b)

3rd law

c)

2nd law

93.

An object in motion will stay in motion and an object at rest will stay at rest unless acted upon by an outside force. Which law does this describe

a)

2nd law

b)

1st law

c)

3rd law

94.

What force slows objects down and keeps them from moving?

a)

Acceleration

b)

Gravity

c)

Friction

d)

Net Force

95.
What is the force that causes objects to fall to Earth?
a)
Air resistance
b)
Gravity
c)
Water resistance
d)
Pressure
96.
What is the name of the units that we measure force in?
a)
Einsteins 
b)
Newtons
c)
Kg
d)
Metres
97.
What will cause an object to move?
a)
Applied forces
b)
Balanced forces
c)
Unbalanced forces
98.
If an object is stationary (not moving) the forces acting upon it are _____________
a)
unbalanced
b)
weak
c)
balanced
d)
Hulk Smash!
99.
What is the net force?
a)
20 N 
b)
0 N 
c)
400 N 
d)
40 N 
100.
What is the net force?
a)
10 N
b)
0 N
c)
25 N
d)
1 N
101.
The sum of all forces acting on an object.
a)
Contact Force
b)
Balanced Force
c)
Unbalanced Force
d)
Net Force
102.
You and your dad are moving the couch from one side to another. Your dad pushes with a force of 35 N to the right and you push with a force of 25 N right. What is the net force on the couch?
a)
60 N right
b)
10 N left
c)
60 n right
d)
50 N left
103.

Suppose that an astronaut throws a baseball in outer space at a location far from significant influences of gravity and air resistance. One would expect that the baseball would ____.

a)

eventually stop since all objects ultimately "lose their steam"

b)

eventually stop as its inertia slowly becomes used up

c)

continue in motion with the same speed and direction

d)

either a, b, or c -- depending on whether the astronaut continues to push it

104.

All objects have inertia

a)

True

b)

False

105.

Inertia depends on ______

a)

Velocity

b)

Speed

c)

Distance

d)

Mass

106.

A skateboard rolls down a hill, reaches the level surface and eventually comes to a stop. The fact that the skateboard ultimately stops is best explained by ____.

a)

an unbalanced force would be required to keep the sled moving forward at constant speed

b)

the presence of an unbalanced force (e.g., friction) can cause a moving object to stop

c)

the presence of inertia causes it to stop

d)

the natural tendency of any object is to ultimately stop

107.

the tendency of an object to resist a change in its motion

a)

acceleration

b)

inertia

c)

mass

d)

frame of reference

108.
Objects with greater _________ also have greater inertia.
a)
speed
b)
mass
c)
temperature
d)
friction
109.

Velocity is speed with __________________________.

a)

a unicycle helmet

b)

direction

c)

fight

110.
Which of the following is a unit for acceleration?
a)
km/s
b)
m/s2
c)
mi/hr
d)
ft
111.
When a car goes around a corner at 20 mph, why do we say it  accelerates?
a)
The car is accelerating because of the velocity is constant
b)
The car accelerates because it's going 20 mph
c)
Cars always accelerate when they are in motion
d)
The car is accelerating because it's changing direction
112.
Acceleration only takes place when things speed up. 
a)
True
b)
False
113.
When you stretch a rubber band, you are storing __________ energy. 
a)
kinetic 
b)
potential
c)
none of the above
d)
all of the above 
114.
Energy in motion is called:
a)
Potential Energy
b)
Kinetic Energy
115.
At which point is potential energy greatest?
a)
W
b)
X
c)
Y
d)
Z
116.
When a pendulum swings, at which point is potential energy at its greatest?
a)
1
b)
2
c)
3
d)
4
117.

Which of the following is the correct equation for calculating an object's gravitational potential energy?

a)

PE = mgh

b)

PE = mg / h

c)

PE = mg + h

d)

PE = gh

118.

Rank in order, from largest to smallest, the gravitational potential energies of the balls.

a)

1 > 2 = 4 > 3

b)

1 > 2 > 3 > 4

c)

3 > 2 = 4 > 1

d)

3 > 2 > 4 > 1

119.

A cheetah can run briefly with a speed of 31.0 m/s. Suppose a cheetah with a mass of 47.0 kg runs at this speed. What is the cheetah’s kinetic energy?

a)

1457 Joules

b)

22,584 Joules

c)

15 Joules

d)

45,167Joules

120.

How much gravitational potential energy does a 100kg (220lb.) skydiver have if they jump from 4000 meters?

a)

3920000 J

b)

294 J

c)

180000 J

d)

1225 J

121.

A 6kg cat misjudges a jump and falls 5 meters. How much gravitational potential energy does the cat have? (The cat is fine by the way.)

a)

294 J

b)

180000 J

c)

1225 J

d)

3920000 J

122.

What is the kinetic energy of a 1,600kg Mustang travelling at 15 m/s (33mph)

a)

180000 J

b)

294 J

c)

1225 J

d)

3920000 J

123.

A 50kg (100lb) person is running at 7m/s (about 16 mph). How much kinetic energy do they have?

a)

1225 J

b)

180000 J

c)

294 J

d)

3920000 J

124.

What is the unit for mass?

a)

kilogram (kg)

b)

meter (m)

c)

Newton (N)

d)

Joule (J)

125.

A 2kg television falls from 1 meter. How much energy does it have?

a)

19.6 J

b)

196 J

c)

2 J

d)

9.8J

126.
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
127.
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
128.
P=25 watts 
W=5000 Joules 
t=???
a)
200 sec
b)
0.0005 s
c)
125000 s
d)
125 s
129.
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
130.
Power is defined as the quantity that measures the rate at which _____ is done or energy is transformed.
a)
energy
b)
time
c)
work
d)
elasticity
131.

Two workers use 100 N of force to move a sofa 2 meters in 2 seconds. How much power is required?

a)

100 watts

b)

400 watts

c)

104 watts

d)

50 watts

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