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Forces and Simple Machines

Total questions: 65

Worksheet time: 4hrs 58mins

Name
Class
Date
1.
Which of Newton's laws states that "For every action, there is an equal and opposite reaction?"
a)
Newton's First Law of Motion
b)
Newton's Second Law of Motion
c)
Newton's Third Law of Motion
2.
Which law states, "An object in motion stays in motion, and an object at rest stays at rest, unless acted upon by an unbalanced force?"
a)
Newton's First Law of Motion
b)
Newton's Second Law of Motion
c)
Newton's Third Law of Motion
3.
The bigger an object is, the more mass it has. An object of greater mass will accelerate faster and therefore have a greater force. Which law is this referring to?
a)
Newton's First Law of Motion
b)
Newton's Second Law of Motion
c)
Newton's Third Law of Motion
4.
Which of the following is an example of work begin done?
a)
holding a heavy box
b)
pushing on a locked door (and the door not moving)
c)
lifting a baby
d)
standing still
5.
The bike you are riding hits a hole and stops quickly, but you fly forward over the handlebars, staying in motion, even though the bike stops. Which law would this be representing?
a)
Newton's First Law of Motion
b)
Newton's Second Law of Motion
c)
Newton's Third Law of Motion
6.
A _____________ is a push or pull and can make an object stop, speed up, slow down or change direction. 
a)
gravitation
b)
work
c)
force
d)
inertia
7.
A force that occurs when  two objects rub against and oppose each other. 
a)
conduction
b)
friction 
c)
gravity
d)
radiation
8.
A force that pulls all objects back down toward the Earth. 
a)
friction
b)
movement
c)
gravity
d)
work
9.
The picture above shows a car that has equal forces acting on it in all directions. The car stays still. This is an example of 
a)
gravity 
b)
a balanced force
c)
an unbalanced force
d)
work
10.
Look at the image. Are the forces balanced or unbalanced?
a)
balanced
b)
unbalanced
11.
What happens when an object is acted on by balanced forces? 
a)
the velocity (speed) will change
b)
the object will speed up (accelerate)
c)
the objects direction of motion will change
d)
the objects motion will not change
12.
When using an inclined plane, the ______________ the board, the ___________________ the force. 
a)
shorter, less
b)
longer, more
c)
longer, less
13.
Which measurement tool is pictured?
a)
balance scale
b)
spring scale
c)
graduated cylinder
d)
thermometer
14.
Which type of surface requires more frictional force to pull across?
a)
sand paper
b)
glove
c)
rubber strip
d)
turf rubber
15.
 The law of conservation of energy states that when one form of energy is converted into another,
a)
Energy is destroyed in the process
b)
Energy is created in the process
c)
No energy is destroyed in the process
d)
Energy is lost in the process
16.
The energy associated with motion is called
a)
Kinetic energy
b)
Elastic potential energy
c)
Gravitational potential energy
d)
Nuclear energy
17.
How do you calculate power?
a)
P = W/t
b)
P = E/t
c)
P = w * t
d)
P = bbq/chicken
18.
How do we calculate work?
a)
W = F * d
b)
w = f * D
c)
W = F * D
d)
w = f * d
19.
How much work is being done with 200 N of force over 426 meters?
a)
85,200 J
b)
45,620 J
c)
90,480 J
d)
62,329 J
20.
The SI unit of work is?
a)
Joules
b)
Watts
c)
Newtons
d)
meters
21.
Energy that is stored is called...
a)
Kinetic
b)
Potential 
22.
The SI unit for power is...?
a)
Watts
b)
Joules
c)
Newtons
d)
Meters
23.
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
24.
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 
25.

Calculate the potential energy of a car with a mass of 2,500 kg that is on a hill 100 meters above sea level.

a)

250,000 J

b)

2,450,000 J

c)

2,451,663 J

d)

248 J

26.

Lilly's cat ran through your yard. The cat has a mass of 5 kg. He is running at a speed of 3 m/s. What is the kinetic energy of the cat as he runs?

a)

8.5 J

b)

45 J

c)

7.5 J

d)

22.5 J

27.

A 5 Kg body is having a Kinetic energy of 250 J. What is the velocity of the body?

a)

10 m/s

b)

15 m/s

c)

20 m/s

d)

40 m/s

28.

A exercise ball is on a table 2.5 m above the ground. What is the mass of the ball if it has a GPE of 56.8 J?

a)

71 kg

b)

22.72 kg

c)

142 kg

d)

2.32 kg

29.

Ty lifts a set of 1250kg weights a vertical distance of 2m in a weight lifting contest. What Potential Energy do the weights now possess?

a)

12,789 Joules

b)

24,500 Joules

c)

4,500 Joules

30.
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
31.

At which point of this roller coaster is the energy 1/2 kinetic and 1/2 potential?

a)

A

b)

B

c)

C

d)

D

32.

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

33.

What kind of energy does a marble at the top of a hill have?

a)

gravitational potential

b)

chemical potential

c)

kinetic

d)

thermal

34.

What is the equation for gravitational potential energy

a)

mv

b)

1/2 mv^2

c)

mgh

d)

Ft

35.

In the free-body diagram, which of the following is the gravitational force acting on the balloon?

a)

5120 N

b)

950 N

c)

1520 N

d)

4050 N

36.
Two forces act on an object to the right at the same time.  What force is required to bring the object into equilibrium?
a)
9 N to the right
b)
9 N to the left
c)
3 N to the left
d)
18 N to the left
37.
Which statement is correct regarding the ball as it moves down the incline?
a)
It has a net force acting on it.
b)
All forces are balanced acting on it.
c)
The applied force is equal to friction.
d)
Its inertia is less than its mass.
38.
If an object is resting on a flat, horizontal surface, which of the following will be equal?
a)
weight, mass, gravitational force
b)
normal force, weight, gravitational     force
c)
mass, normal force, frictional force
d)
net force, gravitational force,   frictional force
39.

The diagram shows a box being pulled up the ramp. Which letter represents normal force?

a)

A

b)

B

c)

C

d)

D

40.

The diagram shows a box being pulled up the ramp. Which letter represents applied force?

a)

A

b)

B

c)

C

d)

D

41.

The diagram shows a box being pulled up the ramp. Which letter represents the weight?

a)

A

b)

B

c)

c

d)

d

42.

The diagram shows a box being pulled up the ramp. Which letter represents the frictional force?

a)

A

b)

B

c)

c

d)

d

43.
How will this object move? 
a)
It won't move. 
b)
It will move to the right. 
c)
It will move to the left. 
d)
It will move up. 
44.
Calculate the Net Force. 
a)
60N, Left 
b)
40N, Right 
c)
0N
d)
60N, Right
45.
What is the ideal mechanical advantage of a lever with a resistance arm of 3 m and an effort arm of 12 m?
a)
4
b)
0.25
c)
15
d)
0.5
46.
You use a lever to lift a filing cabinet to get a lost key. The input arm is 2 ft and the output arm is 1 ft. What is the MA of the lever?
a)
2
b)
0.5
c)
1
d)
0.25
47.
You apply a force on a crowbar to open a stuck door. The effort length of the crowbar is 26 cm long and the resistance length is 4 cm. Find the MA of the crowbar
a)
0.15
b)
7
c)
6.5
d)
0.5
48.
A worker uses a board that is 4 m long to pry up a boulder. A small rock is used for a fulcrum and is placed 0.5 m from the resistance end of a lever. Calculate the MA of the board.
a)
0.13
b)
0.14
c)
8
d)
7
49.
Three of your friends are all sitting on one end of a seesaw. The combined weight is 275 N. The length from the fulcrum to your friends is 2.5 m. The rest of the seesaw (from the fulcrum to you) is 4.5 m. What effort force is needed to lift your friends?
a)
0.006
b)
500
c)
152.8
d)
0.002
50.
To lift a refrigerator, you can apply a force of 50 N to the 3 ft end of a lever. The lever applies a force of 550 N to the fridge. How long must the resistance arm be to accomplish this task?
a)
0.3 ft
b)
3.7 ft
c)
0.5 ft
d)
4.5 ft
51.
Susan's truck gets stuck in the mud. She uses a tree branch as a lever to lift the truck out. She applies an effort force of 700 N to the branch and the back of the truck weighs 2100 N. What is the mechanical advantage of the tree branch?
a)
0.5
b)
3
c)
0.3
d)
4
52.
It takes 130 N to push a 52 kg object up an inclined plane. Calculate the mechanical advantage of the inclined plane.
a)
2.5
b)
0.4
c)
3.92
d)
0.26
53.
It has been proposed that the stones of the Pyramids in Egypt were raised by using ramps. Suppose one of these ramps had a mechanical advantage of 3.86. If an input force of 6350 N was provided by the laborers, what would the output force on the stone have been?
a)
1,645 N
b)
24,511 N
c)
5,482 N
d)
19,813 N
54.
1. A _________is a simple machine with a fulcrum and a rigid bar.
a)
Pivot
b)
Lever
c)
Wedge
55.
What is the anticlockwise moment acting on this crane?
a)
80,000Nm
b)
100,000Nm
c)
120,000Nm
d)
140,000Nm
56.
What is the moment acting on the seesaw?
a)
1.6Nm
b)
15Nm
c)
16N
d)
4Nm
57.
What is the moment produced by the 15 N?
a)
15 Nm (clockwise)
b)
150 Nm (anti - clockwise)
c)
1.5 Nm (anti - clockwise)
d)
0.15 Nm (clockwise)
58.
A seesaw is unbalanced with two people of different masses sitting equal distances from the center. Which of the following will result in equilibrium?
a)
The larger person moving further away from the center.
b)
Moving the smaller person closer to the center.
c)
Moving the smaller person further from the center.
d)
Making the larger person do nothing.
59.

Two masses of mass 10.0 and 6.0 kg are hung from massless strings at the end of a light rod. The rod is virtually weightless. A pivot (fulcrum) is placed off center and the system is free to rotate. If the 6.0 kg mass is 4.0 m away from the pivot, how far away is the 10.0 kg mass if the system is not rotating?

a)

0.42 m

b)

2.4 m

c)

4.8 m

d)

4.2 m

60.
A wrench is used to tighten a nut. A 15N perpendicular force is applied 50cm away from the axis of rotation, and moves a distance of 10 cm as it turns. What is the torque applied to the wrench?
a)
7.5 Nm
b)
1.5 Nm
c)
750 Nm
d)
150 Nm
61.

Assuming the system is in equilibrium, calculate the missing distance d

a)

3.4 m

b)

2.8 m

c)

4.4 m

d)

1.6 m

62.

The diagram shows a beam. Without any weights, the beam balances at its centre.

Three weights are hung as shown.

At which point does a load of 2 N balance the beam?

a)

A

b)

B

c)

C

d)

D

63.

A nut can be loosened more easily with

a)

a short spanner because a larger turning effect can be produced.

b)

a long spanner because a larger turning effect can be produced.

c)

a long spanner because a larger force can be produced.

d)

a short spanner because a larger force can be produced.

64.

The figure below shows a man lifting a heavy rock using a steel bar. He pushes downwards on the end of the bar with a force F.


Which pivot positions allows the force F to be as small as possible?

a)

A

b)

B

c)

C

d)

D

65.

A boy of weight 600N sits on the see-saw as shown at a distance of 1.5m from the pivot. What is the force F required at the other end to balance the see-saw?

a)

450 N

b)

350 N

c)

4.5 N

d)

200 N

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