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Forces

Total questions: 99

Worksheet time: 1hrs 12mins

Name
Class
Date
1.

A tractor pulls a trailer at a constant speed. The tractor exerts a forward force of 1600 N on the trailer. What is the force exerted by the trailer on the tractor?

a)

0 N

b)

1600 N backwards

c)

1600 N forwards

d)

3200 N forwards

2.

A force is applied to a body. Which property of the body cannot be changed by the force?

a)

its mass

b)

its shape

c)

its size

d)

its velocity

3.

An object falls from rest through the air and the air resistance on it increases. The object reaches terminal velocity. Which quantity decreases until its terminal velocity is reached?

a)

acceleration

b)

kinetic energy

c)

speed

d)

weight

4.

Each diagram shows two forces that are equal in magnitude. Which diagram shows two forces that are a Newton’s third law pair of forces?

a)

A

b)

B

c)

C

d)

D

5.

Two forces of 3.0 N and 4.0 N act at right-angles to each other. Which diagram shows the resultant R of these forces?

a)

A

b)

B

c)

C

d)

D

6.

The minimum distance in which a car can stop once the brakes are applied, is known as

a)

thinking distance

b)

stopping distance

c)

braking distance

d)

reaction time

7.

The minimum braking distance for a car is tested on a dry road. The test is then repeated on a wet road. What happens to the braking distance and to the frictional force between the tyres and the road?

a)

A

b)

B

c)

C

d)

D

8.

A force of 20 N pushes an object of mass 5.0 kg along a rough horizontal surface where the frictional force is 5.0N. What is the acceleration of the object?

a)

1.0 m/s2

b)

2.0 m/s2

c)

3.0 m/s2

d)

4.0 m/s2

9.

How is the motion of a body affected by balanced and unbalanced forces acting on it?

a)

A

b)

B

c)

C

d)

D

10.

A wooden block is pushed across a table at constant speed.

Which statement is correct?

a)

The frictional force increases as the block moves at constant speed.

b)

The frictional force is equal and opposite to the pushing force.

c)

The frictional force is greater than the pushing force.

d)

The frictional force is less than the pushing force.

11.

The sum of all forces acting on an object and direction is called the

a)

Balanced Force

b)

Net Force

c)

Unbalanced Force

d)

Contact Force

12.

A push/pull exerted on an object is called

a)

Force

b)

Momentum

c)

Speed

d)

Net force

13.

Are the forces balanced or unbalanced?

a)

Balanced

b)

Unbalanced

14.

Forces have both ________ and direction.

a)

Magnitude

b)

Speed

c)

Gravity

d)

Height

15.

A Newton is a unit of ______.

a)

Acceleration

b)

Inertia

c)

Force

d)

Velocity

16.

Name the missing force.

a)

Gravitational Force

b)

Normal Force

c)

Friction Force

d)

Applied Force

17.

Name the missing force.

a)

Normal Force

b)

Push/Pull Force

c)

Friction Force

d)

Tension Force

18.

Name the missing force.

a)

Normal Force

b)

Friction Force

c)

Gravitational Force

d)

Push/Pull Force

19.

Name the missing force.

a)

Gravitational Force

b)

Normal Force

c)

Tension Force

d)

Friction Force

20.

The force that keeps objects on top of surfaces instead of letting them sink into the surface is known as:

a)

Normal Force

b)

Gravitational Force

c)

Friction Force

d)

Air resistance

21.

This diagram can be used to indicate which of the following? (TWO correct answers)

a)

An object at rest

b)

An object accelerating

c)

An object decelerating

d)

an object moving at a constant velocity (speed)

e)

(Trick question -- there is only one correct answer)

22.

Which of the following is true about this free-body diagram?

a)

the forces are balanced

b)

the object is moving upward

c)

the object is free-falling

d)

the forces are unbalanced

23.

Newton's First Law: An object in motion will stay in motion and an object at rest will stay at (a)   unless acted on by an outside force.

24.

A leftward force is applied to a crate to push it across the floor at a constant speed. Which is the correct force diagram?

a)
b)
c)
d)
25.

A rightward force is applied to a dresser to accelerate it to the right across the bedroom floor.

a)
b)
c)
d)
26.
What is the net force?
a)
40 N left
b)
0 N Balalnced
c)
400 N right
d)
40 N right
27.

How will this object move?

a)

It won't move.

b)

It will accelerate to the right.

c)

It will accelerate to the left.

d)

It will accelerate in both directions.

28.
What is the net force?
a)
30 N left
b)
25 N right
c)
5 N left
d)
55 N right
29.

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)

10 N right

d)

50 N left

30.

What is the net force?

a)

400 N Up

b)

400 N Down

c)

0

d)

800 N Down

31.
The sum of all forces acting on an object and direction
a)
Contact Force
b)
Balanced Force
c)
Unbalanced Force
d)
Net Force
32.
Are forces balanced or unbalanced when a car is moving at a constant speed in a straight line?
a)
Balanced
b)
Unbalanced
33.

What is the unit of force?

a)

Kilogram

b)

Meter

c)

m/s2

d)

Newton

34.
If an object is stationary (not moving) the forces acting upon it are _____________
a)
unbalanced
b)
weak
c)
balanced
d)
Hulk Smash!
35.
A ____________ is a push or a pull on an object.
a)
chemical
b)
force
c)
magnet
d)
gravity
36.

An unbalanced force causes:

a)

movement

b)

acceleration

c)

motion

d)

change in time

37.

A 12 kg ball is accelerated at a rate of 2.0 m/s2. Calculate the force.

F = m x a

a)

.16 N

b)

6 N

c)

24 N

d)

24kg

38.
Balanced or unbalanced?
a)
balanced
b)
unbalanced
39.

Calculate the Net Force.

a)

60N, Left

b)

40N, Right

c)

0N

d)

60N, Right

40.
A wheeled cart is moving to the right at a constant speed.  Two forces of equal magnitude are acting upon the cart. Which of the following best describes the forces and motion of the cart?
a)
Balanced Forces, Constant Speed
b)
Balanced Forces, Acceleration
c)
Unbalanced Forces, Constant Speed
d)
Unbalanced Forces, Acceleration
41.
What is a force?
a)
the PUSH or PULL on an object 
b)
The MOTION an object creates
c)
The objects HITTING one another
d)
Going REALLY FAST
42.
With unbalanced forces, the object will move in the direction of the _______ force.
a)
larger 
b)
smaller 
c)
equal 
43.
If there are two forces going in the SAME direction, you would ...?
a)
(-) Subtract the forces
b)
(+) Add the forces
c)
Neither
d)
(x) Multiply
44.

If there are two forces going in opposite directions how would you find the net force?

a)

Subtract

b)

Add

c)

Neither

d)

Multiply

45.
What is the net force?
a)
5.5 N left
b)
5.5 N right
c)
2.5 N left
d)
2.5 N right
46.
What is the net force?
a)
65 N left
b)
65 N right
c)
35 N left
d)
35 N right
47.
If these boys are pulling with the same amount of force.  What will happen?
a)
The boy in blue will win.
b)
They will not move at all.
c)
The boy in red will win.
d)
Both will fall down.
48.
What is the net force?
a)
4.2 N left
b)
4.2 N right
c)
2.2 N left
d)
2.2 N right
49.
What is the net force?
a)
11 N left
b)
11 N right
c)
3 N left
d)
3 N right
50.
What is the net force?
a)
3 N left
b)
3 N right
c)
7 N left
d)
7 N right
51.
The diagram below shows a skateboarder pushing himself forward with a force of 25 N while the wind pushes back with a force of 5 N. How will the skateboarder be affected if the force of the wind increases to 8 N?
a)
The speed of the skateboarder will increase.
b)
The speed of the skateboarder will remain constant.
c)
The speed of the skateboarder will decrease.
d)
The skateboarder will come to a stop.
52.
Forces that have a net force of zero ( the object is still).
a)
Balanced force
b)
Unbalanced force
53.
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
54.
Which one is balanced?
a)
top
b)
bottom
c)
both
55.
What is the net force?
a)
17 N Right
b)
3 N Right
c)
3 N Left
d)
17 N Left
56.
Calculate the net force shown in the  diagram?
a)
0N
b)
400 N
c)
600 N
d)
800 N
57.

If both people are exerting a force of 30 N, what is the net force?

a)

30 N

b)

60 N

c)

300 N

d)

0 N

58.

If the boy is pulling with a force of 10 N and the girl is pushing with a force 20 N, what is the net force on the box?

a)

10 N

b)

20 N

c)

30 N

d)

0 N

59.

Quelles sont les informations nécessaires pour connaître une force ?

a)

valeur

b)

direction

c)

point d'application

d)

sens

e)

longueur

60.

Lorsqu'une pomme tombe d'un pommier, l'action est exercée par :

a)

le pommier

b)

la Terre

c)

le sol

d)

l'air

61.

Sur cette image, les deux forces ont :

a)

même sens

b)

même direction

c)

même valeur

d)

même point d'application

62.

Choisis la bonne relation pour calculer le poids d'un objet

a)

P=m×gP=m\times g

b)

P = mgP\ =\ \frac{m}{g}

c)

P = gmP\ =\ \frac{g}{m}

63.

La masse d'un corps dépend du lieu où il se trouve.

a)

Vrai

b)

Faux

64.

La direction du poids est...

a)

Verticale

b)

Vers le haut

c)

Vers le bas

65.
L'attraction gravitationnelle à  la surface de la Terre s'appelle ... ?
a)
Le poids
b)
La masse
c)
La force
d)
L'inertie
66.

Quelle est la direction et le sens du poids P ?

a)

Verticale vers le bas

b)

Verticale vers le haut

c)

Horizontale vers la gauche

d)

Horizontale vers la droite

67.

Quelle est l'unité de la force ?

a)

Newton (N)

b)

Kilogramme (kg)

c)

Mètre par seconde (m/s)

68.
L'attraction gravitationnelle se calcule avec la formule :
a)

FA∠B =G x mA x mB d2F_{A\angle B\ }=\frac{G\ x\ m_{A\ }x\ m_{B\ }}{d^2}  

b)

P=m x gP=m\ x\ g

c)

FA∠B =dx mA x mB G2F_{A\angle B\ }=\frac{d^{ }x\ m_{A\ }x\ m_{B\ }}{G^2}  

d)

FA∠B =G x d x mB mA2F_{A\angle B\ }=\frac{G\ x\ d\ x\ m_{B\ }}{m_A^2}

69.

La force de gravitation exercée par la terre sur un objet peut aussi être appelée :

a)

Le champ magnétique

b)

La force de pesanteur

c)

Le poids

d)

L'attraction terrestre

70.

La valeur ( ou intensité ) d'une force se mesure avec :

a)

Un manomètre

b)

Un multimètre

c)

Un dynamomètre

d)

Un tachymètre

71.

La force représentée par une flèche bleue est exercée...

a)

par le chien sur la laisse.

b)

par la laisse sur la maîtresse.

c)

par la maitresse sur la laisse.

d)

par la laisse sur le chien.

72.

Comment se nomme cet appareil de mesure?

a)

Un forcemètre.

b)

Une balance

c)

Un dynamomètre

d)

Un podomètre.

73.

Un corps ayant une masse 70g. calculer son poids sur la terre. g=10N/Kg

a)

700N

b)

0,7 N

c)

7 N

d)

70N

74.

Is this an example of balanced or unbalanced forces

a)

Balanced

b)

Unbalanced

75.

Is this an example of balanced or unbalanced forces?

a)

Balanced

b)

Unbalanced

76.

Calculate the net force exerted on the box. DO NOT put direction. Units are required

(a)  

77.

What direction will the box go?

a)

Left

b)

Right

78.

Are the forces on the plan balanced or unbalanced

a)

Balanced

b)

Unbalanced

79.

Which direction will the airplane move? Select all that apply

a)

Left

b)

Down

c)

Up

d)

Right

80.

What is the force at C. Pay attention to the net force

(a)  

81.

What is the force at D. Pay attention to the net force

(a)  

82.

A car has a mass of 10 kg. It decelerates at a rate of 3.4 m/s2. What force was applied to the car?

a)

2.94 m/s2

b)

34 m/s

c)

29.4 kg

d)

34 N

83.

What is the WEIGHT (in Newtons) of a 12.75 kg toddler on Earth?

a)

124.95 kg

b)

124.95 N

c)

124.95 lbs

84.

What is the MASS of a large cow on Earth that has a weight of 4578 Newtons?

a)

423.34 kg

b)

521.34 kg

c)

467.14 kg

d)

384.89 kg

85.

An astronaut is standing on the surface of the planet Mars. She has a mass of 60 kg and has a weight of 225 Newtons while on Mars. What is the ACCELERATION DUE TO GRAVITY on Mars?

a)

4.25 m/s2

b)

3.70 m/s2

c)

3.44 m/s2

d)

3.75 m/s2

86.

Mass is defined as...

a)

a measure of the amount of matter ("stuff") in an object

b)

a measure of gravitational force exerted on an object

c)

a measure of the amount of space an object occupies

d)

a measure of the rate of change in the velocity over time

87.

Weight is defined as...

a)

a measure of the amount of matter ("stuff") in an object

b)

a measure of gravitational force exerted on an object

c)

a measure of the amount of space an object occupies

d)

a measure of the rate of change in the velocity over time

88.

Which of the following is NOT related to an object's mass?

a)

How much space the object takes up

b)

How many atoms an object is made of

c)

How much matter is inside of an object

d)

How much inertia an object has

89.

The correct equation for momentum is....

a)

p=m/v

b)

p=m2v

c)

p= m/2v

d)

p = mv

90.

Which of the following statements best describes the Law of Conservation of Momentum?

a)

An object in motion stays in motion.

b)

Every force has an equal and opposite force.

c)

The total momentum of a system before a collision is equal to the total momentum of the system after the collision.

d)

A force applied onto an object will accelerate.

91.

Which of the following situations is the best example of the Law of Conservation of Momentum?

a)

A ball flying through the air

b)

A woman standing on an elevator that is not moving

c)

A car moving south on I-94 at 67 mph

d)

One hockey player colliding with another.

92.

A ball has a velocity of 5 m/s and a mass of 10 kg. What is the momentum of the ball?

a)

2 kg m/s

b)

0.5 kg m/s

c)

50 kg m/s

d)

0 kg m/s

93.

A 2 stage rocket is blasting off into space. Once the solid fuel containers are empty the containers will detach from the rocket. If the rocket had a momentum of 25,000 kg m/s before the solid fuel containers detached and a momentum of 20,000 kg m/s after the solid fuel containers detached. How much momentum do the solid fuel containers have after detaching from the rocket?

a)

45,000 kg m/s

b)

5,000 kg m/s

c)

25,000 kg m/s

94.

Two billiard (pool) balls hit each other. Before the collision the first ball has a momentum of 4.5 kg m/s and the second ball is at rest. If the first ball has a momentum of 1.5 kg m/s after the collision what is the momentum of the second ball after the collision?

a)

6 kg m/s

b)

1.5 kg m/s

c)

3 kg m/s

95.

What is the value of "g" (acceleration due to gravity) here on earth?

a)

4.56 m/s2

b)

8.91 m/s2

c)

10 m/s2

d)

9.8 m/s2

96.

If we dropped a 45 N ball and a 90 N ball off of the school at the same time from the same height which one would hit the ground first? (Ignore Air Resistance)

a)

45 N ball

b)

90 N ball

c)

Both will hit at the same time

d)

Not enough information to answer the question

97.

Terminal velocity occurs when:

a)

the air resistance on an object increases.

b)

an object starts to slow down due to air resistance.

c)

the acceleration due to gravity equals zero.

d)

the force of gravity is balanced by the air resistance on an object.

98.

A metal ball bearing breaks free from an airplane and free falls for 6.82 seconds. If it never reaches terminal velocity, what is its approximate final velocity after 6.82 seconds?

a)

66.84 m/s

b)

62.8 m/s

c)

68.2 m/s

d)

Not enough information

99.

The two spheres in the illustration below were dropped at the exact same time and are falling through the Earth's atmosphere. Sphere A, because of its size, reaches terminal velocity, while Sphere B doesn't reach terminal velocity. Which sphere will hit the ground first?

a)

Sphere A

b)

Sphere B

c)

Neither

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