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Forces Unit Review

Total questions: 72

Worksheet time: 3hrs 48mins

Name
Class
Date
1.

James exerts a force on 5N on Julian's hand. What is the force that Julian's hand exerts on James'?

a)

Greater than 5N

b)

Less than 5N

c)

Equal to 5 N

d)

Julian's hand does not exert a force on James

2.

The free body diagram of four boxes are shown below. Which box is in equilibrium?

a)
b)
c)
d)
3.
The combination of all forces acting on an object is called __________
a)
Parallelogram Rule
b)
Net Force
c)
Vector Quantity
d)
All the Jedi's using their abilities together
4.
What is Newton's First Law
a)
F=ma
b)
Every action has an equal and opposite reaction
c)
An object at rest stays at rest, an object in motion stays in motion. 
d)
Friction 
5.
What makes a rolling ball stop moving?
a)
Gravity
b)
Friction
c)
A balanced force
d)
An applied force
6.
Name the missing force....
a)
Weight force
b)
Normal force
c)
Frictional force
d)
Tension force
7.
Name the missing force...
a)
tension force
b)
gravitational force
c)
normal force
d)
applied force
8.

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

a)

normal

b)

abnormal

c)

static

d)

inertia

9.

TRUE or FALSE


Normal force is always perpendicular to the surface at which an object is resting.

a)

True

b)

False

10.

TRUE or FALSE


Friction force always goes in the same direction as the motion of an object.

a)

True

b)

False

11.

The force that pulls objects toward the Earth

a)

Speed

b)

Gravity

c)

Normal

d)

Thrust

12.

The acceleration of an object is dependent upon the net force acting upon the object and the mass of the object is which of Newton's laws?

a)

1st

b)

2nd

c)

3rd

d)

4th

13.

For every action there is an equal and opposite reaction is which of Newton's laws?

a)

1st

b)

2nd

c)

3rd

d)

4th

14.

What is defined a push or pull?

a)

force

b)

net force

c)

an unbalanced force

d)

a balanced force

15.

What is the term for when two forces are acting in opposite directions on an object and are equal in size and the object stays still

a)

net force

b)

balanced force

c)

accelerated force

d)

unbalanced force

16.

Forces that cause a change in motion of an object are called

a)

balanced forces

b)

net forces

c)

motion forces

d)

unbalanced forces

17.

Calculate the net force

a)

25

b)

65

c)

20

d)

15

18.

What is the net force?

a)

400

b)

800

c)

200

d)

600

19.

If you are pushing a 1200 kg car with an acceleration of 0.5 m/s2 , what is the force you have applied to the car?

a)

600

b)

2400

c)

4.16

d)

60

20.

calculate the force applied to a 5 kg shopping cart if it accelerates at 3 m/s2

a)

15

b)

1.67

c)

0.6

d)

1.57

21.

If you INCREASE the force applied to a 50 kg crate, what happens to the ACCELERATION of the crate

a)

acceleration increases

b)

acceleration decreases

c)

force increases

d)

this cannot be determined

22.

If you have a 500 kg motorcycle and you INCREASE the acceleration for 20 m/s2 to 40 m/s2, describe how you had to change the force applied to the motorcycle

a)

had to increase the force

b)

had to decrease the force

c)

had to increase the acceleration

d)

had to decrease the acceleration

23.

Based on Newton's 2nd Law of Motion, which statement is true about the acceleration of wagon A and wagon B if both are being pulled with the same external force

a)

wagon A will have a greater acceleration than wagon B

b)

wagon B will have a greater acceleration than wagon A

c)

wagon A and B will have the same accelerations

d)

the wagons will both have and acceleration of zero

24.

Based on Newton's 2nd Law of Motion, which statement is true about the force of the wagon with the kids if the mass of kids is identical but wagon A is moving TWICE the speed because it has more people pushing than that of wagon B

a)

wagon A will have a greater force

b)

wagon B will have a greater force

c)

the force will be the same for both wagons

d)

the force will be zero for both wagons

25.

If you are standing still what forces are acting on you?

a)

normal

b)

weight

c)

friction

d)

drag

26.

choose the non contact forces

a)

gravity

b)

friction

c)

electricity

d)

magnetism

27.

Forces have both ________ and direction.

a)

Magnitude

b)

Speed

c)

Gravity

d)

Height

28.
With unbalanced forces, the object will move in the direction of the _______ force.
a)
larger 
b)
smaller 
c)
equal 
29.
What is the magnitude (size) and direction of the net force?
a)
15 N to the left
b)
15 N to the right
c)
1 N to the left
d)
1 N to the right
30.
Name the missing force...
a)
buoyant force
b)
normal force
c)
weight force
d)
frictional force
31.
Name the missing force...
a)
tension force
b)
frictional force
c)
normal force
d)
spring force
32.
Name the missing force...
a)
weight force
b)
normal force
c)
buoyant force
d)
applied force
33.
Name the missing force...
a)
applied force
b)
weight force
c)
tension force
d)
drag
34.
Calculate the net force acting upon the object.
a)
10 N east
b)
0 N
c)
14.1 N east
d)
20 N north
35.

If a skydiver has a force of air resistance of value 50 N and the skydiver's weight is 75 N, what is happening to the motion of the skydiver?

a)

Since the net force is down and the skydiver is moving down, they will get faster.

b)

Since there is a force up, the skydiver must be moving upward.

c)

Since there is a force up, the skydiver must be slowing down.

d)

The force up will cancel the force down and the skydiver will move with constant (terminal) velocity.

36.

The normal force is ​ (a)   to and ​ (b)   from the surface. It is created because of ​ (c)   between two surfaces.

Choose from the below words
perpendicular
away
contact
attraction
parallel
toward
37.

An object is falling through the air at terminal velocity. Which of the following are true statements?

1. The net force is zero.

2. The forces are all balanced.

3. The object is accelerating.

4. The acceleration value is zero.

a)

1 and 4

b)

1, 2 and 3

c)

1, 2 and 4

d)

3 only

38.

Based on the information in the diagram, what is the net force acting on this object?

a)

12 N downward

b)

4 N upward

c)

4 N downward

d)

8 N to the left

39.

What are the horizontal and vertical net forces, if the 50 N force is applied at a 50° angle?

a)

Fnet x= 45 N ; Fnet y= 0 N

b)

Fnet x= 45 N ; Fnet y= 50 N

c)

Fnet x= 27 N ; Fnet y= 38 N

d)

Fnet x= 33 N ; Fnet y= 32 N

40.

What is the y-component (vertical) of the force in the diagram?

a)

58N

b)

217N

c)

-217N

d)

65N

41.

Which segment(s) on the following velocity vs time graph represents unbalanced forces?

a)

A only

b)

B only

c)

A and C

d)

A and B

42.
As the angle of the incline increases, what happens to the normal force?
a)
The normal force increases
b)
The normal force decreases
c)
The normal force is not affected by the incline
d)
The normal force is only dependent on the force due to gravity
43.
A box is pushed left with 35 N and right with 40 N of force. The box has a mass of 5 kg. What is the acceleration?
a)
5 m/s2
b)
1 m/s2
c)
25 m/s2
d)
8 m/s2
44.

The amount of attraction between two objects which are not in contact with each other is known as the _________.

a)

Normal force

b)

Gravitational force

c)

Magnetic force

d)

Electrical force

45.

What is the proper setup of the gravitational force formula?

a)

Fg= Gm2/r

b)

F=ma

c)

Fg= Gr2/(m1+m2)

d)

Fg= G (m1m2)/r2

46.

What effect does increasing the distance between the two objects do to the gravitational force?

a)

The distance between two objects has no effect on the gravitational force

b)

It increases

c)

It stays the same

d)

It decreases

47.

When do gravitational forces exist between two objects?

a)

They only exist between microscopic objects.

b)

They are always present between any two objects.

c)

Gravitational forces only act on objects falling on Earth.

d)

They only exist for objects in space.

48.

Which of the following changes would increase the gravitational force between two objects?

a)

Increase G

b)

Increase the mass

c)

Increase r

d)

Decrease G

49.
What are 2 factors that determine the amount of friction between 2 objects?
a)
Force and roughness between surfaces
b)
hills and valleys and how smooth or rough the surface is
c)
Amount of force and amount of surface the comes in contact
d)
The force and the weight exerted on the surfaces
50.
Which of the following is an example of friction that is harmful?
a)
Pencil marking on paper
b)
Engine parts wearing out
c)
sand placed on ice in the winter
d)
Using an eraser to erase marks
51.

FN=100N, Ff=20N

a)

μ=5.0

b)

μ=0.2

c)

μ=1.2

d)

μ=0.1

52.
Rougher surfaces have ...
a)
greater friction
b)
less friction
c)
the same level of friction
53.
 What is the force of friction between a block of ice that weighs 950 N and the ground if μ = .12? 
a)
65 N
b)
226 N
c)
175 N
d)
114 N
54.
the force due to friction on a bike tire is 70 N. If the coefficient of friction of the road is 0.78, what is the mass of the bike?
a)
89.7
b)
8.97 N
c)
8.97 kg
d)
54.6 kg
55.
Name the missing force...
a)
applied force
b)
weight force
c)
lift
d)
normal force
56.

We calculate our weight with the equation:

a)

W=mGW=m\cdot G

b)

W=mgW=m\cdot g

c)

W=mgW=\frac{m}{g}

d)

W=mW=m

57.

The units for mass are

a)

kg

b)

Netwons

c)

m/s2

d)

m/s

58.

The units for force are

a)

Newtons

b)

kg

c)

m/s2

d)

m/s

59.

Friction can be kinetic (movement) or static (no movement), which creates a greater force?

a)

They are equally strong

b)

kinetic > static

c)

static > kinetic

d)

friction doesn't cause a force

60.
Two factors effecting the magnitude of the force of gravity between 2 objects are...
a)
mass and distance 
b)
mass and matter
c)
distance and weight 
d)
weight and mass
61.
Which of the following will not change in different gravitational fields?
a)
wieght
b)
force
c)
mass
d)
pounds
62.
How are mass and weight different?
a)
Mass is the amount of matter in an object;Weight is the amount of gravitational force acting on the object
b)
Mass is the amount of gravitational force acting on an object;Weight is the amount of matter in an object
c)
Mass is a thing;Weight is a place
d)
Mass is an animal;weight is a human
63.
The constant velocity of a falling object when the force of air resistance equals the force of gravity is called: 
a)
terminal velocity
b)
projectile motion
c)
sliding friction
64.
A 80 kg skydiver is free falling at a constant velocity of 19 m/s. What is the net (total) force acting on her?
a)
1,520 N
b)
0 N
c)
4.21 N
d)
Not enough information to answer
65.

A man standing on a scale in an elevator notices that the scale reads 40 newtons greater than his normal weight. Which type of movement of the elevator could cause this greater-than-normal reading?

a)

accelerating upward

b)

accelerating downward

c)

moving upward at a constant speed

d)

moving downward at a constant speed

66.
"If we apply a ___________ to an object, its __________________ will change and it will  ______________."
a)
force, accelerate, gravity
b)
accelerate, inertia, gravity
c)
force, velocity, accelerate
d)
velocity, gravity, inertia
67.

All objects have inertia

a)

True

b)

False

68.
A newton is equivalent to which of the following quantities?
a)
kg•m/s2
b)
kg•(m/s)2
c)
kg
d)
kg•m/s
69.
The free-body diagram represents a car being pulled by a towing cable. In the diagram, which
of the following is the gravitational force acting on the car?
a)
5800
b)
13 690
c)
14 700
d)
13 690 - 14 700   = -1110
70.

A late traveler rushes to catch a plane, pulling a suitcase with a force directed 30.0° above the horizontal. If the horizontal (x) component of the force on the suitcase is 60.6 N, what is the resultant applied force exerted on the handle? (hypotenuse)

a)
95.6
b)
53.0
c)
70.0
d)
65.2
71.

Using the gravity of earth at 9.81 m/s2 , how much does a person with a mass of 35 kg weigh in Newton's?

a)

0.28 N

b)

343 N

c)

3.57 N

d)

212 N

72.

If a 56 kg person on an unknown planet weighs 450 N , what must be the gravity on this planet?

a)

8.04 kg⋅m/s

b)

8.04 m/s2

c)

25,200 m/s2

d)

25,200 kg⋅m/s