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Physical Science Unit 07: Forces (Chapter 05) Review

Total questions: 50

Worksheet time: 2hrs 45mins

Name
Class
Date
1.

What is the net force?

a)

5 N

b)

45 N to the left

c)

5 N to the right

d)

45 N to the right

2.

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

3.
Which one is balanced?
a)
top
b)
bottom
c)
both
4.
Is it BALANCED? 
a)
Yes
b)
No
5.
What is the FORCE? 
a)
5 N
b)
10 N
c)
400 N
d)
0 N
6.

What is the unit for FORCE?

a)

N (Newtons)

b)

lbs (pounds)

c)

g (grams)

d)

m/s (meters per second)

7.

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

8.
This is an example of what kind of force?
a)
Balanced Force
b)
Pushing Force
c)
Gravity Force
d)
Unbalanced Force
9.
What is the net force?
a)
17 N Right
b)
3 N Right
c)
3 N Left
d)
17 N Left
10.
What is the net force?
a)
65 N left
b)
65 N right
c)
35 N left
d)
35 N right
11.
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
12.
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
13.
What is the net force?
a)
11 N left
b)
11 N right
c)
3 N left
d)
3 N right
14.
What is the net force?
a)
3 N left
b)
3 N right
c)
7 N left
d)
7 N right
15.
What is the net force?
a)
1.3 N left
b)
1.3 N right
c)
3.7 N left
d)
3.7 N right
16.
The graph shows how the speed of an object changed over time. During which segments of this graph were the forces acting on the object balanced?
a)
R only
b)
Q and S
c)
R and T
d)
R, S and T
17.
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.
18.
Is this a balanced or unbalanced force?
a)
Balanced
b)
Unbalanced
c)
Neither
d)
Both
19.
Which direction will the object move?
a)
Right
b)
Left
c)
Up
d)
Down
20.
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
21.
What is the magnitude (size) and direction of the net force?
a)
21 N to the Left
b)
3 N to the Left
c)
21 N to the Right
d)
3 N to the Right
22.

Two people are pushing a disabled car. One exerts a force of 200 N east, the other a force of 150 N east. What is the net force exerted on the car?

a)

50 N east

b)

350 N east

c)

50 N west

d)

350 N west

23.

Mrs. Moran and Mr. Moran decided to move their refrigerator . Mrs. Moran stood on one side, and Mr. Moran stood on the other. They each pushed with 100 N of force. What was the net force on the refrigerator?

a)

0 N

b)

60 N

c)

30 N

d)

90 N

24.

Which of the following could cause an acceleration?

a)

A balance between two forces

b)

A balance between three forces

c)

An imbalance between two forces

d)

Zero forces

25.
We often say that g = -9.8 m/s2. The lowercase g represents:
a)
the speed of gravity
b)
the velocity of gravity
c)
the acceleration of gravity
d)
the force of gravity
26.
Fill in the blanks: _____ does not change from place to place, but _____ can change because of differences in the strength of gravitational pull.
a)
acceleration, weight
b)
weight, acceleration
c)
mass, weight
d)
weight, mass
27.
A book rests on a table. The normal force points:
a)
Up
b)
Down
c)
Left
d)
Right
28.
The air resistance and weight as shown for the skydiver are balanced. The skydiver is probably:
a)
at rest
b)
moving at constant velocity
c)
accelerating upward
d)
accelerating downward
29.
A 0.2kg mass hangs from a Newtons spring scale. The spring scale will read:
a)
0.2 N
b)
1 N
c)
1.96 N
d)
6.28 N
30.

A type of friction that occurs when air pushes against a moving object causing it to negatively accelerate

a)

surface area

b)

air resistance

c)

descent velocity

d)

gravity

31.

The rougher the surface, the faster an object will travel over the surface.

a)

True

b)

False

32.

Which of the following statements is false?

a)

Friction can only slow things down

b)

Friction is never useful

c)

Friction can stop things from moving

33.

What type of friction is displayed when you move a couch across the floor?

a)

Sliding

b)

Rolling

c)

Static

d)

There is no friction

34.

Which of the following is a true statement regarding springs?

a)

The higher the value of the spring constant, the stiffer the spring.

b)

In Hooke's law, the force exerted by the spring acts in the same direction as displacement.

c)

Springs are designed to provide unpredictable variations in force.

d)

The force exerted by a spring has a quadratic relationship with the displacement form equilibrium.

35.
If extension = Stretched length - original length. What is the extension of spring D.
a)
1mm
b)
2mm
c)
3mm
d)
0mm
36.

A graph of extension against force for an elastic material is:

a)

A downward curve

b)

An upward curve

c)

A straight line from any point on the x and y axis

d)

A straight line from the origin

37.

As the hand pulls down on the mass, the spring constant _______, assuming that it doesn't pass the elastic limit of the spring.

a)

increases

b)

decreases

c)

remains roughly constant

d)

needs more information

38.

What is the definition of "weight"?

a)

measure of the force of gravity on your body

b)

the time it takes to get on a ride

c)

the amount of matter in an object

d)

the size of an object

39.

A measure of how much matter an object has is--

a)

weight

b)

gravity

c)

mass

d)

volume

40.

The mass of an object ___________ as it moves away from the center of Earth

a)

stays the same

b)

decreases

c)

increases

d)

doubles

41.

The weight of an object _________ as it moves away from the center of Earth.

a)

increases

b)

stays the same

c)

triples

d)

decreases

42.

The unit that weight is measured in.

a)

Kilogram

b)

Newton

c)

Milliliter

d)

Mile

43.

A feather and a bowling ball drop at the same rate on the moon (meaning they will hit the ground at the same time). Why is this?

a)

Voodoo Magic

b)

There is no air resistance on the moon (so no air friction)

c)

The force of gravity is less on the moon

d)

The force of gravity is greater on the moon

44.

What is the weight of a 15 kg object on earth? (Use g= 9.8 m/s2)

a)

147 N

b)

.65 N

c)

1.53 N

d)

207 N

45.

If an object's mass = 30 kg on the Earth, what would be it's weight on Earth?

a)

3 kg

b)

300 kg

c)

3 N

d)

300 N

46.

An object weighs 340 N. What is its mass?

a)

340 kg

b)

340 N

c)

34 kg

d)

34 N

47.

In physics, the weight equation is _____________.

a)

Weight=Mass×Gravity

b)

Mass=Weight×Gravity

c)

Gravity=Mass×Weight

48.

An astronaut with all of the necessary gear has a weight of 2,250 N on Earth (acceleration due to gravity on Earth is 9.8 m/s/s). If the acceleration due to gravity is 1.63 m/s/s on the Moon, what would the astronaut weigh on the surface of the Moon?

a)

375 N

b)

519 N

c)

950 N

d)

2150 N

49.

An airplane flies east at 400 km/hr. In which direction is the air resistance force acting upon the airplane?

a)

East

b)

West

c)

Up

d)

Down

50.

When a falling object stops accelerating and falls at a constant speed, it is

a)

fluency

b)

constant velocity

c)

acceleration

d)

terminal velocity

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