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QUIZ: FORCES 8TH GRADE

Total questions: 40

Worksheet time: 31mins

Name
Class
Date
1.

Gravity... (select all the correct answers)

a)

Is a force that pulls all objects in earth to it's center

b)

is a force that is inside your body that attracts objects near to you

c)

Is the force with which all objects attract each other by simply having mass

d)

At earth is equal to 9.8 m/s^2

2.

Gravity is a... (There are 2 correct!)

a)

Push force

b)

Pull force

c)

Contact force

d)

Non-contact force

3.

These are types of contact forces (select all the correct answers)

a)

Normal force

b)

Gravity force

c)

Applied force

d)

Frictional force

4.

Which is the acceleration of gravity at earth?

a)

9.8 J9.8\ J

b)

9.8 N9.8\ N

c)

9.8 ms29.8\ \frac{m}{s^2}

d)

9.8 ms9.8\ \frac{m}{s}

5.

What is a black hole and which are its characteristics?

a)

Is a small amount of matter packed in a big area. It's mass and it's density are high.

b)

Is a small amount of matter packed in a small area. It's mass and it's density are high.

c)

Is a great amount of matter packed in a small area. It's mass and it's density are high.

d)

Is a great amount of matter packed in a great area. It's mass and it's density are high.

6.

Weight

a)

Is the push of gravity which the earth attracts objects. Is measured in N

b)

Is the pull of gravity which the earth attracts objects. Is measured in N

c)

Is the pull of gravity which the earth attracts objects. Is measured in J

d)

Is the pull of gravity which the earth attracts objects. Is measured in Kg

7.

Weight formula

a)

W=m⋅gW=m\cdot g

b)

W=m⋅aW=m\cdot a

c)

W=m⋅dW=m\cdot d

d)

W=n⋅gW=n\cdot g

8.

If the formula of Weight is W=mg, which is the weight of an object of 2 kg in the earth?

a)

18.9 N

b)

19.6 N

c)

19.8 N

d)

16.5 N

9.

Which is the gravity acceleration of my planet if my mass is 60 kg and my weight is 210 N

a)

13.5 ms213.5\ \frac{m}{s^2}

b)

2.5 ms22.5\ \frac{m}{s^2}

c)

5.5 ms25.5\ \frac{m}{s^2}

d)

3.5 ms23.5\ \frac{m}{s^2}

10.

Forces are invisible, they can only be perceived through the effects they cause.

a)

TRUE

b)

FALSE

11.

There are two participants for a force to be present: (select all correct answers)

a)

Other that changes its motion

b)

One to change the shape

c)

One to exert it

d)

Other to recieve it

12.

Which is the name of this diagram?

(a)  

13.

What is going to happen with this object acording to the forces applied?

a)

The object will go to the left

b)

The object will go to the right

c)

The object will float

d)

The object will sink

e)

The object remains still

14.

The earth exerts a Gravitational Force that pull the object downwards. This force is well known as (a)   and it depends of the mass of the object

15.

The (a)   force, is the one that the surface on which the object is sitting exerts that prevents its sinking down

16.

When something does not change its shape or motion, it can be at rest or in a constant speed (like in space). That means the object...(select two options)

a)

Has acceleration

b)

Doesn't move

c)

Has a Net Force = 0

d)

Is balanced or in equilibrium

17.

Force is a push or (a)   in an object that results from the interaction with another object

18.

Force that resists motion when the surface of one object comes in contact with the surface of another.

a)

Applied force

b)

Gravity force

c)

Friction

d)

Normal

19.

What device is used to measure forces?

a)

Thermometer

b)

Dynamometer

c)

Voltmeter

d)

Barometer

20.

What is the unit of measurement for force?

a)

Kilogram (kg)

b)

Newton (N)

c)

Joule (J)

d)

Pascal (Pa)

21.

What is needed for a force to exist?

a)

A moving object

b)

Two interacting objects

c)

A single object

d)

A stationary object

22.

What type of forces are action-at-a-distance forces?

a)

Forces that only act on solids

b)

Forces that do not require physical contact

c)

Forces that only act on liquids

d)

Forces that require physical contact

23.

In the context of forces, what does 'receiver' refer to?

a)

The object that applies the force

b)

The object that is stationary

c)

The object that experiences the force

d)

The object that is in motion

24.

What type of force is the normal force?

a)

Contact force

b)

Action-at-a-distance force

c)

Electromagnetic force

d)

Nuclear force

25.

What type of force is air resistance?

a)

Non-contact force

b)

Frictional force

c)

Contact force

d)

Gravitational force

26.

Pressure can be given as?

a)

Force x Area

b)

Area / Force

c)

Force / Area

d)

None

27.

Unit of pressure is?

a)

N/m2

b)

Pascal

c)

Both N/m2 and Pascal

d)

Square meter

28.

10 N/m2 of pressure can also be written as?

a)

100 pascals

b)

10 pascals

c)

1 pascal

d)

1000 pascals

29.

Force of a person sleeping on a bed is 500N. Area is 4 m2

a)

100 pascals

b)

115 pascals

c)

125 pascals

d)

150 pascals

30.

Pressure can be measured in Pascals (Pa) or Newtons per square meter.

1 Pa = 1N/m2

a)

True

b)

False

31.
A person wearing steel toe capped boots and a person wearing stilleto heels stand on a wooden floor. They both have the same weight. Which person exerts a greater pressure on the floor?
a)
The person wearing the boots because the boots have a larger surface area in contact with the floor
b)
The person with the stiletto heels because they have a larger surface area in contact with the floor
c)
The person wearing the boots because the boots have a smaller surface area in contact with the floor 
d)
The person with the stiletto heels because they have a smaller surface area in contact with the floor
32.
Which of these animals would probably cause the greatest pressure on the ground?
a)
A fat cow with big feet
b)
A fat cow with small feet
c)
 A calf with big feet
d)
A calf with small feet
33.

What pressure does a 400N horse exert on the ground if each foot is 10cm2?

a)

400,000 N

b)

40,000 Pa

c)

400 Pa

d)

4,000 Pa

34.

8 N to the left , and 4 N to the right. Find the net force. Is this balanced?

a)
12 N Right  No
b)
4 N Left  No
c)
12 N Right  Yes
d)
4 N Left  Yes
35.

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

a)

the forces are balanced

b)

the object is free-falling

c)

the object is moving upward

d)

the forces are unbalanced

36.

What is the NET FORCE of this diagram?

a)

17 N, right

b)

17 N, left

c)

23 N, right

d)

12 N, up

37.
Name the missing force...
a)
tension force
b)
frictional force
c)
normal force
d)
spring force
38.
Name the missing force...
a)
weight force
b)
normal force
c)
applied force
d)
frictional force
39.
Name the missing force...
a)
frictional force
b)
weight force
c)

air resistance

d)

net force

40.
Name the missing force...
a)
applied force
b)
weight force
c)
lift
d)
normal force

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