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Friction CBSE 85

Total questions: 46

Worksheet time: 31mins

Name
Class
Date
1.

Sports men especially footballer's use spiked shoes to ______friction

a)

Increase

b)

Decrease

c)

Keep constant

d)

None

2.

When the applied force more than the limit of________friction the body starts to moves

a)

sliding

b)

fluid

c)

rolling

d)

static

3.

Friction is independent of__________

a)

roughness of surface

b)

normal force

c)

area of contact

d)

all of them

4.

The frictional force exerted by fluids is also called as_______

a)

Rolling friction

b)

sliding friction

c)

static friction

d)

drag

5.

It is always________to roll a body than to slide it over a surface

a)

difficult

b)

easier

c)

hard

d)

tough

6.

A force that opposes motion between any surfaces that are in contact.

a)

gravity

b)

acceleration

c)

friction

d)

direction

7.

Which type of friction is shown in the picture?

a)

rolling

b)

fluid

c)

static

d)

sliding

8.

Which type of friction is shown in the picture?

a)

fluid

b)

static

c)

rolling

d)

sliding

9.

If the following objects were dropped from the same height, which one would hit the floor first?

a)
b)
c)
10.

Which type of friction is shown in the picture?

a)

rolling

b)

static

c)

fluid

d)

sliding

11.

Adding oil will ________ friction on gear chains.

a)

increase

b)

decrease

12.

Which type of friction is shown in the picture?

a)

fluid

b)

static

c)

rolling

d)

sliding

13.

Which boy A or B will slide down faster

a)

A

b)

B

c)

A and B

14.

What does the strength of the force depend on? Check the answers that apply.

a)

The types of surfaces

b)

The weather

c)

How hard the surfaces push together

d)

motion

15.

A hard wood floor has more friction than a carpet.

a)

true

b)

false

16.

_____________ friction acts on objects that are not moving.

a)

sliding

b)

rolling

c)

static

d)

fluid

17.

Sliding friction is when two _____________ surfaces slide over one another.

a)

liquid

b)

oil

c)

solid

18.

Rolling friction is when an object ___________ over a surface.

a)

bounces

b)

rolls

c)

slides

19.

Fluid friction happens with objects moving through ______________ or ___________________.

a)

gases or liquids

b)

solids or liquids

c)

gases or solids

20.

Air resistance is a type of fluid friction.

a)

True

b)

False

21.

Static friction prevents you from slipping when you walk on a sidewalk.

a)

True

b)

False

22.

You can move heavy boxes by sliding them over the ground, or you can put them on a dolly and then roll them over the ground. Which way makes it easier to move the boxes? Why?

a)

Sliding the boxes on the floor is easier than using the dolly because rolling friction is less than sliding friction

b)

Sliding the boxes on the floor is easier than using the dolly because sliding friction is less than rolling friction.

c)

Rolling the boxes over the floor on the dolly is easier because sliding friction is less than rolling friction.

d)

Rolling the boxes over the floor on the dolly is easier because rolling friction is less than sliding friction.

23.

You use _____ friction when you leave marks on paper with a pencil “lead.”

a)

static friction.

b)

sliding friction.

c)

rolling friction.

24.

Sliding friction is stronger than static friction.

a)

TRUE

b)

FALSE

25.

The weakest type of friction that occurs between solid surfaces is _____ friction.

a)

sliding friction

b)

rolling friction

c)

static friction

d)

None of the above

26.

The friction force acts in the ...................... direction of movement

a)

Same

b)

Opposite

c)

sometime Opposite

27.

True or False: objects that are smooth have LESS friction than objects that are rough

a)

TRUE

b)

FALSE

28.
Wheels on a skateboard most likely experiences-
a)
Rolling Friction
b)
Sliding Friction
c)
Fluid Friction
d)
Static Friction
29.
Sally experiences-
a)
Rolling Friction
b)
Sliding Friction
c)
Fluid Friction
d)
Static Friction
30.
Wheels of a shopping cart experience-
a)
Rolling Friction
b)
Sliding Friction
c)
Fluid Friction
d)
Static Friction
31.
Swimming fish experience-
a)
Rolling Friction
b)
Sliding Friction
c)
Fluid Friction
d)
Static Friction
32.
The rougher the surface, the faster an object will travel over the surface.
a)
True
b)
False
33.

Friction is an example of _____________

a)

contact force

b)

non contact force

c)

both of these

d)

none of these

34.

Which of these materials do you predict would have the MOST amount of friction?

a)

metal

b)

tile

c)

sand paper

d)

denim

35.

Rough surfaces have _________

a)

greater friction

b)

less friction

c)

the same level of friction

36.

When we rub our hands together _________.

a)

frictional force works between them

b)

energy is released

c)

our hands become warm

d)

all off the above

37.
Which of the following is an example of friction that is helpful?
a)
Brakes used on a bike
b)
Tires from a car on the road
c)
Tread on the bottom of your shoes
d)
All are examples that are helpful
38.
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
39.

There are _________ types of friction.

a)

2

b)

1

c)

4

d)

5

40.
How can friction be reduced?
a)
reduce the force acting between the 2 surfaces
b)
reduce the roughness of the 2 surfaces coming in contact
c)
use wax, grease or oil
d)
all of the above are ways of reducing friction
41.

To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable?

a)

Stone

b)

Plastic block

c)

There is no need to sharpen a knife

d)

Glass block

42.

It is difficult to walk on an oily floor because

a)

Floor gets spoiled

b)

Floor hates oil so it makes it difficult to walk on it until oil is removed

c)

Force of friction is high

d)

Force of friction is very less

43.

Spring balance is a device used for measuring the _____________ acting on an object.

a)

number of molecules or atoms

b)

weight

c)

force

d)

food

44.

A matchstick struck on a matchbox catches fire easily because

a)

Friction produces heat

b)

Of chemical reaction

c)

Matchstick is afraid of us

d)

Matchstick obeys us because we are their masters

45.

Friction has only disadvantages

a)

True

b)

False

c)

Don't ask me!!

46.

Friction increases with

a)

Roughness of surface area in contact

b)

Normal force

c)

Area of contact

d)

Only 1 & 2

e)

All of the above

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