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CBSE Class 8 Science Worksheet

Friction

1.
State True or False: We can write on paper because of friction.
A) true B) false
2.
Choose the correct option: Frictional force depends on _________.
A) roughness of surface B) mass of the body C) Both 1 and 2 D) None of these
3.
Choose the correct option: Friction, that exists between two surfaces in contact, when there is no relative motion between them, is called _________.
A) Static friction B) Rolling friction C) Sliding friction D) None of these
4.
Choose the correct option: It is difficult to walk on a polished floor because friction between our feet and floor is __________.
A) increased B) decreased C) same D) None of these
5.
Fill in the blanks: Sole of shoes get worn out after a period of time because of _____________.
6.
Fill in the blanks: A car with worn out treads on tyres is more likely to skid due to ______________.
7.
State True or False: Fricition increases the efficiency of the machines.
A) true B) false
8.
Fill in the blanks: Friction can never be completely ____________.
9.

Blake is pulling a heavy box placed on a rough surface, as shown in the given figure. 

Blake is pulling the box by applying a force against

A)

His own body weight

 B)

Gravity

 C)

Friction

 D)

Rope
10.
Fill in the blanks: Sprinkling of powder on carrom board _______ friction.
11.
Choose the correct option: One way to increase friction is to use __________.
A) wax B) sand C) water D) oil
12.
Which force opposes the movement of an object when it travels through air or water?
A) Tension B) Pressure C) Drag D) Gravitational
13.
Why liquids and gases are called as fluid?
14.
State True or False: Friction opposes relative motion between the surfaces of the book and the table.
A) true B) false
15.
Why do kabbadi players rub their hands with soil?
16.
What is produced due to friction between moving parts of machine ?
A) Light B) Sound C) Electricity D) Heat
17.
Choose the correct option: A matchstick struck on a matchbox catches fire easily because __________.
A) force heated the match stick B) of chemical reaction C) friction may cause fire D) None of these
18.
Why do athletes use shoes with spikes?
19.
Fill in the blanks: Both gases and liquids are called __________.
20.
How fishes move easily in water?

CBSE Class 8 Science Worksheet

Friction

Answers

1.
Option A
2.
Option C
3.
Option B
4.
Option B

5.
friction
6.
less friction
7.
Option B

8.
eliminated
9.
Option B

10.
reduces
11.
Option B
12.
Option C

13.
Because they don't have definite shape.
14.
Option A

15.
In order to increase the friction so that they can grip the opposite team players firmly.
16.
Option D
17.
Option C

18.
In order to increase the friction so that the shoes don't slip while they run or play.
19.
fluid
20.
Because of streamlined shape.
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