Friction Test

Result

Friction Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

When a coin and a feather are dropped simultaneously from the same height, the coin strikes the ground first. Why?

A
Gravitational force is less in the case of the coin.

B
Mass of coin is less.

C
Frictional force is less in the case of the coin.

D
Magnetic force is stronger in the case of the coin.

Solution

Due to larger surface area, the feather faces more air resistance (friction by air) and hence slows down, while the coin moves faster and touches the ground faster.
Question 2
1 / -0

Why do the soles of our shoes easily wear out?

A
Due to the difference in the material of the sole

B
Due to poor design

C
Due to friction

D
Due to their size

Solution

When we walk on the road, the friction between the soles of our shoes and the road wears out the soles.
Question 3
1 / -0

When does a body have zero force of friction?

A
When no force is applied on a body at rest

B
When a large force is applied on a body

C
When a body is rolling on the surface

D
When a body is sliding on the surface

Solution

Friction is the relative motion between two surfaces in contact. So, a body has zero force of friction when it is at rest, i.e. when no force is applied on it.
Question 4
1 / -0

In which of the following does friction play a helpful role?

(i) Striking a match stick
(ii) Playing snooker
(iii) Writing on the blackboard

A
Only (i) and (ii)

B
Only (ii) and (iii)

C
Only (i), and (iii)

D
(i), (ii) and (iii)

Solution

Friction plays an important role in the striking of a match stick, playing snooker and writing on the black board.
Question 5
1 / -0

Which of the following shows that friction exists between the two bodies?

A
When the movement is decreased or prevented

B
When there is a constant movement

C
When electromagnetic charges are produced

D
When there is a constant increase in weight

Solution

Friction is the relative force between two surfaces in contact, which causes the decrease in the movement of a body or sometimes may even prevent the motion.