Friction Test

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Friction Test - 4

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Weekly Quiz Competition

Question 1
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Which of the following is the cause of friction between two surfaces?

A
The force of attraction between the two surfaces in contact

B
The interlocking of the irregularities of the surfaces in contact

C
The force of repulsion between the two surfaces in contact

D
The gravitational pull of earth on the two surfaces

Solution

Force of friction between two surfaces is due to the interlocking of the irregularities of the surfaces in contact.
Question 2
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Rahul was trying to move a heavy block. He applied force but could not move the block. He then called Rohan, but both of them could not move the block. What conclusion can you draw from this?

A
Frictional force is still more than the applied force.

B
Frictional force is less than the applied force.

C
Frictional force is still equal to the applied force.

D
There is no relation between applied force and friction.

Solution

As the box is not moving, it means frictional force acting is static friction. So, frictional force acting on the block is equal to the applied force.
Question 3
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A boy rolls a rubber ball on the wooden floor. The ball travels a short distance before coming to rest. To make the same ball travel longer distance before coming to rest, he may

A
spread a carpet on the floor

B
cover the ball with a piece of cloth

C
sprinkle water on the floor

D
sprinkle sand on the floor

Solution

In order to make the ball travel longer distance, frictional force must be reduced. So, the boy must sprinkle water on the floor.
Question 4
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On a rainy day, Rahul wishes to go to the market. He is least likely to slip on the road with

A
path of loose soil

B
path laid with bricks

C
path laid with marble

D
None of these

Solution

Path laid with marbles and path with loose soil will be slippery as water will reduce the friction. So, he should take the path laid with bricks in order to go to market.
Question 5
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Identify the wrong statement.

A
Friction always opposes motion.

B
Friction always opposes relative motion between two surfaces.

C
Friction acts between two rough surfaces in contact with each other.

D
Friction always acts opposite to the direction of motion or intended motion.

Solution

Friction always opposes motion is the incorrect statement as the friction can produce the motion in the object.

Consider the following figure:

When the force is applied on the lower block, friction will come into action between the surface and lower block and, between the lower block and upper block. The friction between upper and lower block will cause the upper block to move with the lower block.
Question 6
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Which of the following relations is/are correct?

A
Rolling friction > Sliding friction

B
Rolling friction < Sliding friction

C
Limiting friction < Sliding friction

D
Both (1) and (3)

Solution

Rolling friction is always less than the sliding friction because in sliding friction layer rubs each other due to which a lot of kinetic energy is converted heat energy.
Question 7
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A book is placed on a table. What type of friction is acting on it?

A
Static friction

B
Dynamic friction

C
Viscous drag

D
No friction

Solution

When the object has no tendency of moving, there is no friction acting on it.
Question 8
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Read the following statements and select the correct option.

Statement A: Shapes of the cars are streamlined.
Statement B: Streamlined shape reduces the viscous drag.

A
Both the statements are correct and B is the correct explanation of A.

B
Both the statements are correct and B is not the correct explanation of A.

C
Statement A is incorrect and statement B is correct.

D
Both the statements are incorrect.

Solution

Shapes of the cars are streamlined because streamlining reduces the viscous drag.
Question 9
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Pick up the correct statement.

A
Friction acting on the object is same, when it is moving in air or water.

B
Friction acting on the object moving in air is more than the friction acting on the object moving in water.

C
Friction acting on the object moving in air is less than the friction acting on the object moving in water.

D
None of these

Solution

Friction acting on the object moving in air is less than the friction acting on the object moving in water because air is less dense and has less friction coefficient as compared to water.
Question 10
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Two identical steel balls are dropped in two beakers A and B. Beaker A is filled with water and Beaker B is filled with honey. Then,

A
steel balls will reach at bottom in equal time intervals in both A and B

B
the steel ball will take less time in B

C
the steel ball will take less time in A

D
the steel ball in honey will come to rest in midway

Solution

Friction between the steel ball and water is less as compared to the friction between the steel ball and the honey. So, steel ball will take less time in water as compared to the time taken in honey.
Question 11
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Soap solutions are used in high speed cutting and grinding because

A
it acts as a lubricant

B
it absorbs heat produced during cutting or grinding

C
it increases friction to facilitate cutting

D
Both (1) and (2) are correct

Solution

In the process of high speed cutting and grinding, friction acts between the two surfaces and large amount of heat is generated. So, soap solutions are used as a lubricant and they also absorb heat. Hence, they prevent the possible damage to the materials.
Question 12
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Brakes of automobiles do not work well during rainy season because

A
water acts as a lubricant between wheel drum and brake shoe

B
water destroys the wheel drum

C
we can't apply much force on brakes during rainy season

D
All of the above

Solution

The water in drum act as a lubricant because it reduces the friction between drum and break and reduce the effectiveness of break.
Question 13
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In which of the following situations friction is advantageous?

A. Writing on the black board
B. Riding on the vehicle
C. Brushing the teeth
D. Sliding a box on the inclined plane

A
Only A and B

B
Only A, B and C

C
Only A, B and D

D
All of these

Solution

We can write on the black board because of the friction between the chalk and the board.
Riding on the vehicle and brushing the teeth is possible due to the friction.
But during the sliding of the block on inclined plane, certain amount of energy is lost due to the sliding friction.
Question 14
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Pick up the correct statements.

A. Sprinkling of powder on carom board, fills up the irregularities in the board surface. Hence, it reduces the friction.
B. Saliva in our mouth helps us to swallow the food.
C. Flat tyres increase the grip in the roads.

A
Only A and C

B
Only A and B

C
Only B and C

D
All of above

Solution

Sprinkling of powder on carom board, fills up the irregularities in the board surface. Hence, it reduces the friction.
Saliva acts as a lubricant between the food and the mouth. Hence, it reduces the friction.
Question 15
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Which of the following instruments is used to measure force of friction?

A
Beam balance

B
Spring balance

C
Meter scale

D
Ordinary balance

Solution

Spring balance is used to measure the force of friction.
Question 16
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Directions: Read the given data and answer the following question.

Make an inclined plane on a smooth floor and put a mark with pen at any point A on the inclined plane. Let a pencil cell move down from this point and note down the distance. Now, spread a piece of woolen cloth on the plane and repeat the experiment noting the distance. Repeat this activity by spreading sand paper over it.

In which case does the pencil cell covers maximum distance?

A
Distance covered would be same in all caases

B
When woolen cloth is spread over the plane

C
When sand paper is spread on the plane

D
When nothing is spread on the plane

Solution

When nothing is spread on the plane, the force of friction is minimum.
Question 17
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Directions: Read the given data and answer the following question.

Make an inclined plane on a smooth floor and put a mark with pen at any point A on the inclined plane. Let a pencil cell move down from this point and note down the distance. Now, spread a piece of woolen cloth on the plane and repeat the experiment noting the distance. Repeat this activity by spreading sand paper over it.

In which case does the pencil cell covers minimum distance?

A
When woolen cloth is spread over the plane

B
When sand paper is spread on the plane

C
When nothing is spread on the plane

D
In all cases, distance covered is same

Solution

When woolen cloth is spread over the plane, it offers maximum frictional force. So, the distance covered by cell is minimum.
Question 18
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Why are brake pads used in the brake system of bicycles and automobiles?

A
To reduce friction

B
To increase friction

C
To reduce normal force

D
To prevent wearing of wheels

Solution

We deliberately increase friction by using brake pads in the brake system of bicycles and automobiles. When you are riding a bicycle, the brake pads do not touch the wheels. But when you press the brake lever, these pads arrest the motion of the rim due to friction and the wheel stops moving.
Question 19
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It is difficult to drag a bucket full of water than an empty bucket because

A
force of friction decreases as we drag a bucket full of water

B
force of friction increases with the increase of normal force due to increased weight

C
force of friction increases with the decrease of normal force due to increased weight

D
force of friction is independent of the weight of the body

Solution

The force of friction increases with the increase of normal force. Therefore, it is difficult to drag a bucket full of water than an empty bucket.
Question 20
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A bicycle is in motion. The force of friction exerted by the ground on its wheel is such that it acts

A
in backward direction on the front wheel and in forward direction on the rear wheel when it is accelerating

B
in forward direction on the front wheel and in backward direction on the rear wheel when brakes are applied on the rear wheel only

C
in backward direction on the front wheel and in forward direction on the rear wheel when brakes are applied on the rear wheel only

D
in backward direction on both the wheels when brakes are applied on both the wheels

Solution

When cycle accelerates, the rear wheel accelerates forward due to rotation. Hence, friction is forward. The front wheel tries to accelerate translationally without rotational motion hence friction is backward.
When breaks are applied to the rear wheel, the conditions are reversed.
If breaks are applied on both wheels, they try to skid over the road in forward direction. Hence, friction is in the backward direction for both the wheels.

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Friction Test - 4

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Friction Test - 4

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Question 1

The force of attraction between the two surfaces in contact

The interlocking of the irregularities of the surfaces in contact

The force of repulsion between the two surfaces in contact

The gravitational pull of earth on the two surfaces

Solution

Question 2

Frictional force is still more than the applied force.

Frictional force is less than the applied force.

Frictional force is still equal to the applied force.

There is no relation between applied force and friction.

Solution

Question 3

spread a carpet on the floor

cover the ball with a piece of cloth

sprinkle water on the floor

sprinkle sand on the floor

Solution

Question 4

path of loose soil

path laid with bricks

path laid with marble

None of these

Solution

Question 5

Friction always opposes motion.

Friction always opposes relative motion between two surfaces.

Friction acts between two rough surfaces in contact with each other.

Friction always acts opposite to the direction of motion or intended motion.

Solution

Question 6

Rolling friction > Sliding friction

Rolling friction < Sliding friction

Limiting friction < Sliding friction

Both (1) and (3)

Solution

Question 7

Static friction

Dynamic friction

Viscous drag

No friction

Solution

Question 8

Both the statements are correct and B is the correct explanation of A.

Both the statements are correct and B is not the correct explanation of A.

Statement A is incorrect and statement B is correct.

Both the statements are incorrect.

Solution

Question 9

Friction acting on the object is same, when it is moving in air or water.

Friction acting on the object moving in air is more than the friction acting on the object moving in water.

Friction acting on the object moving in air is less than the friction acting on the object moving in water.

None of these

Solution

Question 10

steel balls will reach at bottom in equal time intervals in both A and B

the steel ball will take less time in B

the steel ball will take less time in A

the steel ball in honey will come to rest in midway

Solution

Question 11

it acts as a lubricant

it absorbs heat produced during cutting or grinding

it increases friction to facilitate cutting

Both (1) and (2) are correct

Solution

Question 12

water acts as a lubricant between wheel drum and brake shoe

water destroys the wheel drum

we can't apply much force on brakes during rainy season

All of the above

Solution