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 not the factor influencing friction between two surfaces?

A
Magnitude of forces holding the two surfaces

B
Amount of surface area in contact between two moving surfaces

C
Degree of irregularities between two surfaces in contact

D
Both B and C

Solution

The amount of surface in contact between two surface does not influence the magnitude of friction force.

The force of friction depends on the magnitude of force acting on the surfaces, the degree of irregularities and the coefficient of friction.
Question 2
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Force of _______ prevents the surfaces from sliding or slipping across each other.

A
gravity

B
friction

C
atom

D
charge

Solution

The force of friction is responsible for preventing the motion of two surfaces across each other.
Question 3
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Friction is a force that acts in ________ direction of the intended motion of an object.

A
Parallel

B
Opposite

C
Same

D
Perpendicular

Solution

The friction force acting on an object acts in an opposite direction of the intended motion of the object. It prevents the motion of the block in that direction.
Question 4
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Ankit is advised to sprinkle fine powder on the carom board for smooth movement of the coins. He was asked to do so because,

A
Sprinkling powder on the board reduces the player’s effort to make shots

B
Powder on the carom board protect the fingers of the players from getting hurt.

C
the presence of powder between the coin and the surface of the board reduces friction

D
Both A and C

Solution

The presence of fine particles of powder sprinkled on the board reduces friction between the coin and the surface of the board. Due to the lack of the friction the players are no longer required to put great efforts to make shots. Loss of friction consequently reduce the effort to make shots.

Therefore, option D is the correct answer.
Question 5
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Zaza observed that on rubbing hands during winter makes him feel warm. The above observation suggests that friction generates ________ energy

A
Potential

B
Kinetic

C
Heat

D
Electric energy

Solution

The rubbing of hands generates energy that makes the person feel warmth during the winters. It is an example of conversion of friction force into heat energy.
Question 6
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What type of a force is friction?

A
Contact force

B
Non-contact force

C
Electrostatic force

D
Magnetic force

Solution

Frictional force is always between two surfaces in contact with each other. Therefore, friction force is a contact force.
Question 7
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Which of the following reduces friction in a rotating machine?

A
Wheels

B
Rollers

C
Ball bearings

D
Handle

Solution

A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races. The purpose of a ball bearing is to reduce rotational friction and support the load the machine is subjected to. The ball bearing offers rolling friction which is the least of all the other friction. Hence, only option C is the correct answer.
Question 8
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Which of the following statements is NOT true?

A
Friction can be reduced by converting sliding friction into rolling friction.

B
Friction in air and water can be reduced by streamlining the shape of the objects.

C
A polished surface will have less friction.

D
Friction can be reduced to zero.

Solution

The statement A, B and C are true. Friction can be reduced by converting the sliding friction into rolling friction as the sliding friction is the least among all the other type of friction. A streamlined shape helps reducing the fluid friction. Therefore, option B is also true.

A polished surface reduces the friction by eliminating the irregularity between the two surface in contact.

Although it is impossible to ever reduce the friction between the two surface to zero. Hence, statement D is the only incorrect statement.
Question 9
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Why are tyres made circular in shape?

A
It is easy to inflate circular tyres.

B
Rolling friction is less than sliding friction.

C
Circular tyres dissipate less heat.

D
Circular tyres easily slow down or stop a vehicle.

Solution

Rolling friction is the force resisting the motion when a body (such as a ball, tire, or wheel) rolls on a surface. Sliding friction is the force resisting the motion when a body slides on a surface. The force of friction depends on the area of contact between the two surfaces. As the area of contact is less in the case of rolling than in the case of sliding, rolling friction is less than the sliding friction.

Hence, option B is the correct answer.
Question 10
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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 therefore reaches the ground faster.

Thus option C is the correct answer.

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Re-Attempt Weekly Quiz Competition

Friction Test - 4

Result

Friction Test - 4

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SHARING IS CARING

Question 1

Magnitude of forces holding the two surfaces

Amount of surface area in contact between two moving surfaces

Degree of irregularities between two surfaces in contact

Both B and C

Solution

Question 2

gravity

friction

atom

charge

Solution

Question 3

Parallel

Opposite

Same

Perpendicular

Solution

Question 4

Sprinkling powder on the board reduces the player’s effort to make shots

Powder on the carom board protect the fingers of the players from getting hurt.

the presence of powder between the coin and the surface of the board reduces friction

Both A and C

Solution

Question 5

Potential

Kinetic

Heat

Electric energy

Solution

Question 6

Contact force

Non-contact force

Electrostatic force

Magnetic force

Solution

Question 7

Wheels

Rollers

Ball bearings

Handle

Solution

Question 8

Friction can be reduced by converting sliding friction into rolling friction.

Friction in air and water can be reduced by streamlining the shape of the objects.

A polished surface will have less friction.

Friction can be reduced to zero.

Solution

Question 9

It is easy to inflate circular tyres.

Rolling friction is less than sliding friction.

Circular tyres dissipate less heat.

Circular tyres easily slow down or stop a vehicle.

Solution

Question 10

Gravitational force is less in the case of the coin.

Mass of coin is less.

Frictional force is less in the case of the coin.

Magnetic force is stronger in the case of the coin.

Solution

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