Friction Test

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Friction Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

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 2
1 / -0

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 3
1 / -0

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 4
1 / -0

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 5
1 / -0

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 6
1 / -0

Directions For Questions

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.

...view full instructions

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 7
1 / -0

Directions For Questions

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.

...view full instructions

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 8
1 / -0

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 9
1 / -0

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 10
1 / -0

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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Re-Attempt Weekly Quiz Competition

Friction Test - 2

Result

Friction Test - 2

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SHARING IS CARING

Question 1

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 2

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

Question 3

Only A and B

Only A, B and C

Only A, B and D

All of these

Solution

Question 4

Only A and C

Only A and B

Only B and C

All of above

Solution

Question 5

Beam balance

Spring balance

Meter scale

Ordinary balance

Solution

Question 6

Distance covered would be same in all caases

When woolen cloth is spread over the plane

When sand paper is spread on the plane

When nothing is spread on the plane

Solution

Question 7

When woolen cloth is spread over the plane

When sand paper is spread on the plane

When nothing is spread on the plane

In all cases, distance covered is same

Solution

Question 8

To reduce friction

To increase friction

To reduce normal force

To prevent wearing of wheels

Solution

Question 9

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

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

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

force of friction is independent of the weight of the body

Solution

Question 10

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

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

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

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

Solution

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