A block of base 10 cm × 10 cm and height 15 cm is kept on an inclined plane. The coefficient of friction between them is 3 . The inclination θ of this inclined plane from the horizontal plane is gradually increased from 0 ° . Then

the block will remain at rest on the plane up to a certain θ and then it will topple.

at θ = 30 ° , the block will start sliding down the plane.

at θ = 60 ° , the block will start sliding down the plane and continue to do so at higher angles.

at θ = 60 ° , the block will start sliding down the plane and on further increasing θ , it will topple at certain θ .

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A box has to be dragged on a rough level with constant velocity by applying force $F$ making an angle $α$ with horizontal. The angle of friction is $θ$ , in order that the required force be minimum, we should have:

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Important Questions on Friction

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IMPORTANT

ISC Physics Class XI Part 1>Chapter 11 - Friction>QUESTIONS>Q 1

What is frictional force? What is it due to?

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ISC Physics Class XI Part 1>Chapter 11 - Friction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 9

An insect crawls up a hemispherical surface very slowly. The coefficient of friction between the insect and the surface is

1 / 3

. If the line joining the centre of the hemispherical surface to the insect makes an angle

α

with the vertical, then the maximum possible value of

α

is given by :

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ISC Physics Class XI Part 1>Chapter 11 - Friction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 10

A block of mass

m

is placed on a surface with a vertical cross-section given by

y = \frac{x^{3}}{6}

. If the coefficient of friction is

0.5

, the maximum height above the ground at which the block can be placed without slipping is:

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ISC Physics Class XI Part 1>Chapter 11 - Friction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 11

When a bicycle is in motion, the force of friction exerted by the ground on the two wheels acts:

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ISC Physics Class XI Part 1>Chapter 11 - Friction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 12

2 kg

block is placed on a rough surface inclined at

30 °

with the horizontal. If the coefficient of friction be

0.5

, the limiting frictional force acting on the block will be:

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ISC Physics Class XI Part 1>Chapter 11 - Friction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 13

Lubricants cannot reduce:

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ISC Physics Class XI Part 1>Chapter 11 - Friction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 15

A block of base

10 cm \times 10 cm

and height

15 cm

is kept on an inclined plane. The coefficient of friction between them is

\sqrt{3}

. The inclination

θ

of this inclined plane from the horizontal plane is gradually increased from

0 °

. Then

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IMPORTANT

ISC Physics Class XI Part 1>Chapter 11 - Friction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 16

A block of mass

m

is on an inclined plane of angle

θ

. The coefficient of friction between the block and the plane is

μ

and

\tan θ > μ

. The block is held stationary by applying a force

F

parallel to the plane. The direction of force pointing up the plane is taken to be positive. As

F

is varied from

F_{1} = m g (\sin θ - μ \cos θ) t o F_{2} = m g (\sin θ + μ \cos θ)

the frictional force

f

versus

F

graph will look like:

A box has to be dragged on a rough level with constant velocity by applying force F making an angle α with horizontal. The angle of friction is θ, in order that the required force be minimum, we should have:

Important Questions on Friction

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A box has to be dragged on a rough level with constant velocity by applying force $F$ making an angle $α$ with horizontal. The angle of friction is $θ$ , in order that the required force be minimum, we should have: