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The ratio of the limiting force at friction- $F$ to the normal reaction- $R$ is known as

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Important Questions on Friction

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Physics>Mechanics>Friction>Friction

Which of the following surface in contact has maximum coefficient of friction

(μ)

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Physics>Mechanics>Friction>Friction

Given in the figure are two blocks

A

and

B

of weight

20 N

and

100 N

, respectively. These are being pressed against a wall by a force

F

and kept in equilibrium as shown. If the coefficient of friction between the blocks is

0.1

and between block

B

and the wall is

0.15

, the frictional force applied by the wall on block

B

is:

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Physics>Mechanics>Friction>Friction

A thin motorcyclist rides with sufficient speed in the vertical plane inside a hollow sphere of diameter

20 m

to prevent himself from sliding down. If the coefficient of friction is

0.5,

then what is the minimum speed of the motor cyclist? (use

g = 10 m s^{- 2}

)

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Physics>Mechanics>Friction>Friction

A block of mass

10 kg

starts sliding on a surface with an initial velocity of

9.8 {ms}^{- 1}

. The coefficient of friction between the surface and block is

0.5

. The distance covered by the block before coming to rest is :[use

g = 9.8 {ms}^{- 2}

]

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Physics>Mechanics>Friction>Friction

A body of mass

2 kg

is kept by pressing to a vertical wall by a force of

100 N

. The friction between wall and body is

0.3

. Then the frictional force is equal to

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Physics>Mechanics>Friction>Friction

Friction can be reduced by changing from

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Physics>Mechanics>Friction>Friction

A block placed on the horizontal is pushed momentarily with initial velocity

v

. The coefficient of friction between the block and surface is

μ

. Block will come to rest after a time

t

equal to (

g =

acceleration due to gravity)

MEDIUM

Physics>Mechanics>Friction>Friction

A car is negotiating a curved road of radius

R

. The road is banked at an angle

θ

. The coefficient of friction between the tyres of the car and the road is

μ_{s}

. The maximum safe velocity on this road is:

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Physics>Mechanics>Friction>Friction

A block is released from rest on a

45 °

smooth incline and slide a distance

d

. The time taken to slide the same distance is

n

times as much to slide on a

45 °

rough incline than on the smooth incline. The coefficients of friction for the rough incline is

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Physics>Mechanics>Friction>Friction

A block rests on a rough inclined plane making an angle of

30 °

with the horizontal. The coefficient of static friction between the block and the plane is

0.8

. If the frictional force on the block is

10 N

, the mass of the block is

(g = 10 m s^{- 2})

HARD

Physics>Mechanics>Friction>Friction

A given object takes

n

times more time to slide down a

45^{o}

rough inclined plane as it takes to slide down a perfectly smooth

45^{o}

incline. The coefficient of kinetic friction between the object and the incline is:

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Physics>Mechanics>Friction>Friction

Which one of the following statements is incorrect?

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Physics>Mechanics>Friction>Friction

The coefficient of friction between two surfaces is

μ = 0.8

. The tension in the string shown in the figure is -
Question Image

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Physics>Mechanics>Friction>Friction

Frictional forces act in a direction

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Physics>Mechanics>Friction>Friction

A block of mass

10 kg

is kept on a rough inclined plane as shown in the figure. A force of

3 N

is applied on the block. The coefficient of static friction between the plane and the block is

0.6 .

What should be the minimum value of force

P,

such that the block does not move downward? (take

g = 10 m s^{- 2}

)

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Physics>Mechanics>Friction>Friction

A block

A

of mass

m_{1}

rests on a horizontal table. A light string connected to it passes over a frictionless pulley at the edge of table and from its other end another block

B

of mass

m_{2}

is suspended. The coefficient of kinetic friction between the block and the table is

μ_{k}

. When the block

B

is sliding on the table, the tension in string is:

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Physics>Mechanics>Friction>Friction

A plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with the horizontal reaches

30 °

, the box starts to slip and slides

4.0 m

down the plank in

4.0 s

. The coefficients of static and kinetic friction between the box and the plank will be, respectively:
Question Image

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Physics>Mechanics>Friction>Friction

Meena applies the front brakes while riding on her bicycle along a flat road. The force that slows her bicycle is provided by the

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Physics>Mechanics>Friction>Friction

A block A of mass 4 kg is placed on another block B of mass 5 kg, and the block B rests on a smooth horizontal table. If the minimum force that can be applied on A so that both the blocks move together is 12 N, the maximum force that can be applied on B for the blocks to move together will be :

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Physics>Mechanics>Friction>Friction

Which of the following is a self adjusting force?

The ratio of the limiting force at friction- F to the normal reaction-R is known as

Important Questions on Friction

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The ratio of the limiting force at friction- $F$ to the normal reaction- $R$ is known as