ISC Physics Class XI Part 1>Chapter 11 - Friction>QUESTIONS>Q 4

MEDIUM

11th ICSE

IMPORTANT

Earn 100

Explain the terms static friction and kinetic friction.

Important Questions on Friction

EASY

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 11 - Friction>QUESTIONS>Q 5

‘Friction is a necessary evil.’ Comment.

MEDIUM

11th ICSE

IMPORTANT

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

A body rolled on a surface with a speed of

10 {ms}^{- 1}

comes to rest after covering a distance of

50 m

. Find the coefficient of friction. Take

g = 10 {ms}^{- 2}

.

HARD

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 11 - Friction>NUMERICALS>Q 2

A block of mass

1.5 kg

placed on a rough horizontal surface is pulled by a constant horizontal force of

1.2 kg f

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

0.3

. Find the acceleration produced in terms of

g

.

HARD

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 11 - Friction>NUMERICALS>Q 3

Two blocks, each of mass

3.0 kg

, are connected by a light cord and placed on a rough horizontal surface. When a horizontal force of

20 N

is applied on a block, an acceleration of

0.50 {ms}^{- 2}

is produced in each block. Find the tension in the string and the frictional force which is same on the two blocks.

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 11 - Friction>NUMERICALS>Q 4

A car is moving on a straight road at a speed of

20 {ms}^{- 1}

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

0.4

. Find the shortest distance within which the car can be stopped,

(g = 10 {ms}^{- 1})

.

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 11 - Friction>NUMERICALS>Q 6

A fireman of mass

80 kg

slides down a pole during a rescue mission. The force of friction is constant at

720 N

. Find the acceleration of the man.

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

HARD

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 11 - Friction>NUMERICALS>Q 8

A block rests on a plane of variable inclination. Find the inclination of the plane with the horizontal at which the block just slides down. The coefficient of friction between the block and the plane is

μ = \frac{1}{\sqrt{3}}

.

HARD

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 11 - Friction>NUMERICALS>Q 9

A block of mass

0.05 kg

when placed on a rough

15 °

inclined plane slides down without acceleration. The inclination is then increased to

30 °

. What would be the acceleration of the block ?

g = 9.8 m / s^{2}