Laws of Motion-Laws of Friction (KVPY Stream-SA (Class 11) Physics): Questions 1 - 4 of 5

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Question number: 1

» Laws of Motion » Laws of Friction

Appeared in Year: 2012

MCQ▾

Question

A girl holds a book of mass m against a vertical wall with a horizontal force F using her finger so that the book does not move. The frictional force on the book by the wall is:

Choices

Choice (4) Response

a.

Equal and opposite to the resultant of F and mg

b.

μF upwards where μ is the coefficient of static friction

c.

mg and upwards

d.

F and along the finger but pointing towards the girl

Question number: 2

» Laws of Motion » Laws of Friction

MCQ▾

Question

A box when dropped from a certain height reaches the ground with a speed V. When it slides from rest from the same height down a rough inclined plane inclined at an angle 60° to the horizontal, it reaches the ground with a speed V2 . The coefficient of sliding friction between the box and the plane is (acceleration due to gravity is 10 ms-2)

Choices

Choice (4) Response

a.

324

b.

32

c.

334

d.

332

Question number: 3

» Laws of Motion » Laws of Friction

MCQ▾

Question

A body moving on a rough horizontal surface comes to a stop in a distance 22 m. If the initial kinetic energy is 66 J, the force of the friction exerted on the body is –

Choices

Choice (4) Response

a.

3 N

b.

2 N

c.

5 N

d.

4 N

Question number: 4

» Laws of Motion » Laws of Friction

MCQ▾

Question

A block of mass 3 kg slides on an inclined plane making an angle of 300 with the horizontal. The coefficient of friction between the block and the surface is 23 . The force required to be applied to the block so that it moves down without any acceleration is –

Choices

Choice (4) Response

a.

2.27

b.

3.25

c.

2.0

d.

1.87

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