# Laws of Motion-Laws of Friction (KVPY (Kishore Vaigyanik Protsahan Yojana) 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. 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.

b.

c.

d.

## 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. 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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