# Laws of Motion (KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics): Questions 5 - 8 of 21

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## Question number: 5

» 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: 6

» Laws of Motion » Static and Kinetic Friction

Appeared in Year: 2012

MCQ▾

### Question

A block of mass m is sliding down an inclined plane with constant speed. At a certain instant t0, its height above the ground is h. The coefficient of kinetic friction between the block and the plane is μ. If the block reaches the ground at a later instant tg, then the energy dissipated by friction in the time interval (tg - t0) is:

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 7

» Laws of Motion » Momentum

MCQ▾

### Question

A girl of 40 kg mass and a boy of 60 kg mass are moving with equal kinetic energies. What is the ratio of their momenta?

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 8

» Laws of Motion » Law of Conservation of Linear Momentum

MCQ▾

### Question

Two balls m1 and m2 are moving in the straight line, approaching each other as shown. After collision these objects stick together. What will be the velocity (in m/s) of the combined object after collision?

### Choices

Choice (4) Response

a.

3.75

b.

5.454

c.

6.523

d.

4.375

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