Laws of Motion (KVPY Stream-SA (Class 11) Physics): Questions 5 - 8 of 20

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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:

A block sliding down an inclined plane

A Block Sliding Down an Inclined Plane

Figure shows a block of mass m is sliding down an inclined plane with constant speed.

Choices

Choice (4) Response
a.

mgh

b.

mgh

c.

μmghcosθ

d.

μmghsinθ

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.

2:3

b.

2:3

c.

3:2

d.

3:2

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?

 System consist of two balls

System Consist of Two Balls

In figure two balls approaching to each other. Mass m1 and m2 of the balls are 15 and 25 respectively. Velocity V1 and V2 of the balls are 20 m/s and 5 m/s respectively.

Choices

Choice (4) Response
a.

3.75

b.

5.454

c.

6.523

d.

4.375

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