Laws of Motion-Static and Kinetic Friction (KVPY Stream-SA (Class 11) Physics): Questions 1 - 2 of 5

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Question number: 1

» Laws of Motion » Static and Kinetic Friction

Appeared in Year: 2010

MCQ▾

Question

A block of mass M rests on a rough horizontal table. A steadily increasing horizontal force is applied such that the block starts to slide on the table without toppling. The force is contained even after sliding has started. Assume the coefficients of static end kinetic friction between the table and block to be equal. The correct representation of the variation of the frictional force f’ exerted by the table on the block with time t is given by,

Choices

Choice (4) Response

a.

Graph of friction force f’ ⟶ time t (Choice A)

Graph of Friction Force F’ ⟶ Time T (Choice A)

Figure shows the representation of the variation of the frictional force f’ exerted by the table on the block with time t.

b.

Graph of friction force f’ ⟶ time t (Choice B)

Graph of Friction Force F’ ⟶ Time T (Choice B)

Figure shows the representation of the variation of the frictional force f’ exerted by the table on the block with time t.

c.

Graph of friction force f’ ⟶ time t (Choice C)

Graph of Friction Force F’ ⟶ Time T (Choice C)

Figure shows the representation of the variation of the frictional force f’ exerted by the table on the block with time t.

d.

Graph of friction force f’ ⟶ time t (Choice D)

Graph of Friction Force F’ ⟶ Time T (Choice D)

Figure shows the representation of the variation of the frictional force f’ exerted by the table on the block with time t.

Question number: 2

» 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

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