Laws of Motion (KVPY Stream-SA (Class 11) Physics): Questions 1 - 2 of 20

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Question number: 1

» Laws of Motion » Equilibrium of Concurrent Forces

Appeared in Year: 2011

MCQ▾

Question

A small child tries to moves a large rubber toy placed on the ground. The toy does not move but gets deformed under her pushing force (F) which is obliquely upward as shown. Then,

A large rubber toy is pushed by a child

A Large Rubber Toy Is Pushed by a Child

Figure shows a small child tries to moves a large rubber toy placed on the ground.

Choices

Choice (4) Response
a.

The normal force by the ground is equal and opposite to the weight of the toy

b.

The resultant of the pushing force (F) , weight of the toy, normal force by the ground on the toy and the frictional force is zero.

c.

The pushing force (F) of the child is balanced by the equal and opposite frictional force

d.

The pushing force (F) of the child is balanced by the total internal force in the toy generated due to deformation.

Question number: 2

» 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.

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