Laws of Motion (NEET Physics): Questions 84 - 88 of 114

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Question number: 84

» Laws of Motion » Laws of Friction

MCQ▾

Question

Find the maximum value of M/m in the situation shown in figure so that the system remains at rest. Friction coefficient at both the contacts is u.

Find the maximum value of M/m

Find the Maximum Value of M/m

System is at rest and friction coefficient at both the contacts is u

Choices

Choice (4) Response
a.

μsinθμcosθ

b.

μcosθμsinθ

c.

μsinθ+μcosθ

d.

2μsinθμcosθ

Passage

Read the passage given below and answer the questions that follows: A block of mass 1 kg is placed on a rough horizontal surface. A spring is attached to the block whose other end is joined to a rigid wall, as shown in the figure. A horizontal force is applied on the block so that it remains at rest while the spring is elongated by x.

xμmgk

Let F max and F min be the maximum and minimum values of force F for which the block remains a equilibrium. For a particular x,

F max - F min = 2N

Also shown is the variation of F max + F min versus x, the elongation of the spring.

Question number: 85 (1 of 3 Based on Passage) Show Passage

» Laws of Motion » Laws of Friction

MCQ▾

Question

The value of F, if x = 3 cm. is -

Choices

Choice (4) Response
a.

0.2 N

b.

0

c.

1N

d.

5N

Question number: 86 (2 of 3 Based on Passage) Show Passage

» Laws of Motion » Laws of Friction

MCQ▾

Question

The spring constant of the spring is -

Choices

Choice (4) Response
a.

50 N/m

b.

2.5 N/m

c.

20 N/m

d.

25 N/m

Question number: 87 (3 of 3 Based on Passage) Show Passage

» Laws of Motion » Laws of Friction

MCQ▾

Question

The coefficient of friction between the block and the horizontal surface is -

Choices

Choice (4) Response
a.

0.1

b.

0.3

c.

0.2

d.

0.4

Question number: 88

» Laws of Motion » Static and Kinetic Friction

MCQ▾

Question

A block is placed on a rough floor and a horizontal force F is applied on it. The force of friction f by the floor on the block is measured for different values of F and a graph is plotted between them –

(1) The graph is a straight line of slope 45°

(2) The graph is straight line parallel to the F axis

(3) The graph is a straight line of slope 45° for small F and a straight line parallel to the F-axis for large F.

(4) There is small kink on the graph

Which of the following options are correct?

Choices

Choice (4) Response
a.

1 and 4

b.

1 and 2

c.

3 and 4

d.

1 and 3

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