# Laws of Motion-Laws of Friction (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 18 - 24 of 33

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## 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.

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: 18 (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: 19 (3 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: 20

» Laws of Motion » Laws of Friction

MCQ▾

### Question

Block A weighs 4 N and block B weighs 8 N. The coefficient of kinetic friction is 0.25 for all surfaces. find the force F to slide B at a constant speed when A is held at rest.

### Choices

Choice (4) Response

a.

1N

b.

2N

c.

3N

d.

4N

## Question number: 21

» Laws of Motion » Laws of Friction

MCQ▾

### Question

Block A weighs 4 N and block B weighs 8 N. The coefficient of kinetic friction is 0.25 for all surfaces. find the force F to slide B at a constant speed when A and B are connected by a light cord passing over a smooth Pulley.

### Choices

Choice (4) Response

a.

2N

b.

5N

c.

3N

d.

1N

## Question number: 22

» Laws of Motion » Laws of Friction

MCQ▾

### Question

It is easier to pull a body than to push, because -

### Choices

Choice (4) Response

a.

the body does not move forward when pushed

b.

the coefficient of friction is more in pushing than that in pulling

c.

the friction force is more in pushing than that in pulling

d.

None of the above

## Question number: 23

» Laws of Motion » Laws of Friction

MCQ▾

### Question

A body of mass 600 g slides on a rough horizontal surface. If the frictional force is 8.0 N, the magnitude of the contact force is (g = 10 m/s 2)

### Choices

Choice (4) Response

a.

5.0 N

b.

4.0 N

c.

7.0 N

d.

3.0 N

## Question number: 24

» Laws of Motion » Laws of Friction

MCQ▾

### Question

A block is kept on a horizontal table. The table is undergoing simple harmonic motion of frequency 4 Hz in a horizontal plane. The coefficient of static friction between the block and the table surface is 0.70. Find the maximum amplitude of the table at which the block does not slip on the surface (g = 10 ms -2)

### Choices

Choice (4) Response

a.

0.04 m

b.

0.03 m

c.

0.011 m

d.

0.02 m

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