# Laws of Motion-Laws of Friction (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 1 - 4 of 33

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## Question number: 1

» Laws of Motion » Laws of Friction

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MCQ▾

### Question

The contact force exerted by a body A on another body B is equal to the normal force between the bodies. We conclude that -

(1) The surfaces must be smooth

(2) Force of friction between two bodies may be equal to zero

(3) Magnitude of normal reaction is equal to that of friction

(4) Bodies may be rough

Which of the following options are correct?

### Choices

Choice (4) Response

a.

3 and 4

b.

1 and 2

c.

1 and 4

d.

2 and 4

## Question number: 2

» Laws of Motion » Laws of Friction

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MCQ▾

### Question

A body of mass 400 g slides on a rough horizontal surface. If the frictional force is 3.0 N, the angle made by the contact force on the body with the vertical will be

### Choices

Choice (4) Response

a.

53°

b.

37°

c.

27°

d.

63°

## Question number: 3

» Laws of Motion » Laws of Friction

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MCQ▾

### Question

A block of mass 2 kg is placed on the floor. The coefficient of static friction is 0.4. A force F of 2.5 N is applied on the block, as shown. Calculate the force of friction between the block and the floor, (g = 9.8 ms -2)

### Choices

Choice (4) Response

a.

2.5 N

b.

zero

c.

25 N

d.

7.84 N

## Question number: 4

» Laws of Motion » Laws of Friction

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MCQ▾

### Question

A block is kept on a horizontal table. The table is undergoing simple harmonic motion of frequency 3 Hz in a horizontal plane. The coefficient of static friction between the block and the table surface is 0.72. 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.

0.02 m

b.

0.03 m

c.

0.01 m

d.

0.04 m

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