# Laws of Motion-Laws of Friction (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 10 - 12 of 33

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## Question number: 10

» Laws of Motion » Laws of Friction

MCQ▾

### Question

A block of mass 5 kg is placed on the floor. The coefficient of static friction is 0.2. 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.

25 N

b.

7.84 N

c.

2.5 N

d.

zero

## Question number: 11

» Laws of Motion » Laws of Friction

Assertion-Reason▾

### Assertion (Ꭺ)

A solid sphere and a hollow sphere of same mass M and same radius R are released from the top of a rough inclined plane. Friction coefficient is same for both the bodies. If both bodies perform imperfect rolling, then Work done by friction for the motion of bodies from top of incline to the bottom will be same for both the sides.

### Reason (Ꭱ)

Force of friction will be same for both the bodies.

### Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are false

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

## Question number: 12

» Laws of Motion » Laws of Friction

Assertion-Reason▾

### Assertion (Ꭺ)

Maximum value of friction force between two surfaces is u x normal reaction. Where u = coefficient of friction between surfaces.

### Reason (Ꭱ)

Friction force between surfaces of two bodies is always less than or equal to externally applied force.

### Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Ꭺ is false but Ꭱ is true

d.

Ꭺ is true but Ꭱ is false

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