# Rotational Motion-Moment of a Force (NEET Physics): Questions 4 - 6 of 6

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## Question number: 4

» Rotational Motion » Moment of a Force

MCQ▾

### Question

A flywheel of mass 25 kg has a radius of 0.3 m. What force should be applied tangentially to the rim of the flywheel so that it acquires an angular acceleration of 4 rad s -2?

### Choices

Choice (4) Response
a.

6.8 N

b.

11.2 N

c.

7.5 N

d.

2.6 N

## Question number: 5

» Rotational Motion » Moment of a Force

Assertion-Reason▾

### Assertion (Ꭺ)

The force of fiction in the case of a disc rolling without slipping down an inclined plane is .

### Reason (Ꭱ)

When the disc rolls without slipping, friction is required because for rolling condition velocity of point of contact is zero.

### Choices

Choice (4) Response
a. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ
b. Both Ꭺ and Ꭱ are false
c. Ꭺ is true but Ꭱ is false
d. Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

## Question number: 6

» Rotational Motion » Moment of a Force

MCQ▾

### Question

A particle of mass m is moving in a plane along a circle of radius r. Its angular momentum about the axis of rotation is L. What is the centripetal force acting on the particle?

### Choices

Choice (4) Response
a.

b.

c.

d.