A. mg

B. mg – ma

**C. mg + ma**

D. mg – ma

# Circular Motion

## Who discovered the inverse square law for gravity ?

A. Einstein

B. Galileo

**C. Newtons**

D. Plank

## A body moving along the circumference of a circle completes two revolutions. If the radius of the circular path is R the ration of displacement to the covered path will be_____________?

A. πR

B. 2π R

**C. 0**

D. 4πR

## hen a body moves in a circle, the angle between its linear velocity and angular velocity is always_______________?

WA. 180°

B. 0°

**C. 90°**

D. 45°

## The span of the broad jump depends upon_______________?

A. Mass of the jumper

B. Height of jump

**C. Angle of projection**

D. None

## If a car moves with a uniform speed of 2 ms-1 in a circle of radius 0.4. Its angular speed is______________?

A. 4 rad. S-1

**B. 5 rad. S-1**

C. 1.6 rad. S-1

D. 2.8 ms-1

## A hoop and disc have same mass and radius. Their rotational K.E are related by an equation______________?

A. K.E hoop = K.E disc

**B. K.E hoop = 2K.E disc**

C. K.E hoop = 1/2K.E disc

D. K.E hoop = 4K.E disc

## A cyclist cycling around a circular racing track skids because_____________?

A. the centripetal force upon him is less than limiting friction

**B. the centripetal force upon him is greater than limiting friction**

C. the centripetal force upon him is equal to the limiting friction

D. the friction between the tyres of the cycle and road vanishes

## In an angular motion, Newton’s second law of motion is_____________?

A. F=ma

B. F=τp/It

**C. Στ = I α**

D. All above

## The angular speed for daily rotation of the earth in rad S-1 is______________?

A. 7.3 x 10 radians/second

B. 7.3 x 5 radians/second

C. 3.7 x 10 7.3 x 5 radians/second

**D. 7.3 x 10-5 radians/second**