QUIZ 4 (TOPIC 5 & 6)

Which of the following is FALSE about uniform circular motion?

• The motion of an object in a circle moving at a constant velocity.
• As an object moves in a circle, it is constantly changing its direction.
• The linear velocity of an object is moving tangent to the circle.
• An object moving in a circle is accelerating.

The direction of centripetal acceleration always

• in the direction of object’s motion
• towards the centre of the circle
• towards outside of the circle
• tangent to the circle

What force is needed to keep an object moving in a circle?

• Centripetal force

• Weight

• Normal force

• Frictional force

The centripetal force will increase by

• decreasing the mass.

• increasing the velocity.

• decreasing the acceleration.

• increasing the radius.

When an object experiences uniform circular motion, the speed is

• zero.

• increasing with time.

• decreasing with time.

• constant.

Which of the following parameters remain constant for an object under uniform circular motion?

• Linear speed.
• Period
• Linear velocity
• Tangential acceleration

Angular velocity changes with time interval is called

• angular displacement
• average angular velocity
• average angular acceleration
• average angular speed

Revolution per minute is the unit of

• angular momentum

• angular acceleration

• angular displacement

• angular velocity

An ice skater is spinning with arms folded inwards. Later the ice skater stretches his arms outwards. Which of the following is constant?

• Angular displacement
• Moment of inertia
• Angular momentum
• Angular velocity

The moment of inertia of a body NOT depends on

• the mass of the body.
• the angular velocity of the body.
• the axis of rotation of the body.
• the distribution of the mass of the body.