QUIZ 6&7 SET 2

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

• Weight

• Normal force

• Centripetal force

• Frictional force

A particle moving with constant speed in a circular path accelerates. Which of the following is/are correct?

I. Velocity is a vector quantity.

II. The direction of velocity changes.

III. Acceleration is the rate of change in velocity.

• I, II, III,

• I, II

• II, III

• III

"Angle undergoes from a fixed reference line" this statement refer to

• Instantaneous angular velocity

• angular acceleration

• Average angular velocity

• Angular displacement

Torque is define as cross product between distance, r and __________

• force

• energy

• velocity

• displacement

In a rotational motion of rigid body, all particles move with

• same linear velocity and different angular velocity

• different linear velocities and same angular velocities

• same linear velocity and same angular velocity

• different linear velocities and different angular velocities

As the angular velocity of an object increases, what happens to the linear velocity of a point on that object?

• It increases, because linear velocity is directly proportional to angular velocity.

• It increases, because linear velocity is inversely proportional to angular velocity.

• It decreases because linear velocity is directly proportional to angular velocity.

• It decreases because linear velocity is inversely proportional to angular velocity.

What kind of quantity is torque?

• Scalar

• Dimensionless

• Fundamental quantity

• Vector

If a linear force is applied to a lever arm farther away from the pivot point, what happens to the resultant torque?

• It decreases.

• It remains the same.

• It increases.

• It changes the direction.