Rigid Rotations

In one revolution there are?

• I radian

• 2π radian

• 2 radian

• 4 radian

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

• same linear velocity and same  angular velocity

• same linear velocity and different angular velocity

• different linear velocities and same angular velocities

• different linear velocities and different angular velocities

Which of these quantities is not described by the kinematics of rotational motion?

• Rotation angle

• Angular acceleration

• Centripetal force

• Angular velocity

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

A construction worker is worried about applying too much torque to a bolt using his wrench. What could he do to reduce his torque on the bolt?

• Increase the length of the wrench

• Increase the force on wrench

• Reduce the length of the wrench

• Reduce the friction between the bolt and wrench

The easiest way to open a heavy door is by applying the force

• Near the hinges

• In the middle of the door.

• At the top of the door.

• At the edge of the door far from the hinges.

A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms,

• her moment of inertia increases and her angular speed decreases.

• her moment of inertia decreases and her angular speed increases.

• her moment of inertia increases and her angular speed increases.

• her moment of inertia increases and her angular speed remains the same.

The total angular momentum of a rotating body remains constant if the net torque acting on it is zero

• Frequency.

• Rotational kinetic energy.

• Rotational motion.

• Law of conservation of angular momentum.