ROTATIONAL MOTION

In pure translational motion, how do the velocities of different particles of the body compare?

• Velocities increase with distance from center
• Velocities are random
• Only the center moves
• All particles move with the same velocity at any instant

What is the nature of motion for a rigid body not fixed in space?

• It can only rotate
• It can only translate
• It vibrates in place
• It can have pure translation or a combination of translation and rotation

What determines the plane of motion for a particle in a rigid body rotating about a fixed axis?

• The plane is parallel to the axis
• The plane is at 45 degrees to the axis
• The plane is tangential to the axis
• The plane is perpendicular to the axis of rotation

What happens to the angular speed of a rotating system when its moment of inertia increases without external torque?

• Angular speed increases
• Angular speed remains unchanged
• Angular speed becomes zero
• Angular speed decreases

How does a diver use the principle of conservation of angular momentum during a dive?

• By increasing body mass
• By pushing against air
• By changing body shape to increase drag
• By tucking the body to reduce moment of inertia and increase rotation speed