ROTATIONAL MOTION

How can pure rotation of a rigid body about a fixed axis be characterized?

• All parts have the same linear velocity
• All parts have zero acceleration
• All parts move in straight lines
• All parts have the same angular velocity at any instant

What is true about the angular velocity of all particles in a rigid body rotating about a fixed axis?

• It increases with distance from the axis
• It decreases with distance from the axis
• It is zero for all
• It is the same for all particles

Why are particles on the axis of rotation stationary?

• Because they have infinite mass
• Because external forces stop them
• Because their angular velocity is zero
• Because their distance from the axis is zero

For a particle at perpendicular distance ri from the axis of rotation, what is its linear velocity vi?

• vi = ω/ri
• vi = ri/ω
• vi = ω²ri
• vi = ωri

What is the relationship between linear velocity v and angular velocity ω for a particle in circular motion?

• v = ω/r
• v = r/ω
• v = ω²r
• v = ωr