ROTATIONAL MOTION

Which figure shows the vector form of linear velocity as v = ω × r?

• Fig. 6.16
• Fig. 6.17(a)
• Fig. 6.17(b)
• None of the figures

What is the significance of choosing the origin on the axis of rotation when defining position vector r?

• Makes r parallel to ω
• Reduces r to zero
• Ensures r has a component perpendicular to ω
• Makes ω zero

How does the linear velocity of particles vary with their distance from the axis in a rotating rigid body?

• Decreases with distance
• Remains constant
• Increases quadratically
• Increases linearly with distance

What is the linear velocity of a particle located exactly on the axis of rotation?

• Equal to ω
• Infinite
• v = ωr where r is maximum
• Zero

If a particle is at distance r from the axis, what determines its linear speed?

• Only angular velocity
• Only radius
• Angular velocity and r
• Time period only