ROTATIONAL MOTION

How does the concept of torque arise in rotational motion?

• As linear push
• As gravitational pull
• As frictional resistance
• As the rotational effect of a force

What is the direction of v = ω × r for counterclockwise rotation when viewed from above?

• Radially inward
• Downward
• Opposite to r
• Outward tangential (right-hand rule)

In the expression v = ω × r, what happens if r is parallel to ω?

• v doubles
• v becomes infinite
• v is maximum
• Linear velocity becomes zero

What is the magnitude of v = ω × r when r makes an angle θ with ω?

• ω r cosθ
• ω r tanθ
• ω r
• ω r sinθ

Which of the following best describes the vector ω × r?

• Parallel to ω
• Parallel to r
• A vector perpendicular to the plane containing ω and r
• Sum of ω and r