ROTATIONAL MOTION

Which conservation law applies when no external torque acts?

• Conservation of energy
• Conservation of linear momentum
• Conservation of angular momentum
• Conservation of mass

A body rotates with constant angular velocity. Is work being done?

• No work is done
• Work is negative
• Yes, if torque is applied against friction
• Work depends on radius

Power in rotational motion is given by which formula?

• P = Fv
• P = τ/ω
• P = τω
• P = Iω²

A torque of 10 N·m is applied to a body with moment of inertia 2 kg·m². What is angular acceleration?

• 0.2 rad/s²
• 2 rad/s²
• 5 rad/s²
• 20 rad/s²

If moment of inertia of a rotating body is halved with no external torque, what happens to kinetic energy?

• Halves
• Remains same
• Doubles
• Quadruples