ROTATIONAL MOTION

How does a classical dancer control spin speed during a pirouette?

• By pushing the floor repeatedly
• By changing mass
• By using air currents
• By adjusting moment of inertia through body posture

What assumption about internal forces ensures net internal torque is zero?

• Forces are perpendicular to the line
• Forces increase with distance
• Forces are negligible
• Forces act along the line joining the particles

In the equation v = ω × r, what is the direction of the linear velocity vector?

• Parallel to ω
• Parallel to r
• At 45 degrees to both
• Perpendicular to both ω and r

What is the significance of the right-hand rule in rotational physics?

• It measures force magnitude
• It calculates speed
• It balances forces
• It determines the direction of axial vectors like angular velocity and torque

How does linear velocity of a rotating particle depend on its distance from the axis?

• Inversely proportional
• Independent of distance
• Randomly varying
• Directly proportional to the distance