ROTATIONAL MOTION

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

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

Why is the cross product used to define torque and angular momentum?

• To make calculations complex
• Because they are scalar quantities
• To eliminate direction information
• Because these quantities involve perpendicular components and directional properties

What happens to the moment of inertia of a person on a spinning chair when they bring their arms closer?

• It increases
• It remains the same
• It becomes infinite
• It decreases

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

• It decreases with distance
• It is independent of distance
• It varies randomly
• It increases linearly with distance from the axis

What is the condition for conservation of angular momentum in a system of particles?

• Net external force is zero
• Only gravity acts
• All particles are at rest
• Net external torque is zero