ROTATIONAL MOTION

What is the condition for a body to be in rotational equilibrium?

• Net force is zero
• Only gravity acts
• No forces present
• Net torque about any axis is zero

How is torque maximized when applying a force to a wrench?

• By pushing near the bolt
• By pulling parallel to the handle
• By using a shorter wrench
• By applying the force perpendicular to the handle at the far end

What happens to the total momentum of a system when only internal forces act?

• It increases
• It decreases
• It oscillates
• It remains constant

What determines the direction of angular momentum vector for a rotating body?

• Direction of linear velocity
• Direction of force
• Direction of torque
• The direction of angular velocity vector

How does a ballet dancer control rotational speed during a spin?

• By pushing against air
• By changing mass
• By using magnetic fields
• By changing moment of inertia through body posture