ROTATIONAL MOTION

How is the total linear momentum of a system of particles related to the center of mass?

• It is zero always
• It depends on internal forces
• It is independent of center of mass
• It equals total mass times velocity of center of mass

What is the main reason for using the rigid body model in physics?

• To make objects heavier
• To increase complexity
• To allow bending
• To simplify analysis by ignoring deformations

How does the center of mass affect the balance of a body?

• It must be at the center
• It must be high
• It has no effect
• A body balances when the center of mass is directly above the base of support

What determines the stability of a rotating object?

• Its color
• Its temperature
• Its linear speed
• Its moment of inertia and angular momentum

What is the angular momentum of a rigid body rotating about a fixed axis?

• L = mv
• L = Iα
• L = τt
• L = Iω