ROTATIONAL MOTION

What is the contribution of a particle to the moment of inertia?

• m_i r_i
• m_i v_i
• m_i r_i²
• m_i ω

What is the primary reason l and ω may not be parallel for a particle?

• Because mass varies
• Because l depends on the position vector from origin
• Because velocity is tangential
• Because ω is scalar

How is the total external torque related to angular momentum change?

• τ = L t
• τ = dL/dt
• τ = I α
• τ = r F

What happens to L when dL/dt = 0?

• L increases
• L decreases
• L becomes zero
• L remains constant

What is the unit vector k̂ associated with in rotational motion?

• Center of mass
• Gravitational field
• Fixed axis of rotation
• Tangential direction