ROTATIONAL MOTION

What is the expression for torque on a system of particles about the origin?

• τ = Σ (rᵢ · Fᵢ)
• τ = Σ (Fᵢ × rᵢ)
• τ = Σ (rᵢ + Fᵢ)
• τ = Σ (rᵢ × Fᵢ)

How is the angular momentum of a system of particles about the origin defined?

• L = Σ (rᵢ · pᵢ)
• L = Σ (pᵢ × rᵢ)
• L = Σ (rᵢ + pᵢ)
• L = Σ (rᵢ × pᵢ)

What happens to the total linear momentum of a system when net external force is zero?

• It increases continuously
• It decreases to zero
• It changes direction randomly
• It remains constant

What is the relationship between center of mass velocity and total linear momentum?

• V = P × M
• V = M/P
• V = P²/M
• V = P/M

How is the center of mass of a system of particles defined?

• The geometric center regardless of mass
• The heaviest particle's location
• The midpoint between two extreme particles
• As the point whose position vector is the mass-weighted average of individual position vectors