ROTATIONAL MOTION Quiz

• Friction decreases with body size
• Air resistance becomes negligible
• Muscular force increases angular speed
• Moment of inertia decreases, increasing angular speed to conserve angular momentum

• Conservation of energy
• Newton's third law
• Linear momentum conservation
• Conservation of angular momentum

• It gradually decreases
• It increases
• It changes direction randomly
• It remains constant

• Internal forces are too weak to create torque
• Internal forces act at the center of mass
• Internal forces do not produce any motion
• Internal forces act along the line joining the particles and their torques cancel out

• τ = Σ (r_i · F_i)
• τ = Σ (F_i × r_i)
• τ = Σ (r_i + F_i)
• τ = Σ (r_i × F_i)