ROTATIONAL MOTION Quiz

• τ = τ_ext × τ_int
• τ = τ_ext − τ_int
• τ = τ_ext + τ_int
• τ = τ_int / τ_ext

• Internal forces are negligible
• Internal forces rotate the center of mass
• Internal forces are equal, opposite, and act along the line joining the particles
• Internal forces depend on velocity

• It only changes magnitude
• It only changes direction
• It has no effect
• It can change both magnitude and direction

• Due to gravity
• Due to friction
• Due to magnetic field
• Due to conservation of angular momentum

• L is lost
• L increases
• Total L remains unchanged if no external torque
• L becomes zero