ROTATIONAL MOTION

Which principle explains the increased spin of a diver during a tuck?

• Conservation of energy
• Newton’s law of gravitation
• Conservation of linear momentum
• Conservation of angular momentum

What happens to kinetic energy when a person pulls their arms in while rotating?

• It decreases
• It remains constant
• It becomes zero
• It increases

What is the vector form of angular momentum for fixed-axis rotation?

• L = Lz k̂
• L = L⊥ k̂
• L = Lz k̂ + L⊥
• L = Iω

What is the effect of increasing moment of inertia on angular velocity when no torque acts?

• Angular velocity increases
• Angular velocity remains same
• Angular velocity becomes zero
• Angular velocity decreases

How is angular momentum conserved in absence of external torque?

• I remains constant
• ω remains constant
• Iω remains constant
• Kinetic energy remains constant