Angular Momentum 25/26

Define angular momentum

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A skater spins with arms stretched out. When she pulls her arms close to her body, she spins faster.

• conservation of moment inertia

• conversation of angular momentum

• conservation of angular momentum

• conservation of angular velocity

A disk of moment of inertia 2.0 kgm^2, rotates at 5.0 rad/s. If no external torque acts, what is its angular momentum?

• 10 kg m^2 s^2

• 10 kg m^2 s^-1

• 10 kg m^-1

• 20 kg m^2 s^-2

Angular momentum can be conserved even if external torque is acting.

• YES

• NO

If no external torque acts, what happens to angular momentum of a system?

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