Torque, Static Equilibrium, and Rotational Dynamics.

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  IN the case of rotational equilibrium, we can choose ANY point we like as the pivot point (since torque about all possible pivot points is zero!) So I'll choose the center of mass as the hypothetical pivot point.

• Moment of a force: Normal force on the wheels.

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• Physical Pendulum: Rotational Simple Harmonic Motion.

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