823 Fortune Sticks

The NO stick has a much lower natural frequency than the YES sticks.

When the base is moved to-and-fro subtlely but periodically, both sticks experience a periodic driving force.

When the base is shaken at the natural frequency of the NO stick, energy is transfered efficiently to the NO stick. The NO stick goes into resonance and attain a large amplitude of oscillation. The YES stick, being very quick, easily moves in line with the base and attains negligible amplitude of oscilation.

When the base is shaken at the natural frequency of the YES stick, the YES stick goes into resonance and attain a large amplitude of oscillation. The NO stick is too slow to react to the rapidly changing driving force, and remains motionless.

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