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45_resonance

# 45_resonance - Lesson 45 Resonance If we look at examples...

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Lesson 45: Resonance If we look at examples of SHM we may find that we can come up with some interesting effects. Imagine pushing a child on a swing. How do you make her go higher? Well, you make sure that you time your pushes so that you push in sync with the way she is already swinging. If you push randomly (out of sync), then the child will never go very high. This causes the simple harmonic motion of the child to have an increasing amplitude. We give this kind of "in sync" motion the special name " resonance ." Resonant Frequency & Forced Frequency From the last lesson you learned that the only thing that changes the period of a pendulum is its length. Even if we change other things, like the mass on the end of the pendulum, the period will stay the same. Every pendulum that has the same length has the same period, and also the same frequency. This particular frequency is the natural frequency that the pendulum will always swing at.

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45_resonance - Lesson 45 Resonance If we look at examples...

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