Following a brief warm-up routine where students pretend to be a plant reacting to sunlight and water, students learn motions representing a period, question mark, and exclamation mark. As our narrators read ten sentences, students perform the motion that matches the appropriate end punctuation for each sentence.

Learn how to make waves of all different shapes by adding up sines or cosines. Make waves in space and time and measure their wavelengths and periods. See how changing the amplitudes of different harmonics changes the waves. Compare different mathematical expressions for your waves.

Play with one or two pendulums and discover how the period of a simple pendulum depends on the length of the string, the mass of the pendulum bob, and the amplitude of the swing. It's easy to measure the period using the photogate timer. You can vary friction and the strength of gravity. Use the pendulum to find the value of g on planet X. Notice the anharmonic behavior at large amplitude.