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An introduction to a crowd-pleasing noisemaker called a sound sandwich, which you can adjust to raise or lower its pitch. A detailed demonstration of how to make this primitive wind instrument using little more than a straw, two craft sticks, and some rubber bands. The science behind this instrument, including a discussion of how vibration produces sound, and how long, massive objects vibrate slowly and produce a low-pitched sound, while shorter, less massive objects vibrate quickly and produce a high-pitched sound. An introduction to the stripped-down motor, a simple and easy-to-make version of the electric motors found in toys, tools, and appliances. A detailed description of the simple materials needed to make a stripped-down motor. A step-by-step demonstration of how to make the stand for the stripped-down motor. A step-by-step demonstration of how to make the coil for the stripped-down motor.
How the stripped-down motor works, including a discussion of how electricity and magnetism combine to drive the machine. Troubleshooting tips for making sure your stripped-down motor works well. A more detailed explanation of how the stripped-down motor works.