Browsing 440 - 450 results of 540 videos
The science behind the rocket and rocket launcher in the Bottle Blast Off activity, with troubleshooting tips for how to fine-tune the nose and fins of the rocket for better flight. Also includes tips on how to take the activity further by making a simple inclinometer to measure how far your rocket flies.
An introduction to the cuica (pronounced KWEE-kah), a small friction drum used in Brazil's Carnival parade. A detailed demonstration of how to make this small friction drum, including a discussion of materials needed and how different kinds of materials make for cuicas that produce different sounds. The science behind this musical instrument, including the concepts of sound, vibration, resonance, and amplification. 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.