They can all be used to model waves! Room 209 is studying waves in preparation for learning about sound and light. Using a slinky, we modeled longitudinal waves and looked for compressions and rarefactions. With ropes, we learned about transverse waves, noting the crests and troughs, and experimenting to change the amplitude, frequency, wavelength and speed of our waves.
Later, we rolled tennis balls across paper, watching them bounce off the wall. By wetting them first, we were able to track their path going to and from the wall. From this we determined that the angle of incidence and angle of reflection were equal! Now that we know what happens when waves come into contact with a smooth, solid surface, we can't wait to find out when they encounter other surfaces and even other waves. We will continue to work on our unit on waves and then apply what we've learned to sound and light.
For a model of constructive and destructive interference, check out the applet here: PHSchool Interference
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