Unit 9 was about waves. To find the velocity of a wave you need to multiply the wavelength by the frequency of the wave. The period of a wave = 1/frequency. We learned about what the parts of a wave were called: crest, (the top half of a wave), trough (the bottom half) and the nodes (the equilibrium point between waves). Amplitudes are the distance from the very top/bottom part of the crest/trough to the closest point on the equilibrium line thing.
Because the idea behind waves is usually energy opposed to a solid object, waves either add to each other or subtract each other for the split second that they pass depending on which way it was moving and how big it was before the collision before passing on.
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