I do, however, enjoy the qualitative descriptions of how things work and come about working. Galileo's law of falling was nicely demonstrated by the ball falling a long distance. Proportions help better understand freefall. It is one of science's oldest question's, and it is the focus of this chapter. A wave is a disturbance that travels through a medium, and that transfers energy without transferring matter.
Projectile motion is an actual transfer of matter.
Wave motion is different from projectile motion. The wavelength of a continuous, repeated wave is the distance from any point along the wave to the next similar point, from crest to crest or from trough to trough. A wave's frequency is the number of vibrations that any particular part of the medium completes in each second. Waves are sent out by a vibrating source of some kind, in which case the wave's frequency must be the same as the source's frequency. The wave's amplitude refers to its width of vibration, the distance that each part moves back and forth during that part's vibrations.