Wave Motion (Encyclopedia of Science)
Wave motion is a disturbance that moves from place to place in some medium, carrying energy with it. Probably the most familiar example of wave motion is the action of water waves. A boat at rest on the ocean moves up and down as water waves pass beneath it. The waves appear to be moving toward the shore. But the water particles that make up the wave are actually moving in a vertical direction. The boat itself does not move toward the shore or, if it does, it's at a much slower rate than that of the water waves themselves.
The energy carried by a water wave is obvious to anyone who has watched a wave hit the shore. Even small waves have enough energy to move bits of sand. Much larger waves can, of course, tear apart the shore and wash away homes.
Types of wave motion
Two types of waves exist: transverse and longitudinal. A transverse wave is one that causes the particles of the surrounding medium to vibrate in a direction at right angles to the direction of the wave. A water wave is an example of a transverse wave. As water particles move up and down, the water wave itself appears to move to the right or left.
(The entire section is 924 words.)
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