There are many physical phenomena that can be modelled by sine waves:

Waves in water are an obvious example,

Compression and ค่ายสล็อต 1688 rarefaction in the propagation of sound,

Transmission of all electromagnetic radiation,

Vibrations of strings in Musical Instruments,

Bodies "bouncing" on a spring.

Also, more complicated motion can be modelled by a superposition of many sine waves (using Fourier transforms). This enables complex motions to be studied more easily.