When combining the elements sulfur and oxygen, molecules are created. these molecules consist of one sulfur atom and four oxygen atoms each.
use subscripts where needed in the chemical formula below to show this combination of elements.

see earlier

gas and liquid

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.