Hertz

Hertz is a word that describes how fast something is moving back and forth. Think of when you ride a swing set and you go back and forth. Your body is moving at a certain speed in cycles per second. That is like the swings' frequency which is measured in hertz. Hertz is also used to describe how often things like radio waves or sound waves move back and forth per second. It's like counting how many times you jump on a trampoline in a minute. The number you get is the hertz frequency of your movement. So, hertz helps us understand how fast or slow things are moving back and forth.