Question

1. describe an action that shows two forces you used as you got ready for school today

were you using a push or pull in each interaction

what was the effort force

what was the resistance force

2. name an object found on a playground that uses simple machine to make it work, what kind of simple machine is used? How would the playground be different if there were no simple machines there?

Answer 1

Blowing a whistle forces air through the mouthpiece's rectangular tube until it runs into a slotted edge. The slot divides the air in two, creating oscillating sound waves that then tumble around the resonate chamber, or barrel. As the compressed air escapes from the hole on the other end, it creates an audible pitch. The pitch frequency is determined by length -- longer whistles produce lower pitches and shorter whistles produce higher pitches. Some whistles have a ball inside the chamber, often made of cork or synthetic cork, that bounces around, further disturbing the molecules to create a trilling effect. Steam whistles use steam to propel the air, which can make them quite loud.