All About Screws!By Ryan Kraus

A screw is a metal object like a nail. It has a spiral edge around it. It’s used to attach one thing to another.

Screws

The screw was invented in 700BC. Ancient Greece invented the Ancient screw

more then2,000 years ago. The first screw was a screw pump used for a

king’s garden in ancient Egypt. Screws are one of the few simple machines

that have exited since ancient times. With screws people can tighten and grip

things with much more force than they can by pushing or pulling!

InventionScrew

A propeller on a boat is a screw that cuts through water.

If a screw has few thread lines it will cut materials quickie and deeply.

There are serial deferent types of screws. The inclined plains are steep or on some.

Different Kinds

Real Life!!!!!!!