all about screws haven
Post on 12-Nov-2014
352 Views
Preview:
DESCRIPTION
TRANSCRIPT
Haven Ribbens
Screws can be found all around you. They are used in furniture , drills, garage
doors, and some musical instruments. A screw is a inclined plane wrapped
around a circler cone into a spiral shape.
The screw is one of the oldest machines in the world .It was invented in Greece more then 2,000 years ago.
A screw with a longer Inclined Plane has more threads and a screw with a shorter inclined plane has fewer threads on it.
A bolt is a Screw. There are very sharp Screws. A nail is a screw too!
top related