A screw is just an inclined plane wrapped around a post
This resource helps demonstrate their uses
The large block mounted around the head of the screw gives students additional leverage so they can easily break eggs or squish other objects with the screw that would be difficult to break with their bare hands
The square top also makes it easy to measure the distance top of the screw is turned versus the distance the screw is sent into the board
Includes an instruction manual to facilitate students and teacher use of the apparatus
