Screw
A bar that has inclined plane wrapped around it
How screws help
The inclined plane lifts the soil,imagine a spiral stairway in a light house.The stairs go around ,just like the inclined plane on this auger.you start at the bottom and the stairway ,the inclined plane,lifts you upward.
this slide has inclined plane wrapped around it.
this gumball machine has inclined plane wrapped around it.
This is a picture of a screw.
This screw is is holding the block of wood together.