Simple Machines. Essential Questions. What is the purpose of the simple machines?. Simple Machine Types. There are 6 basic kinds of simple machines. These are: Inclined Plane Wedge Screw Levers Wheel and Axle Pulley. Inclined Plane. An inclined plane is a flat, slanted surface.
Wheel and Axle
The knob is a wheel and the axle pulls in the closer so the door will open.
Both have inclined planes.
By changing the force, distance, or direction
Work is done when an object moves.