Lever+Inclined Plane+Pulley

Although simple machines vary in size and form, all of them can be placed into one of three categories: levers, inclined planes, or pulleys.

The lever consists of a body of rigid material along which effort is transferred to the load.
Principle: Moving the fulcrum closer to the load increases the lever’s mechanical advantage; moving the fulcrum closer to the effort decreases this advantage.

An inclined plane is a sloped road, built to navigate the height difference b/t the bottom and the top of a hill.
Principle:There is an inverse relationship b/t the effort required to raise a load using an inclined plane, and the distance along the plane that must be traveled to raise the load the desired height.

An ordinary pulley consists of a grooved wheel and a rope passing over it, and serves only to change the direction of force.
Principle:To lift the flag to the top of the flagpole, the rope is passed over the pulley at the top of the pole and one end is attached to the flag. When downward effort is applied to the other end of the rope, the flag is pulled upward.