Pulley
Axle
Lever
Inclined plane
a sloping ramp up which heavy loads can be raised.
a rod or spindle (either fixed or rotating) passing through the centre of a wheel or group of wheels.
a rigid bar resting on a pivot, used to move a heavy or firmly fixed load with one end when pressure is applied to the other.
a wheel with a grooved rim around which a cord passes or which a rope runs and acts to change the direction of a force applied to the cord and is used to raise heavy weights.