oars
A rope or chain with a wheel and axle attached.
wells
It changes the direction or size of a force
see-saws
slides
a circular object that revolves on an axle and is fixed below a vehicle or other object to enable it to move easily over the ground.
used in cars
One end is lower than the other end. This allows things to travel from the higher end to the lower end, or vice versa, with little effort.
cranes
It makes much easier to pull or push something over a long distance
used in skateboards
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
ramps
lifts
