By Caitlyn Mcnatt
Lever - Oil Pumpjack
The machine uses a lever to pull oil out of the ground. It works by a motor that rotates a arm attached to one end of a lever. As the arm rotates, it moves the lever up and down. Attached to the other end of the lever is a piston that pulls the oil out of the ground.
A inclined plane works by increasing a distance to lower the force needed to push something up. when pushing something up a steeper shorter ramp the more force is needed. The longer the ramp the less force is needed.
Pulley-garage door opener
A pulley works by changing the direction of your lifting force. The more pulleys you have the less force is needed. A pulley system is a rope with more than 1 pulley. this is a single fixed pulley.
A screw is a inclined plane raped around a cylinder. It is used to fasten to objects together A screw driver is used to do so.