Machines use our physics discoveries to make work easy for us!
Work has two parts - the force applied and the distance it is applied over. By making us apply a small force over a large distance a machine can make required less effort (the force we put in).
We always put in more work than we get out of a machine - no machine is 100% efficient but you would never know that when you see how easy they make a job!
Click here to go to the page on the lever
Click here to go to the page on the inclined plane
Below we have links to Bill Nye the Science Guy's take on machines - watch and enjoy!