for example, and the stapler on your desk. You use levers when you shift gears on a bike and when you hit the brakes. A doorknob is a type of lever. And then there's your body. Your body contains ...

Key fact When a lever is balanced it has equilibrium - the load is balanced on either side. A crowbar is an example of a first order lever that puts the load closer to the fulcrum - this gives it ...