Question

 Levers are machines. Differentiate between three classes of levers. Provide appropriate examples

Answer 1

• First class lever – the fulcrum is in the middle of the effort and the load example of it is a crowbar.
• Second class lever – the load is in the middle between the fulcrum and the effort, the effort arm is always longer than the load arm, an example is a bottle opener.
• Third class lever – the effort is in the middle between the fulcrum and the load, the effort arm is smaller than the load arm, an example is forearms for lifting loads.