Lever

The video tutorial introduces levers as simple machines that help lift or move loads. It explains the concept of a fulcrum and describes three classes of levers: first class, where the fulcrum is in the center; second class, with the fulcrum at one end; and third class, with the fulcrum at one end and effort applied in the middle. Examples for each class are provided, such as seesaws, scissors, bottle openers, staplers, baseball bats, and tweezers. The video concludes by encouraging viewers to think about how parts of their body function as levers.

Provide examples of first class, second class, and third class levers.

How do levers make it easier to lift or move objects?