lever

A lever is a bar that helps move or change things by applying force at one end. It's often used with something else to get more power.

When you think of a lever, you probably picture a simple machine from school – a long, thin bar that you can push on one side and it will lift up the other side easily. But levers are everywhere in everyday life too. You might use a crowbar as a lever to pry open a stuck box or to move something heavy. Levers are also used in engineering and construction to lift massive weights or change the direction of forces. Even in sports, athletes use levers when they swing bats or golf clubs – it's all about applying force at one end to get the right result.