Type your name:

How Levers Work

A lever is a(n) hammerresistance armsimplefirst-classSelect your answer machine. These machines make it easier to do multiplyworkfulcrumcastSelect your answer. The lever has a rigid bar that rests on a pivot point called the first-classfulcrumresistance armmechanical advantageSelect your answer. The side of the bar on which the lever produces an output force is called the resistance armdirectionfulcrumeffortSelect your answer. In a(n) resistance armcastfirst-classsimpleSelect your answer lever, the fulcrum lies between the effortsimplehammercastSelect your answer force and the output force. One example is a(n) hammercastfulcrumresistance armSelect your answer being used to pull a nail. Second-class levers do not change the effortworkdirectionfirst-classSelect your answer of the effort force. Third-class levers hammercastmultiplyeffortSelect your answer the distance of your effort. This allows fishers to hammermultiplycastworkSelect your answer a lure a long distance. A machine’s directionmechanical advantageresistance armfulcrumSelect your answer tells the number of times it increases our effort.