E_QUEST1 How do the bones of your arm act as levers?
E_QUEST2 How do nail clippers work?
E_QUEST3 How do the keys on a piano act as levers?
D_TEXTBLOCK_TEXT A lever is a simple <HL Topic=Machine.tpc>MACHINE</HL> that consists of a rigid bar that rests on a fixed point called the <HL Topic=Fulcrum.tpc>FULCRUM</HL>. The <HL Topic=Force.tpc>FORCE</HL> exerted on a lever is called the <HL Topic=Effort.tpc>EFFORT</HL>, and the <HL Topic=Force.tpc>FORCE</HL> the lever exerts is called the <HL Topic=Resistance.tpc>RESISTANCE</HL>. There are three classes of levers. The position of the <HL Topic=Fulcrum.tpc>FULCRUM</HL> in relation to the <HL Topic=Effort.tpc>EFFORT</HL> and <HL Topic=Resistance.tpc>RESISTANCE</HL> is different for each kind of lever.