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a fulcrum is the part which balences it and the bar, put it on top of the fulcrum

Force & Weight are the two parts needed to make a lever.

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What to parts are needed to make a lever?

a fulcrum is the part which balences it and the bar, put it on top of the fulcrum Force & Weight are the two parts needed to make a lever.


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When calculating the mechanical advantage of a lever what two pieces of information are needed?

You need to know the length of the lever and the location of the fulcrum along that length. The ratio of the lengths on either side of the fulcrum will determine the ratio of forces at either end. The length of the lever will dictate the total force possible. For a lever of length L divided into lengths a and (L - a) by the fulcrum (where a is the length of the lever between the fulcrum and the object you want to apply force to), the mechanical advantage will beM.A = (L-a)/aThe longer the lever, the bigger you can make the numerator of that fraction while keeping a unchanged.