what is fulcrum ? what is load arm ? what is effort arm ?
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A lever is a rigid bar with three parts: the fixed point around which the bar pivots is the fulcrum; the effort arm (in-lever arm) is the part of the lever to which force is applied; the resistance arm (out-lever arm) is the part that bears the load to be moved.
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the point against which a lever is placed to get a purchase, or on which it turns or is support
for both answers see pic.
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