What is a lever?
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A lever is a simple machine which in its simplest form is made up of a rod which can turn about a fixed point called the fulcrum.
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Can a machine have an efficiency of 100% ? Give a reason to support your answer.
'A machine is 75% efficient'. What do you understand by this statement?
What do you mean by the mechanical advantage of a lever ?
Which class of lever has the mechanical advantage always more than 1 ? Give an example.