Physics
Figure shows a uniform metre rule of weight W supported on a fulcrum at the 60 cm mark by applying the effort E at the 90 cm mark.
(a) State with reasons whether the weight W of the rule is greater than, less than or equal to the effort E.
(b) Find the mechanical advantage in an ideal case.
Machines
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Answer
(a) The weight W of the scale is greater than E.
The effort arm is 30 cm and the load arm is 10 cm. In order to balance the scale — weight (W) of scale has to be more than effort (E).
(b) Given,
Load arm = 10 cm
Effort arm = 30 cm
As we know that,
Substituting the values in the formula we get,
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