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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.

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. State with reasons whether the weight W of the rule is greater than, less than or equal to the effort E. Find the mechanical advantage in an ideal case. Machines, Concise Physics Class 10 Solutions.

(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.

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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,

M.A.=Effort armLoad armM.A. = \dfrac{\text{Effort arm}}{\text{Load arm}} \\[0.5em]

Substituting the values in the formula we get,

M.A.=3010M.A.=3M.A. = \dfrac{\text{30}}{\text{10}} \\[0.5em] \Rightarrow M.A. = 3

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