A fire tongs has its arms 20 cm long. It is used to lift a coal of weight 1.5 kgf as shown in the figure below by applying an effort at distance 15 cm from the fulcrum. Find the mechanical advantage of fire tongs.

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0.75

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0.25

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Solution

The correct option is B
0.75

Considering the above figure, we find that:

Point F acts as the fulcrum.
Effort is applied at point E. So, length of the effort arm = 15 cm
Load is at point L. So, length of the load arm = 20 cm

We know that,
Mechanical Advantage (MA) = $\frac{Effort arm}{Load arm}$

= $\frac{15}{20}$ = $\frac{3}{4}$ = 0.75

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