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Question

A fire tongs has its arms $$20 \ cm$$ long. It is used to lift a coal of weight $$1.5 \ kgf$$ by applying an effort at a distance $$15 \ cm$$ from the fulcrum. Find the effort needed.


A
0.2kgf
loader
B
1.5kgf
loader
C
2.5kgf
loader
D
2.0kgf
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Solution

The correct option is C $$2.0 kgf$$
$$Load= 1.5kgf$$
$$Load \ arm= 20cm$$
$$Effort \ arm=15 cm$$
$$Effort \ = 20 \times 1.5/15= 2.0kgf$$
The fulcrum in tongs is the joint end of the arms

Physics

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