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
B
1.5kgf
C
2.5kgf
D
2.0kgf

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 armsPhysics

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