Calculate the force required to lift a load of 60N, placed at a distance of 3m from the fulcrum, if the effort is applied at a distance of 6cm from the fulcrum.
A
300N
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B
3000N
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C
1500N
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D
30N
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Solution
The correct option is B3000N
F1=60N,l1=3m,l2=6cm,F2=? Left hand side moment, about fulcrum =60×3=180Nm. Right hand side moment about fulcrum =F2×6×10−2Nm. According to principle of moment, L.H.M=R.H.M ⇒180=F2×6×10−2 ⇒F2=1806×10−2=3000N Therefore, a force of 3000N is required to lift the load.