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Question

Calculate the force required to lift a load of 60 N, placed at a distance of 3 m from the fulcrum, if the effort is applied at a distance of 6 cm from the fulcrum.


A
300 N
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B
3000 N
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C
1500 N
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D
30 N
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Solution

The correct option is B 3000 N


F1=60 N,l1=3 m,l2=6 cm,F2=?
Left hand side moment, about fulcrum
=60×3=180 Nm.
Right hand side moment about fulcrum =F2×6×102 Nm.
According to principle of moment,
L.H.M=R.H.M
180=F2×6×102
F2=1806×102=3000 N
Therefore, a force of 3000 N is required to lift the load.

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