In a screw jack, the effort required to lift the load is given by(where W = Load

Question

In a screw jack, the effort required to lift the load is given by(where W = Load lifted, α = Helix angle, and φ = Angle of friction.)

Options:

A . P = W tan (α - φ)

B . P = W tan (α + φ)

C . P = W tan (φ - α)

D . P = W cos (α + φ)

Answer: Option B
Answer: (b).P = W tan (α + φ)

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