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

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

1.	In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)
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» C. P = W tan(φ - α)

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

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