Subscribe TechModgy to learn about new technologies!

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.)

A. P = W tan (α - φ)

B. P = W tan (α + φ)

C. P = W tan (φ - α)

D. P = W cos (α + φ)

Please do not use chat terms. Example: avoid using "grt" instead of "great".