Convert torque between newton-metres, kilonewton-metres, kilogram-force metres, pound-force feet and pound-force inches.
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10 lbf·ft = 10 × 1.35582 ÷ 1 = 13.5582 N·m.
A force F = 50 N is applied at r = 0.3 m from a pivot, perpendicular to the lever (θ = 90°).
τ = rF sinθ = 0.3 × 50 × 1 = 15 N·m
Quoted from Torque and Angular Momentum — The Calculations.
A force F = 40 N is applied at the end of a 0.5 m wrench, at 60° to the wrench's length.
τ = rF sinθ = 0.5 × 40 × sin60°
0.5 × 40 = 20, and sin60° = 0.8660, so τ = 20 × 0.8660 = 17.3 N·m
Applying the same 40 N force perpendicular to the wrench instead would give 0.5 × 40 = 20 N·m — noticeably more torque for the same effort, which is why mechanics always tell you to pull a spanner perpendicular to its handle.
Quoted from Torque and Angular Momentum — The Calculations.
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