torque wrench nm
With what force must you pull? If...?
The tune-up specifications of a car call for the spark plugs to be tightened to a torque of 34 Nm. You plan to tighten the plugs by pulling on the end of a 22-cm-long wrench. Because of the cramped space under the hood, you'll need to pull at an angle of 120 degrees with respect to the wrench shaft.
120º is 60º measured from the other side.
If F is the force, then F sin 60 is the amount perpendicular to the lever.
You need 34 Nm and that has to equal (Fsin60)(0.22)
(Fsin60)(0.22) = 34
0.191F = 34
F = 178 Newtons
.
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