8.1 A mechanic is working on an engine and needs to tighten a bolt onto the engi

Question

8.1 A mechanic is working on an engine and needs to tighten a bolt onto the engine block by using a wrench. Assume a typical threading.

a. Identify the lever arm in this scenario.

b. How should the mechanic apply his/her force in order to maximize torque? That is, at what angle to the elver arm will his/her force provide the most torque?

c. In what direction is the torque applied? Use Cartesian xyz coordinates, in which the bolt is in the x-y plane and positive z is the direction toward space.

d. What is the unit of torque ?

Explanation / Answer

a) Lever arm is the distance between axis of rotation of the point on the wrench to which mechanic apply the force.

b) He should apply force perpendicular to the lever arm of wrench.

c) Torque is produced along - z axis.

d) SI units of torque is Newton-metre. (Nm)

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