help on physics?

Question

an automotive technician applies a torque of 120 lb(ft) to tighten a cylinder head bolt. the bolt turns 1/8 of a revolution. how much work is done on the bolt?

Answer 1

Assume some convenient length for the torgue wrench (say 2 feet) then the applied force at the end of the wrench is 60 lbs. Now change things to metric (meters and Newtons), calculate the arc length traveled by the end of the wrench (in meters) and multiply that by the force in Newtons. That'll give you the amount of work expended (in Joules).


Doug