Two mechanics, A and B, are attempting to turn a two-person spanner (wrench) to loosen a nut on a large wheel. Fig. 2.1 shows the forces applied by the two mechanics. Mechanic A applies a force of 500 N at a distance of 1.2 m from nut P. Mechanic B applies a force of 400 N at a distance of 1.2 m on the opposite side of nut P.
(a)[4]
Calculate the magnitude and the direction of the resultant moment produced by the mechanics about nut P.
(b(i))[1]
Calculate the magnitude of the new resultant moment produced by the mechanics.
(b(ii))[1]
Calculate the magnitude of the resultant force now acting on the spanner from the mechanics.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Moment = F \times x⊥, e.g. 400 \times 1.2 or 500 \times 1.2 or 480 or 600” …