... The resistance the motor of a bridge or trolley drive has to overcome in producing motion along the track is that due to friction, inertia, wind effect and, in some instances, the resistance due ... 185.MƠÛ MÁY VÀ PHANH CƠ CẤU DI CHUYỂN (starting and stopping the traveling motion) Starting-The equation of moments at starting is given by-Mt : is the moment of resistance to crane or trolley ... resistance moment due to inertia consists of the moment due to inertia of gyrating masses of the mechanism.-M2 :the moment due to the inertia of the rectilinearly displacing masses of load and crane...