dynamic force on crane when a load of 37k falls 1',2' 3'or 4'?
Need more information. In general, the answer is that the dynamic load depends on how quickly the payload decelerates. The dynamic load will be the mass of the payload times the peak deceleration rate. In a strength calculation, do not forget to include the static weight component of the load. The deceleration depends on the elasticity of the cables supporting the load. If the crane has a flexible supporting structure, then that could also affect the result. (You didn't say whether the crane is the traveling overhead hoist type usually seen in a factory - which typically has a stiff support - or the cantilevered truss type seen on construction sites - where the support might have a little flexibility.)
