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For the purpose of calculating the counterweight's mass, no need to figure out the force in Newtons. Mass ratio is inverse of distance ratio.Al_Pa_Cone said:View attachment 233888
View attachment 233889
I have redrawn the diagram to show the idea. I have started with working out the net weight of the lid as a UDL and worked out 1000g into Newtons = 9.81N. as a UDL this would be 9.81/0.6m = 16.35N.