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In your drawing, you state that the truck will lose traction the farther it pulls without a lower pulley. Actually it seems that all things being equal, the farther the truck is from upper pulley and the more the angle is decreased, the more traction the truck would have, especially if pulling...

PC you got me curious about the zip line or speed line thing. I understand what the gentleman in the vid was saying about suspended loads, but what about a rolling load going downhill? My brain wants to tell me that since it's moving, and obeying the law of gravity, that the tension on the speed...