The numerous wheel redistribute the massive pressure that a huge truck exerts onto a road. If a truck with 4 wheels is exerting a total pressure of lets say 8 Pascals that means that each wheel is ‘supporting’ 2 Pascals. If we increase the number of wheels to 8, each wheel will now support just 1 Pascal. This then implies that a heavier truck will require more wheels in order to reduce the pressure being applied onto the road.

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