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First, letâs define each of these terms: 1  Push System: is a system in which we produce goods based on our best projections of what the market wants. 2  Pull System: is a system in which the production of goods is initiated by the person or organization who consumes that good.
A pully is simply a circular lever. The same amount of work is required, but you exchange one unit for another. To lift 10 pounds one foot requires 10 foot-pounds of energy. Using a pulley system, you may only have to lift the apparent weight of 1 pound, but you'd have to pull 10 times more rope.