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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.
For a pulley or system of pulleys, the force against which one is working is called the load force.. The force input to do the work of moving the load is called the effort force.. The ratio of the load force to the effort force (#F/S#) is called the mechanical advantage. In an ideal system the mechanical advantage will be the ratio of the number of meters of rope that you need to pull past your hands in order to move the load one meter.