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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.
The pulley is usually used in sets of two or more to gain a higher velocity ratio and mechanical advantage. Two sets of pulleys are used, one fixed and one moving. The pulleys are mounted, usually side by side, in a block or frame and the apparatus of pulleys and ropes is generally called the tackle. The whole system or machine is known as a block and tackle.