Sometimes in life the weight you are trying to lift is too heavy: the stress of a new job, the illness of your spouse, another late notice from the bank. Alone we often just cannot accomplish all that is asked of us, nor should we have to in most cases.
Long ago, probably either the Greek’s or Roman’s invented a way to increase a person’s strength by the use of a rope and pulley system. In reality, a person using a pulley (block and tackle) doesn’t get stronger; the weight of the item being lifted appears to shrink. Looping a rope over one pulley and then attaching the loose end of the rope to the object being lifted changes the direction of the force, but doesn’t reduce the effort to lift it. So in effect a 100 pound ball feels like 100 pounds when only using one pulley.However, adding another pulley does reduce the effort by 50% so a 100 pound box feels like 50 pounds.