... the spring the length of the spring increases, (it stretches) and therefore becomes weaker. The force pulling the spring is pulling on each molecule inside it. The force, acting on the molecules, makes them pull away from each other. When this happens the resultant force decreases and the spring extends. (Found information for last sentence in a revision text book) When we add on more springs, in parallel (to the same load), the extension will decrease because the molecules are still being pulled apart, but not as much as before because the force exerted by the load is shared between all the springs. There is the same amount of force as before but now the same amount of force has to pull more molecules (because there are more springs) apart so less extension. Less force acts on each molecule. In series 1 spring In parallel '2 springs' If there are double the amount of springs ...

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