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... in y change in x Gradient = a = F ?? x b = elastic limit - deformed permanently c = Energy stored this can be worked out by using:- E = 0.5Fx ==> Area of a right angled As the extension increases from the load being pulled down by gravity it gains energy, (Gravitational potential energy) this is converted into elastic energy in the spring, when the load is removed this energy is released, the spring snaps back to its original form. Demonstrating elastic deformation. Beyond this point, the elastic limit, there is plastic deformation. This is when the spring doesn't return to its original shape. More specifically to our experiment we are investigating the effect of the extension when 2 springs are in parallel. Prediction If the springs follow Hookes law then the graph that should be produced should resemble the graph to the left. Showing that as the load increases the extension will increase ...