Question

Can you explain in terms of energy transfer why a spring pulled 14 cm down from equilibrium oscillates another 14 cm up form equilibrium?

Answer 1

When a spring is pulled down from its natural position, it stores potential energy.

when we pull down a spring by 14 cm then some amount of energy is stored in it now when we release it this energy will convert into some other form of energy but as we know from the conservation of energy law that energy remain conserved so that is why it will rise upto 14 cm.

The above statement is true only when air resistance negligible and spring to be perfect means no deformation.

In real world, it will rise lower than 14 cm because of resistances. but in no case will the spring rise above 14 cm as energy can be converted from one form to another but can never be generated by itself or without any external forces.