SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Elastic potential energy in a spring, illustration. Elastic potential energy is the energy stored as a result of deformation of an elastic object, for example the stretching or compressing of a spring. It is equal to the work done to stretch or compress the spring, which depends upon the displacement of the spring from its equilibrium length, and the spring constant, a characteristic of the spring. Hooke's law states that the displacement of the spring is proportional to the force acting on it (red arrows).
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