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### Conservación de la energía en springs

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Physics - Conservation of energy in springs

Conservation of energy in springs

There are often energy transfers between kinetic energy [1] and strain
energy. [2]

If a moving object is stopped by a spring and all the kinetic energy [3]
of the object goes into compressing the spring, then the strain energy must
equal the original kinetic energy - the area under the _F-x_ graph will be
equal to the original kinetic energy. An object can start moving because
energy in a spring is released - in the case of a perfectly elastic [4]
spring, the strain energy equals the kinetic energy the object gains.

If an object collides with an elastic material, its kinetic energy is
transformed into elastic potential energy. [5] This potential energy can
then be transformed back into kinetic energy. This is what happens when a
basketball hits a wall and bounces back - at one instant during the
collision its kinetic energy is zero. At this point the energy is stored as
strain energy.

Sometimes, however, not all of the energy stored may be returned as
kinetic energy of the colliding objects. (This is an inelastic collision
[6] - to be covered further on.) This can be the case even for objects
obeying Hooke's law [7] during deformation.

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