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Oscillations

Hooke's law

Every elastic medium resists deformation. When an elastic object is deformed, then it develops a force, the restoring force, which wants to restore the original shape of the object.
For an ideal elastic medium the restoring force is proportional and opposite to the deviation from its original shape (Hooke's law).

restoring force = - elasticity constant × displacement

In symbols

F_el = - C_el × u



Example