A restoring force acts toward an equilibrium when a body is displaced from it. In one dimension, taking displacement at equilibrium, this means for sufficiently small nonzero . An ideal linear spring has with positive spring constant , producing simple harmonic motion for a constant mass without damping. More general restoring forces need not be linear.
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Restoring force is a fundamental concept in physics, particularly in mechanics and oscillatory motion. It refers to the force that acts to bring a system back to its equilibrium position or original state after it has been displaced. This type of force is crucial in understanding systems such as springs, pendulums, and other oscillatory systems.