Restoring force

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In physics, the restoring force is a force that acts to bring a body to its equilibrium position. The restoring force is a function only of position of the mass or particle, and it is always directed back toward the equilibrium position of the system. The restoring force is often referred to in simple harmonic motion. The force responsible for restoring original size and shape is called the restoring force. [1] [2]

An example is the action of a spring. An idealized spring exerts a force proportional to the amount of deformation of the spring from its equilibrium length, exerted in a direction oppose the deformation. Pulling the spring to a greater length causes it to exert a force that brings the spring back toward its equilibrium length. The amount of force can be determined by multiplying the spring constant, characteristic of the spring, by the amount of stretch, also known as Hooke's Law.

Another example is of a pendulum. When a pendulum is not swinging all the forces acting on it are in equilibrium. The force due to gravity and the mass of the object at the end of the pendulum is equal to the tension in the string holding the object up. When a pendulum is put in motion, the place of equilibrium is at the bottom of the swing, the location where the pendulum rests. When the pendulum is at the top of its swing the force returning the pendulum to this midpoint is gravity. As a result, gravity may be seen as a restoring force.

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This glossary of physics is a list of definitions of terms and concepts relevant to physics, its sub-disciplines, and related fields, including mechanics, materials science, nuclear physics, particle physics, and thermodynamics. For more inclusive glossaries concerning related fields of science and technology, see Glossary of chemistry terms, Glossary of astronomy, Glossary of areas of mathematics, and Glossary of engineering.


  1. Giordano, Nicholas (2009–2013). "Chapter 11, Harmonic Motion and Elasticity". College Physics: Reasoning and Relationships. Volumes 1 and 2 (1st, 2nd ed.). Independence, KY: Cengage Learning. p. 360. ISBN   978-0-534-42471-8. LCCN   2009288437. OCLC   191810268.
  2. Beltrami, Edward J. (1998) [1988]. "Chapter 1, Simple Dynamic Models". Mathematics for Dynamic Modeling (2nd ed.). San Diego, CA: Academic Press. pp. 3–7. ISBN   9780120855667.