Restoring force

Science

Definition

A restoring force is a force that acts to bring an object back toward its equilibrium position. It is always directed opposite to the displacement from equilibrium and is responsible for oscillatory motion in springs and pendulums.

Examples

  • A stretched rubber band pulling back to its original length
  • A pendulum swinging back toward its lowest point
  • A spring returning to its natural length after being compressed
Key Fact

For a spring: F = −kx (Hooke's law); the negative sign indicates the force opposes displacement

Related Terms

Springs Pendulums Oscillation period Friction

Study This Concept

Practice restoring force with free review games in these units:

AP Physics 1 Unit 6: Simple Harmonic Motion