The restoring force pulls a system back to equilibrium. It is a force that opposes the displacement of an object away from its equilibrium position, working to bring the system back to its stable state. Examples include tension in a spring or gravity in a pendulum.
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The force of gravity acts as the restoring force in a pendulum. When the pendulum is displaced from its equilibrium position, gravity acts to restore it back to its original position. This restoring force causes the pendulum to oscillate around the equilibrium point.
For a system to oscillate, it must have both inertia (resistance to change in motion) and a restoring force (a force that brings the system back to its equilibrium position after being displaced). These two properties are necessary for the system to oscillate back and forth around a stable equilibrium point.
The force that causes the periodic motion of a pendulum is gravity. When the pendulum is displaced from its resting position, gravity acts as a restoring force that pulls it back towards equilibrium, resulting in the swinging motion.
A pendulum has periodic motion because as it swings, the force of gravity acts as a restoring force that constantly pulls it back towards its equilibrium position. This causes the pendulum to oscillate back and forth in a predictable manner.
The restorative force is a force that acts to return an object to its original shape or position after it has been deformed or displaced. This force is typically present in systems where potential energy is stored, such as springs and elastic materials.