Is Spring force a restoring force?

Yes, the spring force is a restoring force, because the force exerted by the spring is always in the opposite direction to the displacement. This is why there is a negative sign in Hooke’s law equation. According to Hooke’s law,

The force required to stretch an elastic object such as a metal spring is directly proportional to the extension of the spring for small distances. The force exerted back by the spring is known as Hooke’s law.

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