![]() This force is called the restoring force. ![]() In each case, we can see that the force exerted by the spring is towards the equilibrium position. If we push the block inwards, there is a force exerted by the string towards the equilibrium position.If we pull the block outwards, there is a force exerted by the string that is directed towards the equilibrium position. ![]() When we pull the block and then release it, it performs to and fro motion about its mean position. Let x=0 be the position of the block when it is at its equilibrium position. The block is placed on a frictionless horizontal surface. The small oscillations of a block fixed to a spring, which in turn is fixed to a wall are the simplest example of simple harmonic motion.
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