If a mass is hung on a spring and pulled down slightly the mass would start moving up and down periodically. The motion of an object that moves to and fro about a mean position along a straight line is called simple harmonic motion. It swings to and fro about its mean position where the string and the bob undergo the motion.
A good example of SHM is an object with mass m attached to a spring on a frictionless surface as shown in Figure 152.
Simple harmonic motion definition is - a harmonic motion of constant amplitude in which the acceleration is proportional and oppositely directed to the displacement of the body from a position of equilibrium. Simple harmonic motion describes the vibration of atoms the variability of giant stars and countless other systems from musical instruments to swaying skyscrapers. Simple harmonic Motion occurs when a particle or object moves back and forth within a stable equilibrium position under the influence of a restoring force proportional to its displacement It is used to model many real-life situations in our daily life. Simple Harmonic Motion In simple harmonic motion the acceleration of the system and therefore the net force is proportional to the displacement and acts in the opposite direction of the displacement.