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As an example of periodic motion but not SHM we can mention the circular motion, in which the centripetal force - which is a kind of restoring force - is perpendicular to the object's motion as centripetal force is directed towards the centre of curvature while displacement is according the tangent to the circle. Elastic Force and Tension", in which elastic force was a kind of restoring force because it tries to send the object back to the original position). In periodic motion, the object's displacement may or may not be in the direction of the restoring force (remember the concept of restoring force explained in Physics tutorial " Types of Forces III.There are two main differences between them. However, simple harmonic motion and periodic motion are not the same thing. Simple harmonic motion is part of a wider category of motion known as "periodic motion", which includes other types of motions that repeat themselves such as circular, vibrational and other similar motions. These back and forth movements are known as "oscillations". In other words, in simple harmonic motion the object moves back and forth along a line. What is Simple Harmonic Motion?īy definition, "Simple harmonic motion (in short SHM) is a repetitive movement back and forth through an equilibrium (or central) position, so that the maximum displacement on one side of this position is equal to the maximum displacement on the other side." What about a pendulum wall clock? The needle of a sewing machine? A tree when wind breeze flows? What kind of motion do these examples involve?Īll situations mentioned above are examples of simple harmonic motion, which we will explain in this tutorial, accompanying it with numerous examples for a better understanding. What happens when you pull an elastic spring and then you release it? Oscillations Learning Material Tutorial ID How does simple harmonic motion occur in oscillating springs?.
#SIMPLE HARMONIC MOTION DEFINITION HOW TO#
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