![]() ![]() Another significant difference is that in the case of a pendulum, the restoring force is provided not by a spring but by gravity. However, the period of a pendulum is determined not by its mass but by its length. Simple pendulums behave much like harmonic oscillators such as springs. ![]() This is exactly the same graph as we get if we plot the position of a mass on a spring bouncing up and down in simple harmonic motion as a function of time. If we plot only the vertical position of the point as the disk turns, it produces a sinusoidal graph. Consider a point on the rim of a disk as it rotates counterclockwise at a constant rate around a horizontal axis. There is a close connection between circular motion and simple harmonic motion, according to Boston University. (Image credit: Georgia State University) Circular motion If the displacement of the mass is plotted as a function of time, it will trace out a sinusoidal wave. ![]() A ball on a spring is the standard example of periodic motion. ![]()
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