In mechanics and physics, simple harmonic motion is a special type of periodic motion or oscillation motion where the restoring force is directly proportional to the displacement and acts in the direction opposite to that of displacement.‎Introduction · ‎Dynamics · ‎Energy · ‎Examples. In this video David explains the equation that represents the motion of a simple harmonic oscillator and solves. A simple harmonic oscillator is an idealised system in which the restoring force is directly proportional to the displacement from equlibrium (which makes it.


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The equations are called linear differential equations with constant coefficients.

A linear differential equation with constant coefficients is a differential equation consisting of a sum of several terms, each term being a derivative of the dependent variable with respect to the independent variable, and multiplied by some constant. A mass on a spring: Perhaps the simplest mechanical system whose motion follows a linear differential equation with constant coefficients is a mass simple harmonic oscillator a spring: We have already analyzed Eq.

Simple Harmonic Motion Frequency

By numerical integration we found a curve Fig. We assume that in the meantime the Mathematics Department has brought forth a function which, when differentiated twice, is equal to itself with a minus sign. There are, of course, ways of getting at this function in a direct fashion, but they are more complicated than already knowing what the answer simple harmonic oscillator.

We were wrong in the last figure because of the errors of simple harmonic oscillator analysis, but it was very close!

Harmonic oscillator

Now to go further with the original problem, we restore the time units to real seconds. What is the solution then?


So, we're gonna say that X as a function of time is gonna be, well, what's the amplitude? The amplitude here is three meters. So, three meters is our amplitude because that's the maximum displacement from equilibrium, so I'm gonna have three meters out front simple harmonic oscillator then I'm gonna do simple harmonic oscillator because it starts at an extreme value, like either a maximum or a minimum value.

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Cosine of, and then I need two pi over the period. What is my period?

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I look at my graph and I ask, how long does it take to reset? So, started down here at a minimum, when does it get back to a minimum? That took four simple harmonic oscillator.


So, four seconds would be the period, so it'd be two pi over four seconds and then little t, what do I plug in for little t? This simple harmonic oscillator the variable that sits there and waits for me to plug in simple harmonic oscillator I want. So, that's my variable little t that X is a function of.

But I'm not done.

Chapter 5: Harmonic Oscillator - Chemistry LibreTexts

This would be a graph that starts up here and goes down like that. This graph starts simple harmonic oscillator here but that's easy. You just multiply by a negative sine out front and you've turned your cosine into negative cosine and negative cosine starts down here.

So, note our amplitude is still three. If the question asked, what is the amplitude? The amplitude is the magnitude of the displacement, maximum displacement, so that's still positive three meters, even simple harmonic oscillator it started down here, but you could just include an extra negative out front that essentially goes along with the cosine.

That would give you negative cosine and there you have it, that would be your function. So, keep in mind, it's good to remember, if you start up here, you're gonna wanna simple harmonic oscillator cosine.


If you start down here, you gonna wanna to use negative cosine. If you start right here, you're gonna wanna use sine.