What makes SHM special? Why it is called SHM? What is the non-harmonic? Examples of oscillation that are not SHM?I'll be reporting about oscillation and waves, and there are a lot about these that...

What makes SHM special? Why it is called SHM? What is the non-harmonic? Examples of oscillation that are not SHM?

I'll be reporting about oscillation and waves, and there are a lot about these that confuse me like in what way is pulse related to wave? Are these the same?

It says on the book that waves are involved when you undergo an X-ray examination, light a candle or merely look at something.

How is that? Just by looking at something you can already be creating waves?

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ndnordic's profile pic

ndnordic | High School Teacher | (Level 2) Associate Educator

Posted on

Waves in general are energy in motion. There are two types of waves:  transverse waves which are like the waves you make if you drop a rock into the water, and mechanical waves, which are most frequently involved with sound.  A pulse is a single wave front and is usually shown as moving along a string which has been plucked a single time.  A wave is a multitude of pulses, one after the other, that are continuously moving from the point of origin out into space.

SHM, or simple harmonic motion, involves any motion which is regular and symmetrical. A good example is a pendulum which is swinging back and forth.  The time it takes to go from left to right and the time it takes to go from right to left are equal, assuming of course there is no friction involved.  The period of a pendulum, or any SHM motion is the time it takes to complete one cycle.  SHM can also have a frequency, which is the number of complete cycles completed in one second.

The waves you are talking about re X-rays,  candles, and sight are all different types of electromagnetic radiation and have different wavelengths, frequencies, and energies. In order to see something, light has to hit the object, reflect off, and enter your eyes where it is converted into electric signals which your brain then interprets as images.

neela's profile pic

neela | High School Teacher | (Level 3) Valedictorian

Posted on

A motion is said to be simple harmonic motion, if the acceleration of the motion of the object is directed towards a fixed point and is proportional to the distsance of the object from the fixed point. Here the object moves to and fro about a point or oscillates about a point. The obect moves to one extreme and comes back and moves to another extreme, and again comes back and thus the oscillating movement continues.The motion from one extreme to another extreme is called an amplitude and two consecutve amplitudes make an oscillation.The motion of the object from any point on its path to an extreme and back to the other extreme and return till the same point is also called an oscillation. The motion is a periodic motion, in which the motion repeats after a certain period and so it is called periodic motion or simple harmonic motion. Example: Motion of a pendulum, plannetery mtion, vibratory motion of tunung fork . The projection of a uniform circular motion on any diameter of the circular path. Non periodic motion are  damped motions. Any vibrations of string musical instrument whose vibrations are controlled (by the fingers of the musician).

Any periodical motion can be represented graphically and it looks like a wave. If you graph the displacement of the vibrating particle  vs time it looks like a wave, and is a sine or cosine curve curve.  The sound and light also propogate like waves.

 

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