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Back and forth motionby viciam
Tags: motion 
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#1
Dec513, 03:48 PM

P: 27

Hi guys,
I'm not a physicist or a mathematician but I have a question which will probably sound silly to you all I need to know what that motion is called when you have an object and it moves up and down. But it gains more momentum every time it reaches the top so when it drops it goes down further and faster and when it reaches the maximum bottom it comes back up even faster and further and this cycle just keeps repeating. On every completion of up and down movement it goes further and further down and further and further up In one word please tell me what this is called so I can google it. I inertia and reciprocating but this is not it. I know there's one word to describe this but I just can't remember it. Thanks 


#2
Dec513, 03:55 PM

P: 383

In a periodic motion object moves back and foirth about its mean position.
The kind of motion you are describing can be more precisely called a 'Simple Harmonic Motion'. Now you can google those two terms i described above 


#3
Dec513, 04:08 PM

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P: 7,298

Try "resonance".
But don't get sidetracked into crackpot websites about perpetual motion machines, "free energy", etc. 


#4
Dec513, 04:12 PM

Mentor
P: 41,369

Back and forth motion



#5
Dec513, 05:11 PM

P: 27

These all sound pretty complicated.
I thought it was as simple as a pendulum swing or something 


#6
Dec513, 05:32 PM

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#7
Dec513, 06:33 PM

P: 1,994

Can be modeled as a forced oscillator, as already mentioned. But the math is not so simple, even for a "simple" pendulum, at large amplitudes. 


#8
Dec613, 02:40 PM

P: 27

This is exactly what I'm trying to find out. You see how the waves become larger and larger as they go along? I typed in increasing oscillations in Google to get this image.



#9
Dec613, 04:27 PM

P: 519

See page 4 of this about forced vibration.
http://www.stewartcalculus.com/data/...Orders_Stu.pdf 


#10
Dec613, 09:46 PM

Thanks
P: 5,869

A oneword description for this motion would be "impossible". Or "nonphysical". Or "imaginary". It does not exists in nature. The amplitude of oscillations may increase for a while, but then it will either reach some maximum level, or "bifurcate" into some other motion, which is a fancy way of saying "break into pieces".



#11
Dec613, 10:16 PM

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P: 41,369




#12
Dec613, 10:21 PM

Thanks
P: 5,869




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