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- เผยแพร่เมื่อ 21 ส.ค. 2024
- What is the natural frequency?
What is resonance?
A Level Physics topic suitable for all exam boards including AQA Physics, OCR A , OCR B, Edexcel A Level Physics, suitable for A Level Physics Revision on oscillations.
Music credit for the intro: Royalty free music from Ben Sound
Chapters:
00:10 What is natural frequency?
01:02 What is resonance?
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Nice! We can also see the formation of standing waves, 2 birds with one stone
Oh, didn't actually realise that! 😅 thanks!
Best video on natural frequency and resonance.Thankyou
Thanks a lot! Much appreciated!
paused the video halfway to say this : u look jacked man ;)
literal goat thanks so much all the other explanations from other people were so confusing!
Thanks a lot! Much appreciated!
great work brother keep it up (all the way from kenya)
Thank you very much!
Brilliant video. Thank you for the explanation!
Anytime! Thanks for the comment!
Thanks for the demonstration!
anytime!
Superb demonstrations!!!!
Thanks a lot for the comment!
thanks so much, it is very useful, excellent presentation
thank you for the comment! Much appreciated!
Best explanation so far
thank you so much!
Great video, thank you!
thank you for your comment!
thank you
My pleasure! Glad it was useful!
Very easy to follow thank you!
anytime! thanks for the comment!
King explaining physics
Thanks a lot!
Thank you very much
Thank you for the comment!
Nice explanation
thanks a lot!
What is the natural frequency of the human body and what is the best way to manipulate it? Is it possible to adjust using sound as some have suggested?
I am also wondering same
Hello, Sir.
I never had chance to study physics. At this stage of life I found physics so inyeresting.
My question is: Is it possible to change the locational variable in the enery equation of an object to another locational variable?
Excellent explanation sir.I have a question.Let's say a tuning fork has a natural frequency of 250 Hz and we hit it against the table, does that mean a tuning fork is oscillating back and forth 250 times a second or a tuning fork is creating a sound wave that has a frequency of 250 Hz or both of them?
Excellent question, both of them!
Thanks sir.My doubt is cleared.
anytime!
Very helpful, thank you!
Thanks a lot for the comment! Glad to hear it was helpful!
Amazing video thank you a lot!!!
anytime, thanks for the comment!
Many thaaaaaaaaaaaaanks
Anytime! Thanks for the comment!
that voice change at 1:01 through me off
well, I guess my voice resonated : )
@@zhelyo_physics love your videos
Nice video :)
thank you for the comment!
great video!!
thanks a lot!
Thank you so much! Just curious; I noticed that between the low and high amplitude, the spring seemed to become almost still (visually) What is that? Is that a phenomenon with a spesific name? Would like to learn more. Is it the same thing that happens when running water looks frozen or car rims look still when rotating? Again, thanks!
very interesting. Such an excellent question! Let me explain it intuitively. Imagine you are pushing a pendulum with your hands and a pendulum attached to the ceiling.
If you are pushing at the exact time the pendulum reaches you, its amplitude will increase to a maximum and the pendulum will experience greatest energy transfer.
If you hit a different frequency when your hands are completely out of sync with the pendulum, no energy will be transferred as your hands will just be pushing the air and not the pendulum.
This is essentially what we are seeing. I hope this makes sense! : )
This guy is a mix between Ned Flanders and Captain America
haha I'll take that! : )
An unloaded truck 🚛going fast on a new highway suddenly broke down due to resonance in the crankshaft (perhaps coinciding with the power stroke).
what are the factors on which natural frequency depends?
th-cam.com/video/UBKGsWe4Bmg/w-d-xo.html Excellent question! In the linked video I derive it for a simple system, but every system will have a different equation or motion but this would give you an idea of how it is derived. Hope it helps!
@@zhelyo_physics you are life savor sir
Can a artificial resonance frequency, which is equal to the natural resonance frequency of a metal object, deform metal object i.e. can change its shape?
Absolutely! Search on you tube for a famous case of a bridge getting completely deformed by wind - I think it was the Tacoma narrows bridge.
@@zhelyo_physics there's also the infamous millennium bridge of Thames
thanks for the idea actually! I might see if I can film a video there!
I've read that resonance occurs even if driving frequency isn't equal to the natural frequency. It is for the case when driving frequency is integral multiple of natural frequency. Why do u say about this sir??
So an object can typically vibrate in multiple "modes" of resonance. Totally true.
Joseph Fourier. 😊
What percentage of total mass can be at resonant frequency and still acceptable for the total system? I can’t find any standard about this.
Hmmm I'll look into it, interesting
Question: Why when increasing the frequency more than the natural frequency, amplitude decreases?
correct! Sometimes there are more resonant frequency later on but for A Level Physics if that's the course you are doing this is typically not required to know. Hope this is helpful!
Does the natural differ based on how or how much we initially disturb the system
interestingly, no, the frequency is independent of the amplitude. Excellent question!
Are there formulas to calcuate the natural frequency of various materials? (Glass, steel, copper, etc.)
Presumably the variables would include diameter and length
e.g. a copper bar 6 feet in length and 1" in diameter
or a steel tube 3 feet in length with a 2" internal diameter
Excellent question! They are different in different situations. I discuss this a little bit more in depth here: th-cam.com/video/UBKGsWe4Bmg/w-d-xo.html For a simple oscillating mass on a spring it is sqrt(k/m) but different in each situation. Typically it is simply measured for an object. Hope this helps!
So how do we measure these frequencies…
Most importantly how does one measure specifically the frequency of a static object to when the object is disturbed from a specific location?
So we apply a force and measure the time period of the oscillation with respect to the point. Typically we measure 10,20T and then divide by the number to get an average. Afterwards f=1/T
So if I were to take 2 mounted tuning fork and tap one of them, would both vibrate at the same frequency regardless of the other tuning fork's size?
Mmm I am pretty sure that mass will be a contributing to a different natural frequency. Worth experimenting though with this!
Thank you you are so so so goo❤❤❤❤❤❤❤❤❤❤❤❤❤❤dddddd
anytime! thanks for the comment!
Great video, thank you, is there a way to measure the base frequency that a human emits?
humans and most objects at room temperature emit infrared radiation.
@@zhelyo_physics can it be measured sir?
If you tie this guy's arms down he probably won't be able to resonate his voice that is speak. Yes, some physics humor from a physics professor - I don't move my arms so much.
😂😂😂 Hi Professor! Funnily, someone else commented ages ago that I should be in the arm waving world champions. I'd take that.
@@zhelyo_physics Far better to wave than salute. I could make some jokes about that, but I'll just wave hello and goodbye. BTW: I'm ambidextrous - therefore I can do some wave mixing - a little physics humor.
All confusions has gone.
Aim of this channel! : ) Thanks for the comment!
Does natural frequency change if you apply more tension or force though?
Depends on the specific situation. Generally objects tend to oscillate at an unchanged frequency once the forced that caused the oscillation is removed.
@@zhelyo_physics would the frequency technically be higher in the first second after the force is applied as to a couple seconds after the force is taken off? Do we measure natural freq immediately after the force is taken off or do we wait a couple seconds ?
after the force is taken off the amplitude decreases but the time period remains constant (in most systems, if it's a pendulum only for small angles). I recommend checking this video out for a good understanding of resonance: th-cam.com/video/UBKGsWe4Bmg/w-d-xo.html Good luck! : )
why does amplitude increase dramatically?
So this is beyond the syllabus but a SUPER interesting question, so I filmed the answer here: th-cam.com/video/UBKGsWe4Bmg/w-d-xo.html Hope it helps!
why he kindaa
How to calculate a natural frequency of an object..
You have to measure it using an experiment, looking for the frequency at which the amplitude of vibration is max
@@zhelyo_physics can resonating frequency at any amblitude vibrates that object...
does anyone else think this guy is kinda cute? lol