F-J's Physics concentrates on interesting physics topics and physics experiments both for interest and for GCSE and A Level.
F-J's Corona Busters: Bespoke lessons for KS3, GCSE, and A Level Physics for use by science students who's schools are closed.
Do Do This At Home: Short videos with fun 'try at home' physics and science experiments. [See disclaimer below]
F-J and Stef's Quirky Tours: Quirky travel films and guides of the more unusual things to see and do in some towns and places.
Other video blogs on a range of topics that interest me.
Disclaimer: NOTE: DO NOT attempt any of the experiments that I do unless you are FULLY conversant with any risks they involve and you are aware of all of the health and safety implications of doing them. I have 30 years of physics teaching experience and sometimes the videos make things look easier than they actually are. CLEAPSS in the UK is an excellent resource for such matters. Stay safe!
Yes. they do as they are directly connected to the + and - of the power supply all of the time. There will of course be a tiny fluctuation when the ball touches but nothing that one would notice at all. It would be a different matter if a huge charge was put on plates and then they were disconnected and the experiment run again. The ball shuttling would have the effect of slowly passing opposite charge to each plate and neutralising them bit by bit! Good question and thanks for watching!
@@pintchigawza6496 It is a 5kV school (low current) EHT power supply. www.science2education.co.uk/product/power-supply-units/EL10370 However, you must know what you are doing when using these to keep safe.
Excellent demonstration. I tried to write a comment but it was deleted. Here is another thought: I wonder if Ultrasound could be directed with a Microwave to extend its propagation distance? Here is an example of the type of ultrasound I had in mind: Ultrasonic Obliterator at 170,000fps - The Slow Mo Guys
Thanks. It is an unusual piece of apparatus isn't it! I did not delete the comment but when you comment there are two buttons very close together 'Cancel' and 'Reply'. I have typed a long comment before and hit the Cancel button by mistake and lost it all! I will have to look at the Slow Mo Guys video - thanks for the tip and for watching and taking the time to comment a second time!
Please consider supporting my work by buying me a coffee at www.buymeacoffee.com/francisjonesa Helps me buy bits and pieces to make these videos! Very many thanks, F-J
Maybe someone else can clarify, but afaik the Darlington array and even the BFY51 transistors are really only needed because there needs to be enough current on the other side of the transformers to drive the LED pairs for each segment of the 7-segment display. If you want to just read the binary data from the core rope memory you probably dont need nearly as much current and can therefore trim a lot of the current boosting transition circuitry
Good question and I hope this answers this. Remembering that each core is used as one bit of data and it works as a transformer, you do need an AC signal to make it work. I use the transistors here to switch this AC (square wave) on and off depending on whether it is a lit or not lit LED that is needed. They LEDs or the cores cannot be directly driven from the 7 segment display chip if that makes sense. That is why there are two 555 timers - one to scroll the digits and one to proved the cores' high frequency signal that gets switched on and off. Hope that helps and thanks for asking!
Thanks Neil! Yes, those gates! Lots of getting in and out. Not very common on public roads anymore but at least the handbrake held! Thanks for watching and taking the time to comment too!
Another great video F-J! I love the maths of this one and also the challenger reference, I’ve never heard that before but it does make a lot of sense. Well done Barry for all his help in your wonderful videos, a chip of the old block for sure. 😎❤️👍
Thanks and great to hear from you! Yes, this was an interesting one to make. The Challenger connection is facinating - I think I forgot to make it clear that the issue with the SRBs caused a flame front to leak out burning out the O rings but I guess that was obvious! I think it is a great bit of maths too! Must do solids of constant width at some stage. Working on a few maths based ones at the moment which I think you will enjoy. Hope to get them sorted soon!
Absolutely spot on, thank you! I’ve been fiddling with this for ages, will have to remove the battery for access but at least I know how to get the bulb out now. :-)
This has given me an idea how to make something (not a ball) I've been thinking about for some time, foil will work but I think I will be using a hydraulic press not a hammer.
What a great video, I think putting different shaped ones on the same chassis makes it much more interesting, you haven't quite got square gears out of your system have you🤣 Tony J
Thanks! Glad you liked it! Yes, my thoughts go in phases and it's gears etc. at the moment. Now, here is an interesting idea that I have not seen done before: what I want to do is put a belt all the way round it so it becomes a level but odd shaped rotor caterpillar track. I think that would be fun and very counter intuitive! Sounds like something Colin Firze would build (with a massive engine on it!).
Yes, not what I expected at all but I learnt something from them that one must not forget fluid dynamic effects in blood flow too! Physics is everywhere!
Pleasure! Glad you liked it. Rather niche but I thought it is something that people should see regardless! Hope you enjoy some of the other videos too. Do let me know!
Thanks Muhammad. Is there anything more technical that you would like me to explain or to add? If so I can add it to the pinned comments. I made this video as a general science example so it was not meant to be too technical but I get your point - there is so much more one can say about strobes and strobing effects! Thanks for watching and taking the time to comment.
@@AnthonyFrancisJones How rotational speed of the fan can be matched with the frequency of light, by determining the amount of time the fan rotates to it's position and having that frequency in the light etc, overral a little more depth on technical side.
@@MuhammadAnas_Official Thanks, that's a good idea and would allow for the introduction to angular velocity ideas. I could do the experiment with a swinging pendulum too to show the similarities of linear (small amplitude) oscillations to circular motion. I guess I only have under an hour in my lunch break and no script so they are a bit quick and simplified but I do really value your input. It is always great to get suggestions even for other videos such as the Tennis Racket Effect or the Halbach Effect which were both suggested by different subscribers. There is so much interesting physics out there!
Not _quite_ as spherical as ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ZMByI4s-D-Y.html (!) but pretty good nonetheless. It would be interesting to see what the material is like in cross section close up, e.g. with a scanning electron microscope. A good proportion of it must still be air with a bit of oxide too, but I wonder how it's distributed.
Yes, I remember that sphere when it was discussed in Physics World a few years ago. Not quite that close indeed! I really would not want to cut it in half but would be interesting to see what it looks like. Ultrasound would just produce an mess of an image I think. Adam Savage did a good job with the water jet cutting ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-onZDAKJq6z4.html I really feel that, whilst there must be lots of voids, dirt/oxide etc. the layers may well have got close enough to form metallic bonds. It was a fun project regardless and thanks as ever for your interesting observations. Do keep them coming!
Please consider supporting my work by buying me a coffee at www.buymeacoffee.com/francisjonesa Helps me buy bits and pieces to make these videos! Very many thanks, F-J
Please consider supporting my work by buying me a coffee at www.buymeacoffee.com/francisjonesa Helps me buy bits and pieces to make these videos! Very many thanks, F-J
Please consider supporting my work by buying me a coffee at www.buymeacoffee.com/francisjonesa Helps me buy bits and pieces to make these videos! Very many thanks, F-J
Please consider supporting my work by buying me a coffee at www.buymeacoffee.com/francisjonesa Helps me buy bits and pieces to make these videos! Very many thanks, F-J
Please consider supporting my work by buying me a coffee at www.buymeacoffee.com/francisjonesa Helps me buy bits and pieces to make these videos! Very many thanks, F-J
Please consider supporting my work by buying me a coffee at www.buymeacoffee.com/francisjonesa Helps me buy bits and pieces to make these videos! Very many thanks, F-J
Please consider supporting my work by buying me a coffee at www.buymeacoffee.com/francisjonesa Helps me buy bits and pieces to make these videos! Very many thanks, F-J
Please consider supporting my work by buying me a coffee at www.buymeacoffee.com/francisjonesa Helps me buy bits and pieces to make these videos! Very many thanks, F-J
Please consider supporting my work by buying me a coffee at www.buymeacoffee.com/francisjonesa Helps me buy bits and pieces to make these videos! Very many thanks, F-J
Excellent. Thank you. I wonder if placing the two hemispheres around a charge detector probe would add to the intuition that they are neutral on the inside? It make me quite sad to think about all the superbly-crafted old physics demo apparatus just gathering dust in lab store rooms; well done to you for giving that beautiful set a new lease of life.
Thanks for your kind comments. Any charge detector that relies on the presence of electric field lines would of course would read zero. One would have to be careful to check that you were not 'distorting' the closed surface as it were by introducing an object that would have to be able to communicate with the outside. Yes, as you say, school and university cupboards must be full of these dusty old items with many instructors having no idea what they are or what they were used for and the amount of skill and effort that went into making them! I have an old Archimedes' bucket and cylinder, and the spring balance to go with it which I must make a video of at some stage. Thanks again for watching and taking the time to comment.
Thanks Carol, so pleased you liked it. Hope it is not looking too dated by now. I have had one in the can for Oswestry for years and never got around to filming it! I do love Shrewsbury though!
Good question. Normally a tube with an electron gun has a strong vacuum in it to stop loss of energy and scattering of the electron beam. This one is rather unusual in that it has a small amount of helium in it to make the beam visible for educational purposes. Normally that would not be a good thing! Hope that helps and thanks for your excellent question.
Thanks very much for your kind comment. Yes you are right, not an easy one to explain and I almost got into a bit of a tangle myself as it is all done in an hour or so of my lunchtime break! Hopefully got the general theory of this experiment across - one which I think most people/teachers have not seen or heard of.
Nice demo and explanation! I reckon a diagram showing the +ve and -ve charges would be useful here and wonder why you didn't show one. I guess one of your aims in these videos is to avoid additional graphics where possible?
Thanks for this and you are absolutely right on all counts. It would have made things much clearer (and for me too trying to keep my explanation going correctly as it is all done 'live', I do not use a script). And yes, my videos all started from simple classroom explanations but as they have got tricker they would benefit from added graphics which at the time of filming, Aug 2021, I was not really into or a fan of! Thanks as ever for your comments and glad you liked this rather forgotten experiment. More coming soon I hope!
That's a really good question and your guess is way out!! It is a old motor driven, relay controlled school (Griffin) centisecond timer! I should do a video on it! collections.st-andrews.ac.uk/item/centisecond-timer/1005577
Really nice project and yes, Curious Mark is one of my fav channels too. Have you considered installing a second multiplexer(s) on the bottom right pcb and 10 toggle switches, or 4 sets of 3 switches for Octal switching to allow one to enter most any character or symbol from the ASSCI set. Then you'd have an excellent training tool for others to generate any character/numeral they desired. I was with DEC, Digital Equipment corp, for years and remember well the core mem bds used on the PDP 8 and other earlier PDP systems. Even with 32 K of core and some massive CDC disk drives with a business with 30 to 40 terminals being used intermittently worked great, However, those poor hard drives took a daily beating doing all of the IO now relocated to mostly huge arrays of RAM. To their credit, those CDC drives could run for years wo any issues as long as the absolute filters were changed and heads were cleaned frequently on a PM schedule. The 70's -90's were great years to watch the computer industry evolve to the appliance computers we all enjoy these days. Shame how only a small percent of people have any understanding of what happens at the low levels where 0's and 1's still make it all play when you order a new widget on Amazon or watch some video on one of the movie services...LOL
Glenn, thanks for taking the time for such an interesting story. Yes you are right. Those of us that were brought up with computers that had visibly moving and interconnected parts have a much better understanding of what happens 'under the bonnet' (hood!) as it were. I remember as a pupil using the school's ICL mainframe and doing 'dir' requests and hearing the hard drives accessing a room away as the heads moved in and out on the massive drives and disk packs! Really good idea of yours to put switches onto the project to use it to demonstrate ASCII characters. I think I want to leave this board alone as it is just hanging together! I would probably break something! Have you seen my other videos on the magnetic core memory I have? I thing there were links in the description. Thanks again, it is comments and experiences that people like you share that make these objects come to life. Many thanks again, Anthony F-J.
Thanks Ralph. That's really kind of you. I was trying to show something a bit unusual but interesting that perhaps does not have a lot of coverage on RU-vid already! I just never cease to be amazed by what you can do with these Teltron tubes!
Ooh love it! Now I understand the rotation control on my CRO so much better!! Really enjoy your videos, the topics, your presentation style (the music) and your bear mascot!!
Thanks Lindsay! That's really kind of you. Glad you like the videos - made this one a while back but it's and interesting topic. Let me know if there is anything else that interests you that I might be missing and thanks for making it all worthwhile.
@@shivenprashar1427 It's a Cathode Ray Oscilloscope (CRO). Now they are usually just flat screens so may only be referred to as an oscilloscope. The device for showing rapidly changing voltages on a screen. Thanks for asking.
Excellent practical model demonstration of a Lobe Positive Displacement Pump, amazed how well you made it work with solid balls, The smoke demonstration worked better than I thought it would. All the important points of a lobe pump covered. Thank you for all the time you spent making this model and the video. Tony.
Thanks again Tony. If I had put a motor on it (it would probably have jammed!) I think the smoke demo would be less 'pulsed' due to the way I was turning the gears by hand. Bit of fun but not a build I want to repeat in the near future!
Sir I have a confusion regarding the language of a question. Though it's not related to this video, I hope you can help me to figure out the solution. It was actually a question in NEET chemistry 2024. I have no problem with the concept of the question but confusion from a linguistic point of view. The question is The Henry's law constant (Kh ) values of three gases (A,B,C) in water are 145, 2×10^-5 and 35 kbar , respectively. The solubility of these gases in water follow the order 1. A>B>C 2. B >A >C 3. B >C >A 4. A>C> B There is an inverse relation between Henry's law constant and solubility, so i marked the answer as 2. But the answer according to the answer key is 3. I took k bar to be the unit of the last term only and considered the other two in bar. K bar can also be thought of as 10^3 bar . Moreover the comma was before the word respectively so I ascribed the unit to the last term only. Have I misunderstood the question or is the language actually confusing? Please help me if possible.
Yes, it is a badly worded question. Three values all in kbar. so A is 145kbar, B is 2x10^-5kbar, and C is 35kbar. So A is 145000bar, B is 0.145bar and C is 35000bar. So A, C, B in order of largest first but because of inverse relationship the answer order is B,C,A so answer is 3. Hope that helps! Keep studying hard!
@@AnthonyFrancisJones Should there have been a comma before kbar? I considered k bar for the last term only and took the others in bar so got option 2. And thanks a lot for replying I took 145 bar, 2×10^- 5 bar and 35 k bar So the order came to be B>A>C 😞😓
Yes, every value (unless it is a real trick question!) should have units with it, so go with kbar for all of the numbers in this case. Badly set question I would say! You have got it now though! It shows me that you understand the science really well but need to keep practising this type of question so you are used to the things they get up to! Not your fault!
@@AnthonyFrancisJones Thanks for the encouraging words. I actually took it to be a tricky question because if indeed kilobar was meant for the last value, most people would miss it. I took it that way because tricky questions are often asked in entrance exams. I was worried about my English grammar 😅
I had lots of ideas after school and ended up doing a form of Production Engineering. I then did a post graduate course so I could be qualified to teach physics. All good fun and none of this ever narrowed down the opportunities that I managed to get! Do a general engineering course and you can always specialise later unless you are really keen to do a specific one such as Mechanical or Electrical or Electronic, or Civil for example. All good courses lead to opportunities, many of which you can never plan for!
Sorry about that. I have had a listen through again and don't seem to hear what you refer too. I know my large lab has quite an echo and it was filmed during the working day in a school. I now film with a tie clip mic which helps. Any further suggestions greatly received.
