Hey guys if you found this useful, you will probably find my Physics Workbook very useful for practice: zphysicslessons.net/ultimate-uncertainties-physics-workbook-
@engineeringmadeasy
6 ай бұрын
May I ask you what do I get in this workbook. Thanks
@zhelyo_physics
6 ай бұрын
sure! It's 50 multiple choice questions organized by difficulty to give you a good work out. In a previous comment though you mentioned you struggle more with written questions, so if you find calculating uncertainties easy, this is probably not the workbook for you. This video covers similar questions: kzitem.info/news/bejne/rYeMqGZ9cJOSlY4si=95LhXKYmo9SndDE0
@ES-rv5ik
4 ай бұрын
Sir can I use this workbook for AQA exam board ?
@zhelyo_physics
4 ай бұрын
@@ES-rv5ik absolutely, hope it's useful
@ES-rv5ik
4 ай бұрын
@@zhelyo_physics Thank you for you reply sir how about the other workbooks ? Are they valid for AQA exam board as well?
@romxsayeppie
11 ай бұрын
i am lowkey in love with your videos at this point
@TM-fk4po
Жыл бұрын
Hi from Zimbabwe 🇿🇼 my brother I really appreciate your content. Keep on Making physics a fun subject to learn
@PPV0077
5 күн бұрын
zim gang
@absolutelynot_here
6 ай бұрын
i'm not doing physics a-levels but i love these videos! i'm in year 11 rn. THANK YOU for making this so fun
@zhelyo_physics
6 ай бұрын
thanks for the comment! I actually have a GCSE channel too if it helps: www.youtube.com/@ZGCSE Good luck with your GCSEs!
@ZarbiDW
3 ай бұрын
Same, preparing to do physics a level of my GCSEs go well
@Riaaaa19
3 ай бұрын
Just finished yr11
@shadymostafa9711
2 жыл бұрын
Thank you!! Your videos are a life saver for exams🙏
@zhelyo_physics
2 жыл бұрын
Anytime! Glad to hear!
@karannub6353
7 ай бұрын
great lecture man, may god bless you
@zhelyo_physics
7 ай бұрын
thank you very much for the comment!
@kiedkad4477
5 ай бұрын
I just started your 48 video playlist, you are saving my april mock
@zhelyo_physics
5 ай бұрын
best of luck going through the content. Let me know if something doesn't make sense!
@BigPosay
6 ай бұрын
SOOO HELPFULL OMGGG I LOVE YOU
@zhelyo_physics
6 ай бұрын
Glad this is helpful!
@nowhere8358
Ай бұрын
For multiplying/dividing part of combining uncertainties, I understand why we use the percent uncertainties (different units), but why do we add them? I understand when we add or subtract values, but not for multiplying and dividing.
@ahnafrafedahsan929
16 күн бұрын
best physics teacher on the planet
@zhelyo_physics
16 күн бұрын
Thank you so much for the kind comment!
@turty7323
Жыл бұрын
These videos are so good thanks
@zhelyo_physics
Жыл бұрын
Thank you so much for the comment!
@neophasha5592
5 ай бұрын
thank you man you helped me a lot keep it up
@zhelyo_physics
5 ай бұрын
anytime, thanks for the comment!
@hardik05jain
9 ай бұрын
Can Someone please suggest a similar kind of channel for A level Biology... I really need it. btw, great conceptual videos. Really helpful for exams
@zhelyo_physics
8 ай бұрын
thanks a lot for the comments! I am no expert in Biology but I think Miss Estruch Biology is a very good channel for A level Bio. Good luck!
@hardik05jain
8 ай бұрын
Thank you@@zhelyo_physics your recommendation is really helpful. I checked that channel out and it turned out to be a real help.
@hadiyashujaat
8 ай бұрын
@@hardik05jain try behology
@QuaternionPhysics1
2 жыл бұрын
Do you have a video on how to read/use a micrometre and Vernier Scale? Thanks
@zhelyo_physics
2 жыл бұрын
No yet, but thanks for the idea. For a standard micrometre the standard can be summarized in: twist the micrometer gauge until what your measuring (say a wire) is feeling a little bit of pressure from the micrometer (not too much as it will damage it). Then each turns of the wheel (line on the gauge) represents 0.5 mm. For exam questions remember to say measure the diameter on mutliple parts along the wire, then average. Hope this helps!
@QuaternionPhysics1
2 жыл бұрын
@@zhelyo_physics thank you!
@MontyBleiker
10 күн бұрын
Hi, I may have misunderstood something here, but at 26:50, you measured the length as 0.15m, with the smallest reading on the ruler as 0.001m. Wouldn’t the uncertainty here be +/- half of that value? I’ll give an example to explain my thoughts process. If you had a meter ruler and measured something to be 0.54m, and the smallest possible reading of the ruler is 0.01m, then wouldn’t the only possible deviation of the measurement from the true value be from 0.535 and 0.545, as anything lower or higher respectively would give you a different initial reading like 0.53m or 0.55m, meaning the deviation either way of what you measured is really only 0.005m making the uncertainty 0.54 +/- 0.005m? Please correct me if I have misunderstood what you were saying. Thankyou
@zhelyo_physics
9 күн бұрын
Interesting question, there are two ways to think about it, one that you are actually taking two separate measurements of two separate coordinates, each of absolute uncertainty of half a mm. Combining them to get a total uncertainty of 1 mm (this appears a lot in aqa and edexcel), OCR generally assumes absolute uncertainty to be the smallest measurable value. Hope this helps!
@MontyBleiker
9 күн бұрын
@@zhelyo_physics yes that clears things up. Thankyou so much
@georgeglynatsis8632
Жыл бұрын
Your videos are amazing! You should also do one on alternating current, rectification, rms, etc.
@OliverSnow-c6u
10 күн бұрын
hey i have my first AQA A Level Physics lesson tommorow hopefully this is valid for AQA :)
@zhelyo_physics
10 күн бұрын
it definitely will! Good luck on your first lesson!
@ellaillustrates9350
2 ай бұрын
Wonderful!!!
@zhelyo_physics
2 ай бұрын
Thank you for the comment!
@codex2765
2 жыл бұрын
what software is this? and can we download these notes?
@zhelyo_physics
2 жыл бұрын
It's microsoft whiteboard and just the videos for now but they cover most of the spec.
@blinkerpoderoso3187
2 жыл бұрын
thanks alot!!! really helpful
@m4rzb4rz-qq3yq
11 ай бұрын
26:29 Don't we have to give the absolute uncertainty in terms of the measurement of the value? e.g 15cm±0.001cm
@zhelyo_physics
11 ай бұрын
not necessary however for further calculations the units need to be the same on the left and right. I do this a couple of minutes later in the video in terms of meters. Could also be done in cm. Hope it helps!
@m4rzb4rz-qq3yq
11 ай бұрын
@@zhelyo_physics Thanks! Your videos are helping me a lot
@EleniNova-i9d
10 ай бұрын
Hello Sir , Thank you so much for your wonderful well taught videos , I just wanted to ask wich syllabus are you specifically going by?
@zhelyo_physics
10 ай бұрын
I originally made these videos for OCR A, however all syllabuses are extremely similar, at around 90%. The best way to use them is use your syllabus as a check list. Hope this helps!
@shadowdragon1892
3 ай бұрын
TIME TO BINGE THISS WHOLEE PLAYLIST
@zhelyo_physics
3 ай бұрын
Good luck! Drop a comment if something doesn't make sense.
@Sachin-pi3zu
Күн бұрын
At 28:09 isnt the absolute uncertainty for 0.15 m should be 0.01 , instead of 0.001?
@zhelyo_physics
Күн бұрын
mmm 1mm in metres is 1x10^(-3)m hope this helps!
@Sachin-pi3zu
4 күн бұрын
Sir at 16:18 you were putting p=f/a, which is mg/a then why you put 1/2mg÷a (you told half hecause of ' foot ' , sir i didnt get the logic??). Can you explain why foot means 1/2?
@zhelyo_physics
3 күн бұрын
So half of the force is distributed on each foot : ) hope this helps!
@oskarwitha_k8258
2 жыл бұрын
at 25:23, why is the absolute uncertainty 0.125 instead of 0.13? i thought that the absolute and percentage uncertainty needs to be the same significant figures as the number
@zhelyo_physics
2 жыл бұрын
correct! Of course, just testing if anyone would notice of course.
@bipintimilsina5134
Жыл бұрын
@@zhelyo_physics 😂😂😂
@RodelaZaman
4 ай бұрын
Thank you so much for your efforts sir! By any chance can i have access to this mind map/the doc you are writing these notes in? Would really help for my revsion later on...
@zhelyo_physics
4 ай бұрын
anytime! Sorry only the videos are accessible. Good luck revising.
@diyaresf2296
3 ай бұрын
thanks
@zhelyo_physics
3 ай бұрын
anytime
@HowardWU-ck9xz
2 ай бұрын
when you calculate the percentage uncertainty, you should multiply 100% instead of 100.
@zhelyo_physics
2 ай бұрын
Hi it's essentially the same way of writing it out. Both would be accepted.
@HowardWU-ck9xz
2 ай бұрын
@@zhelyo_physics i dont think so. 100% is 1. If you write down 5÷20×100 without any explanation, the result can only be 25 but never 25%. You can say it is a habit or a trick to make calculation easier, but it is mathmatically wrong. thanks for your reply anyway.
@zhelyo_physics
2 ай бұрын
Think of the percentage as a unit at the end, at an A-Level exam you would not be marked down for it : )
@whoopnoop4043
5 ай бұрын
Hi I dont quite understand why current is a base unit. Its charge per second, but a second *is* a base unit by itself??
@zhelyo_physics
5 ай бұрын
Mostly due to historical reasons. Current is just very easy to measure with an ammeter. Theoretically you can choose any other to be a base unit and redefine all the other units in terms of that.
@iqr-xc9ju
Жыл бұрын
Hello, shouldn't the aboslute uncertainty be writting in 1 significant figure? like instead of 0.125 it should be 0.1??
@zhelyo_physics
Жыл бұрын
It depends on the amount of significant figures given for the uncertainty in the question. If it is 1 then, yes. If it is more, then that number. Hope this helps!
@engineeringmadeasy
6 ай бұрын
Hi, have you done any exam questions on this topics. Thanks for you videos.
@zhelyo_physics
6 ай бұрын
anytime! Yes, lots of them. Check this video out for starters: kzitem.info/news/bejne/rYeMqGZ9cJOSlY4si=ZNdGKYzZRU_IDPRq
@ayzee4
2 жыл бұрын
Does this syllabus cover all of the syllabus, if no, which ones are missing?
@zhelyo_physics
2 жыл бұрын
Hi, this + my all of vectors video covers all of Module 2 OCR Physics A. If you are doing a different exam board you can google the syllabus and use the time stamps to see if there is anything different.
@uouuou-fh7vm
6 ай бұрын
Sir, I want to use your playlist to only study for AS-level stuff. Can you please tell me what videos come under units one and two? Also, can these videos be used to study for January 2025 exams edexcel?
@zhelyo_physics
6 ай бұрын
The best thing to do is to get a print out of your specification and use it as a checklist. Best of luck preparing, you got this!
@An_Iron_God69420
Жыл бұрын
would it still be systematic error if the values slowly only increase\decrease at higher and higher values/ the values only increase\decrease at higher and higher values? or lower?
@zhelyo_physics
Жыл бұрын
Hm, I would need to look at the exact situation. If they don't increase by the same amount across all readings it can't be a systematic error.
@An_Iron_God69420
Жыл бұрын
@@zhelyo_physics at high values the readings increase by larger and larger amounts, ( on a mass balance for eg: after 150 kg it increases more and more, and under 20 kgs it decreases by a larger amount)
@fadisaeed6739
Жыл бұрын
@@zhelyo_physics if it increases with a constant factor like 1.1 or any constant number than yes
@ifeoluwaayinla6129
Жыл бұрын
Which software did you use for the notes in the video?
@zhelyo_physics
Жыл бұрын
Hi, I used Microsoft Whiteboard. The new version of this though runs very slowly and I might look at alternatives. Still worth it for notes though, it's also free.
@josephmulligan3247
3 ай бұрын
why did u use uncertainty = resolution, not resolution/2?
@zhelyo_physics
3 ай бұрын
some exam boards take that to be the case (annoying as it should be standardised), if you are doing aqa they typically take it as resolution/2. Hope this helps!
@abiralgautam1327
2 жыл бұрын
Sir, thanks for the video! Can you share the notes?
@zhelyo_physics
2 жыл бұрын
My pleasure! Sorry pal, only the videos are available
@abiralgautam1327
2 жыл бұрын
@@zhelyo_physics Sir ,in that estimation question ... If the pressure is exerted by only one foot won't that foot exert more force than that of standing on two feet?
@zhelyo_physics
2 жыл бұрын
standing on two feet yes, but the question was asking about to pressure from just 1 foot. Hope this helps!
@uouuou-fh7vm
3 ай бұрын
Sir, do you do edexcel physics past paper questions?
@zhelyo_physics
3 ай бұрын
most of my videos are applicable to all exam boards and if not I tend to leave a note in the title. I don't have specific Edexcel past paper walkthroughs though if this is specifically what you are looking for. Hope this helps!
@sadeenalabsi
10 ай бұрын
your videos are amazing!!! but i would really appreciate if i can have a free revision worksheet to work on :)
@hamidSohail-vy3ei
Жыл бұрын
does your playlist for AS Level physics covers all the topics as per the requirements for cambridge Alevels...
@zhelyo_physics
Жыл бұрын
There might be some minor differences but the physics across all exam boards is over 90% similar. So check with your syllabus which you should be easily be able to google. Good luck and drop a comment if something doesn't make sense! : )
@shahanislam1364
Жыл бұрын
Are these videos valid for edexcel international a levels board
@zhelyo_physics
Жыл бұрын
yep! Physics is physics and the syllabuses are incredibly similar, always have a check with the spec before any resource/test though for any minor differences.
@oskarwitha_k8258
2 жыл бұрын
at 38:08 are we able to rewrite the final answer as 25.0 +- 4% ??
@zhelyo_physics
2 жыл бұрын
yep!
@sanmdi3799
2 жыл бұрын
Would it be correct to say that the absolute uncertainty from a graph is: line of worst fit gradient - line of best fit gradient?
@zhelyo_physics
2 жыл бұрын
Absolutely yes! : )
@cryptedshadwssacred9195
Жыл бұрын
At 5:36 why is 10/10^-3 equal to 10^4, how did you get that?
@zhelyo_physics
Жыл бұрын
10/10^(-3)=10/(1/10^3)=10*10^3=10^4 Hope this helps!
@teacupcakes2739
Жыл бұрын
so will all these videos with lots of practice on past papers will guarantee me an A or B
@zhelyo_physics
Жыл бұрын
Nothing can guarantee a grade, but this will help a lot.
@bekind6869
2 жыл бұрын
is the percentage uncertainty in the last question -40%?
@zhelyo_physics
2 жыл бұрын
Hi, it's 4%, the denominator in the fraction is 4.0 not 40.
@lesliemafuta4632
Жыл бұрын
For 16:32 doesnt the mass weight remain the same even standing on one foot?🤔 I think you have to divide the area by two
@zhelyo_physics
Жыл бұрын
the question assumes that a person is standing on two feet and asking for the pressure on one of them. The estimated area is already for 1 foot with those dimensions. Hope this helps!
@Miftahul_786
Жыл бұрын
@@zhelyo_physics I believe that the person was talking about the Force on the numerator itself not needing to be halved. If a person steps on a scale with both feet and weighs 70kg, their mass is still read as 70kg on the scale even if one foot is planted on the scale. So the force is not halved. You stated I think that the area of *one* “shoe”/ foot is 0.03m^2, so there does not need to be any halving for one foot. The equation can remain as mg/A which is (70x9.81)/0.03=22890 Pa
@zhelyo_physics
Жыл бұрын
@@Miftahul_786 that would be correct if the person was standing on one foot. My question assumed the force to be equally shared between two feet, i.e. what is the pressure from a single foot when a person is standing on two feet. I can see the ambiguity, though! : )
@yeeti4279
9 ай бұрын
what does that mean if the mass is the same no matter how many feet are on the scale. surely you just work out the weight of the person by doing 70*9.81 then dividing that by the area of one foot since the weight doesnt half with one foot. im so confused @@zhelyo_physics
@yeeti4279
9 ай бұрын
ok is the person standing on the scale with one foot and the other foot raised or is the person standing on the scale with one foot and standing on the floor with the other one @@zhelyo_physics
@Bulldog01234
Жыл бұрын
can you please explain how you got 1/2mg in the estimates section??
@zhelyo_physics
Жыл бұрын
Sure, just assuming that each foot is carrying half the weight. Hope this helps!
@Bulldog01234
Жыл бұрын
@@zhelyo_physics yep, got it. Thank you.
@bipintimilsina5134
Жыл бұрын
@@zhelyo_physics But is that the case sir it wont it be Same amount of mass the foot is caarying the whole mass
@rabbiatariq1644
Жыл бұрын
this can help in physics a2 p5 right?
@zhelyo_physics
Жыл бұрын
Yep, check with your syllabus though.
@aaa-qs1ol
2 жыл бұрын
is this for aqa?
@zhelyo_physics
2 жыл бұрын
Hi, it's applicable to all exam board but best to check with the aqa spec for differences. I teach OCR and the content is very similar.
@mahdiarab8776
Жыл бұрын
Bruh Can U provide the pdf note of the whole AS Topics
@zhelyo_physics
Жыл бұрын
Sorry only the videos are available, you can use them to create your own notes though.
@electroxlite5950
3 ай бұрын
W
@TM-fk4po
Жыл бұрын
Hi from Zimbabwe 🇿🇼 my brother I really appreciate your content. Keep on Making physics a fun subject to learn
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