How uncertain I was on this topic: ±100000000 My uncertainty after watching this video: ±0.0001

Literally explained it better in 20 minutes than any teacher at my school ever has in 2 years. Somebody give this man a medal.👏👏

great video mate, helped a tonne + or - 1kg

I was so confused after doing uncertainty in class but this video cleared it all up. Many thanks, just started A level physics and I think I'l be back to this channel a lot over the next 2 years...

My brain hurts

This video will never get old..... it's relevance will keep resurfacing timely.... lucky are those who view it while they need to.

I just become a professor in uncertainty in 21 minutes

Hey, thanks for all the videos you make on physics, it really helps me consolidate my knowledge coming up to the AS exams, and I also like your sense of humour. It always makes me chuckle hearing you complain about how rubbish a past paper question is or whatnot

Some digital device reading can have zero errors if they aren't zeroed(calibrated). Eg. There's a zero button in digital scales, but if you press it when there's a weight on it, it will use the weight as the starting point of the reading instead of 0, hence zero error.

I HATE PAPER 3!!!!!

wow this is what I actually wanted. A lot of textbooks didn't coverup different types of uncertainty explicitly. Thank you so much

This was so satisfying to learn for some reason, it just makes sense!

Legit watching this the night before let’s go

when I become a Billionaire I will donate 1 Million ± 10% money to your channel :)

When ever a new character is introduced Science shorts guy: Hey is that Bob?

Can you be my physics teacher? xD Thanks! You helped a lot :)

You sound like Chris Hemsworth

Wow this was long but extremely useful. Thanks alot, I finally get it.

Easy explanations that clarify all the intricacies in a difficult topic. Thanks so much.

MY TEACHER SPENT 4 HOURS TEACHING THIS AND THIS VID MADE ME UNDERSTAND IN 20 MINS TYSMMM KING

You made me understand it in 2 minutes when it takes school a year and still doesn't make you understand the subject well, thank you 🙏.

15:36 was that a DJ Khaled meme ffs :D

I’ve got my final physics paper today. Big thank you for all the videos you’ve posted

Relying on you man.

thank you for this came across a question in a past paper and thoroughly helped me answer it, thank you.

thank you, best video I've seen explaining uncertainties which I'll defiantly remember in my exam tomorrow.

thankyou for this video. Because of you i got an A in my physics test. I really appreciate the video. I'm looking forward to more videos

Final physics paper on 16 June 2022. Appreciate the last minute revision.👍

this was amazingly explained, thank you so much!

I love this video, thank you mate.

ur my hero. literally im in yr13 and I never understood any of this and you changed it.

So when matching precision of our calculation to the recorded values, do we use the least precise sig fig or dp? I hope that made sense... Also, thank you for saving my life with this video!

I have done physics for about 5 years and still NO IDEA how to use a micrometer, weird pieces of equipment

U r a legend, Now thats for certain

For the EDEXCEL spec however, they consider Micrometres and Vernier Callipers to have 1/2 * resolution.

Good luck everyone for tomorrow!

Bros explains it so well and clearly aswell and this is 5yrs after

This is the syllabus which you need for the exams. However it is obviously dodgy and not what professional physicists do. Like the prof suggests, That first thermometer example would be recorded as 21.4 with a visual reading uncertainty of +/- 0.2 or similar. We humans are not blind and can easily read between the lines and we can appreciate our visual error here is about maybe a tenth or 2 tenths of a division. In fact stating 21 +/- 0.5 would be very dodgy as just a tiny misread could so easily have given 22 +/- 0.5. Also a good scientist will look at the box to find the manufacturers estimated confidence in readings, and then possibly add an extra 0.1 or 0.2 to his uncertainty. It is unfortunate that the exam boards have tried to oversimplify things for the sake of a simple syllabus and by doing this they are preventing students from thinking clearly for themselves. They are therefore presenting science like english literature like something to be memorised. The exam boards need to get more feedback from top class physicists who are not nervous to give their opinions.

Thank you so much for this, exams in 2 days really appreciate it 🙏

Absolute legend, thank you so much (I think I finally understand uncertainties now)

who else got AQA paper 3 tmo loool

Great explanation and so useful...

I feel like there are discrepancies if you don't know the insruments precision why is the uncertainty + or - 1 x lowest sig.fig and not 0.5 x lowest sig.fig since the measurement might be calibrated

What an excellent video. Extremely well explained, delivered and narrated. Subbed!

Thanks so much sir! I'm doing A Level physics and uncertainties made no sense but after you explained it I fully understand it.

that info about the gradient and best fit was pretty cool.

Does the fact that Uncertainty for readings is half the resolution,and for measurements it is the resolution,hold up even in higher studies or just till the A'levels?

This is the perfect video for London ALs bro Thank you so much👍

we got this stuff for bridging work so I haven't even started physics a level and they've given us this with no help -_- Thanks a ton dude u helped me understand. I would've been a wreck :D

I should have watched this video at the beginning of y12. But here I am, near the end of y13, finally getting this topic.

In the Assumed Uncertainty part of the video. I believe you gave the Resolution. For example you stated the voltage as 5.27V the resolution of the reading is the smallest possible value which is 0.01V. The uncertainty will be 0.01V/2 half the resolution. Correct me if I’m wrong sir? Is this something unique to Edexcel A level exam board since this is what the MS I have seen are doing.🤔

My undergrad professor very loosely explained uncertainty but still expected us to do it. He didn't care if we did it right he just wanted us thinking about it. Because of that I never learned how to do this properly

This is amazing. I was so confused before

1. Nice vascularity sir. 2. I'm 100% certain I am acing this topic after your clear explanation, I'm grateful.

Actually a saviour I was really struggling with uncertainties.

What if you weren’t given the percentage uncertainty value when working out v^2? Would you go straight to doubling the +or- m/s value instead?

I believe the initial example is wrong; the resolution of the scale markings provide a guide, not a hard limit, to the precision of the reading/measurement available from a given metrological instrument. For example, if I had a metre stick with no markings, I could still take a reading to within half a metre (or a third or a quarter). Similar applies to the example in the video of a reading which can be seen to fall closer to 21.5 than either 20.0 or 21.0. So a reading of 21.5 degrees +/_ 0.5 degree is reasonable and correct (not 21 +/_ 0.5). No? Just feedback and comment, thanks for the vids, they are awesome.

safe

i never understood uncertainties until i watched this video, thanks

I hate being alive so much

best video to explain the uncertainties ever!!!!!! better than my physics teacher's explaination actually.

11:04 isn't going to plus or minus one even if wasn't concentrating

Hey this really REALLY helped! Thanks so much! God bless you man!

You are a hero I really didn't understand how to calculate uncertainity

Gosh, I wish I had this when I was doing my finals

@Mr Hassan's math Chanel and you ...be ready u will both get a shout-out in my graduation speech...i couldn't have made it with out u

Had a question come up with a percentage uncertainty on v in a enquire with v^1/2 and it does halve uncertainty apparently which I find crazy

hi, not sure if this has been pointed out, but you mentioned that we must keep the number of figures from the measurements/reading the same when making calculations, but what about in the calculation of h^2 down to h, can u reduce the number of sig figs there in that case? or might that risk a loss of marks, helpful video nonetheless

At UIUC I was taught to estimate the nearest 10th of the resolution, so that thermometer reading would have been 21.5 +/- 0.5

This video saved my life before my exam,thank you

i realized my bunch of uncertainties isn't add up, it's a quadrature, in a result it's close to 0 ,dominated by the uncertainties of learning this.

You explain this so much better than my textbook thank you

It is my understanding that the first measurement for the thermometer can be written as 21.4 degree Celsius, because you know 21 for certain and then estimate the next place value (uncertain value). You are allowed to do this when the tool counts by 100, 10, 1, 0.1, 0.01, etc. This will then lead to the nominal and uncertainty having the same number of decimal places which is another rule? Please advise.

ive got an exam tomorrow help

Best explanation of uncertainity on youtube, thanks

You have no Idea how much I love you

beautifully presented, simple, and very clear.

wow, ur explanations and videos are amazing and so is the lighting! you should make more videos

Genuine lifesaver, thank you so much.

Important question: All I ask is how I find percentage uncertainty of potential difference from a voltmeter for the resistivity practical, in order for me to find the percentage uncertainty of resistance. The absolute uncertainty for me is +- 1*10^-2V but the voltage is constantly being changed so there is no fixed value to put into the formula. Essentially I just need someone to explicitly say which method is correct. E.g. Find average Pd and use average formula, however the Pd is not just a repeat reading as it is proportional to the dependent variable of resistance. Please just tell me explicitly how we find percentage uncertainty in this case.

If we have an equation connecting some quantities, and I need to find the relative uncertainty of a quantity which is not the subject of the formula in the equation. Why does the quantity has to be change into the subject of formula before I could find the uncertainty?

9:35 so surely the resolution of the voltmeter is 0.01V and so u half that to get the uncertainty??

who got AQA unit 3 tomorrow

When you stated the absolute uncertainty in the velocity 15:04 you only gave it to 1 s.f but the actual velocity was given to 2 s.f. However, when you square rooted 50 (16:47) you gave the answer to 2 significant figures so 7.1 but the actual height 50, was only given to 1s.f.. Are you supposed to give the uncertainty to the no. of significant figures or the no. of decimal places?

I got sick and had to to to the hospital so I skipped my physics class once. I miss out on this. it doesn't end there, tommorow there's a test about this uncertainty. Thanks really helped me to get the base

Thank you so much mate. I was going to fail my exam before I watched your video😀

At 8:55 you said that the uncertainty should have the same number of decimal places as the measurement, while in the example of measuring with a termomether (2:05) you wrote an uncertainity of 0.5 when the reading on the instrument was an integer number. Why is that so?

If a balance shows a reading, doesn't that mean we can estimate the error of a mass using a 2-decimal place top-pan balance to ± 0.005 g? Shouldn't the error for readings using digital devices be the smallest increment?

Well my teacher did not teach any of this lol

You are a life saver

thanks you so much, it really helped. u got a new subscriber

Thanks for this video. I am not losing any more easy marks because I forgot how uncertainty works bois

Why we add and subtract uncertainty if it is greater thanany no. Like 21 so we can write it like 21+uncertainty

Then why do we often "measure" temperature (of the atmosphere, for example) when we aren't lining anything up with the measuring device we're using?

ur voice is calming

I watched 8 videos of uncertainty but this one helped the mOST. Thank you so much!

What is the error in your last example of determining acceleration...

Great video - cleared up a lot of confusion.

15:06 isn't 0.3 to 1 significant figure and 4.4 is to 2 significant figures so instead the uncertainty should be 0.32