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...
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
If you still need help with A Level Physics, you should check out Alt Academy, we have a TON of resources, including video lessons, revision guides, 24/7 academic support, handwritten past paper solutions with explanations on each step, and we even have our instructors sit live every night and solve a timed past paper, explaining why they're taking each step.
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.
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.
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
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 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.
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
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
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
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?
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.
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.
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
How uncertain I was on this topic: ±100000000
My uncertainty after watching this video: ±0.0001
lol
Literally explained it better in 20 minutes than any teacher at my school ever has in 2 years.
Somebody give this man a medal.👏👏
🥇
just no
or you just like paying attention when youre alone
literally took me 2 years to understand this ngl
great video mate, helped a tonne + or - 1kg
IMPERIAL?!?! *triggered*
Edit: he changed it from ton. I aint an eejit.
a tonne is the metric unit, a ton is the imperial
I see what you did there :) well said :) you're funny, smart comic I see..
That's some great humor.
me 2@@edgarevanmendez8829
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...
😭 I wish I was back in y12 dying rn in y13
@@simplypotet5561 nah fr
A levels have arrived on your doorstep now...
@@phase0400 yup, I did paper 1 a week ago, paper 2 coming up soon…
Update: 2 years later and I'm back to this video to revise uncertainties for paper 3
This video will never get old..... it's relevance will keep resurfacing timely.... lucky are those who view it while they need to.
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
If you still need help with A Level Physics, you should check out Alt Academy, we have a TON of resources, including video lessons, revision guides, 24/7 academic support, handwritten past paper solutions with explanations on each step, and we even have our instructors sit live every night and solve a timed past paper, explaining why they're taking each step.
My brain hurts
mine too, good night
@@diyapatel3286 Good luck with your exams ; )
@@YazhShah thank you :))
😂😂
Mine 3
wow this is what I actually wanted. A lot of textbooks didn't coverup different types of uncertainty explicitly. Thank you so much
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.
This was so satisfying to learn for some reason, it just makes sense!
I just become a professor in uncertainty in 21 minutes
Easy explanations that clarify all the intricacies in a difficult topic.
Thanks so much.
when I become a Billionaire I will donate 1 Million ± 10% money to your channel :)
I'd be more than happy with 900k.
🔜🔛🔝 #scienceshorts❤️
Wow this was long but extremely useful. Thanks alot, I finally get it.
When ever a new character is introduced
Science shorts guy: Hey is that Bob?
MY TEACHER SPENT 4 HOURS TEACHING THIS AND THIS VID MADE ME UNDERSTAND IN 20 MINS TYSMMM KING
Legit watching this the night before let’s go
I HATE PAPER 3!!!!!
bro I hate all paperss
@@anukritiacharya1629real
@@anukritiacharya1629 bro im 24 now goodluck 😂
@@ygt626 which country u frm?
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 🙏.
I’ve got my final physics paper today. Big thank you for all the videos you’ve posted
2 yrs later and it's my final physics paper today XD. This guy's a savior
Relying on you man.
Hahahahah swear
Final physics paper on 16 June 2022. Appreciate the last minute revision.👍
what was your grade?
@@chamanarasultana7778 c should’ve remarked but hit first choice uni
Can you be my physics teacher? xD
Thanks! You helped a lot :)
thank you, best video I've seen explaining uncertainties which I'll defiantly remember in my exam tomorrow.
How did your exam go?
15:36 was that a DJ Khaled meme ffs :D
bruhhh LOOOL
thank you for this came across a question in a past paper and thoroughly helped me answer it, thank you.
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
ur my hero. literally im in yr13 and I never understood any of this and you changed it.
Thank you so much for this, exams in 2 days really appreciate it 🙏
this was amazingly explained, thank you so much!
I love this video, thank you mate.
U r a legend, Now thats for certain
You sound like Chris Hemsworth
For the EDEXCEL spec however, they consider Micrometres and Vernier Callipers to have 1/2 * resolution.
I should have watched this video at the beginning of y12. But here I am, near the end of y13, finally getting this topic.
1. Nice vascularity sir.
2. I'm 100% certain I am acing this topic after your clear explanation, I'm grateful.
Absolute legend, thank you so much (I think I finally understand uncertainties now)
Good luck everyone for tomorrow!
Same to you!
I like we all came here right before the exams, anyways good luck mate
Andddd im back for paper 2 as it didnt show in p1 😂😂
Stan P good luck! 😝
@@harrietjones1409 cheers bruv. What did you think about p1?
Thanks so much sir! I'm doing A Level physics and uncertainties made no sense but after you explained it I fully understand it.
Great explanation and so useful...
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.
that info about the gradient and best fit was pretty cool.
I have done physics for about 5 years and still NO IDEA how to use a micrometer, weird pieces of equipment
It's not a weird equipment, u are just dumb
'Tis a true "BRUH" moment
lol dumbass
Haha ha ha
@@kanthihirimuthugoda3732 BASED
Bros explains it so well and clearly aswell and this is 5yrs after
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
Actually a saviour I was really struggling with uncertainties.
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 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.
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.🤔
This is amazing. I was so confused before
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
best video to explain the uncertainties ever!!!!!! better than my physics teacher's explaination actually.
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
I'm on AS level
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
You are a hero I really didn't understand how to calculate uncertainity
i never understood uncertainties until i watched this video, thanks
This video saved my life before my exam,thank you
wow your a good teacher bravo and thanks
What an excellent video. Extremely well explained, delivered and narrated. Subbed!
beautifully presented, simple, and very clear.
@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
ur voice is calming
You explain this so much better than my textbook thank you
Genuine lifesaver, thank you so much.
Best explanation of uncertainity on youtube, thanks
At UIUC I was taught to estimate the nearest 10th of the resolution, so that thermometer reading would have been 21.5 +/- 0.5
That's not a 10th, but a half - that is what most consider appropriate. Not me.
who else got AQA paper 3 tmo loool
Boi u know u knowww. Hahaha, I am so screwed
Edexcel tomorrow for me, good luck!
Vortex Warp U 2
good luck Bois, you'll all smash it, bet you're all class
Hahaha same, wish I saw this video earlier tho😂
You have no Idea how much I love you
Thank you soo much it really helped a lot
Hey this really REALLY helped! Thanks so much! God bless you man!
Best 21:42 of resvision ive ever done, thanks a lot!
I watched 8 videos of uncertainty but this one helped the mOST. Thank you so much!
You are a life saver
awesome video it helped lot i will refer it to my classmates and friends
God bless
Assured savior 😄 and i have a physics exam tomorrow.
Great video - cleared up a lot of confusion.
It's amazing..... very impressive 👏 👌 👍
Very well explained. Much respect
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?
Now my Uncertainties is ± 0.001 before it was ± infinite😂. Such a great vedio.
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?
Gosh, I wish I had this when I was doing my finals
wow, ur explanations and videos are amazing and so is the lighting! you should make more videos
Thank you so much mate. I was going to fail my exam before I watched your video😀
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.
EXTREMLY HELPFUL! Thank you very much.
you taught it really well. thanks
THANK YOU SO MUCH 😇😇😇
Great explanation
Hi, your explanation is fantastic. Can you please do an updated video for the International AS level Edexcel Unit 3 paper? 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.
I almost forgot to say...Fantastic summary, thank you
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
This was really helpful, thank you!
Great video thanks a lot
youre brilliant
This helps alot! Thank you!
Very well explained. Today you can tick that box for contribution made to man kind 👍
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