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
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.
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
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 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
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
@@WillWright77 welcome to the club my friend. just know the majority of students have done little work compared to this good students so we should do well
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!
At 2:45 isn't the reading meant to be 21.0°C +/-0.5 as the measurement (reading in this case) is suppose to have the same dp as the absolute error and also since we are always allow to estimate to a decimal place lower than the smallest division on a scale.
This is the big debate. I would argue that as you cannot judge perfectly whether it's gone past half way, an uncertainty of 0.5 means that the true value could lie outside of this.
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.🤔
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.
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.
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?
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.
Hey, I don't quite understand the reason you assigned a zero error value of 0.5mm to the ruler at 3:59 . Isn't the card already placed at the 0 mark, so there isn't any zero error? If anyone knows why he assigned that 0.5mm value at the start please feel free to explain, thank you.
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
How uncertain I was on this topic: ±100000000
My uncertainty after watching this video: ±0.0001
lol
Lol
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.
My brain hurts
mine too, good night
@@diyapatel3286 Good luck with your exams ; )
@@YazhShah thank you :))
😂😂
Mine 3
MY TEACHER SPENT 4 HOURS TEACHING THIS AND THIS VID MADE ME UNDERSTAND IN 20 MINS TYSMMM KING
wow this is what I actually wanted. A lot of textbooks didn't coverup different types of uncertainty explicitly. Thank you so much
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
Legit watching this the night before let’s go
This was so satisfying to learn for some reason, it just makes sense!
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 🙏.
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.
Wow this was long but extremely useful. Thanks alot, I finally get it.
when I become a Billionaire I will donate 1 Million ± 10% money to your channel :)
I'd be more than happy with 900k.
🔜🔛🔝 #scienceshorts❤️
Easy explanations that clarify all the intricacies in a difficult topic.
Thanks so much.
15:36 was that a DJ Khaled meme ffs :D
bruhhh LOOOL
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
When ever a new character is introduced
Science shorts guy: Hey is that Bob?
Relying on you man.
Hahahahah swear
1. Nice vascularity sir.
2. I'm 100% certain I am acing this topic after your clear explanation, I'm grateful.
ur my hero. literally im in yr13 and I never understood any of this and you changed it.
thank you, best video I've seen explaining uncertainties which I'll defiantly remember in my exam tomorrow.
How did your exam go?
Can you be my physics teacher? xD
Thanks! You helped a lot :)
You sound like Chris Hemsworth
He just doesnt tho now does he
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
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?
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
thank you for this came across a question in a past paper and thoroughly helped me answer it, thank you.
this was amazingly explained, thank you so much!
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😂
Bros explains it so well and clearly aswell and this is 5yrs after
U r a legend, Now thats for certain
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)
I love this video, thank you mate.
I HATE PAPER 3!!!!!
bro I hate all paperss
@@anukritiacharya1629real
@@anukritiacharya1629 bro im 24 now goodluck 😂
@@ygt626 which country u frm?
I'm so scared for as level
I should have watched this video at the beginning of y12. But here I am, near the end of y13, finally getting this topic.
Great explanation and so useful...
Actually a saviour I was really struggling with uncertainties.
This is the perfect video for London ALs bro Thank you so much👍
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
that info about the gradient and best fit was pretty cool.
Thanks so much sir! I'm doing A Level physics and uncertainties made no sense but after you explained it I fully understand it.
best video to explain the uncertainties ever!!!!!! better than my physics teacher's explaination actually.
This video saved my life before my exam,thank you
I truly regret watching it....
after failing exam not before😫😥
This is amazing. I was so confused before
Best 21:42 of resvision ive ever done, thanks a lot!
For the EDEXCEL spec however, they consider Micrometres and Vernier Callipers to have 1/2 * resolution.
What an excellent video. Extremely well explained, delivered and narrated. Subbed!
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
You are a hero I really didn't understand how to calculate uncertainity
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
You have no Idea how much I love you
Best explanation of uncertainity on youtube, thanks
You explain this so much better than my textbook thank you
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
Hey this really REALLY helped! Thanks so much! God bless you man!
safe
Genuine lifesaver, thank you so much.
i never understood uncertainties until i watched this video, thanks
11:04 isn't going to plus or minus one even if wasn't concentrating
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 hate being alive so much
test tomroow?
@@Armwrestlingphilosopher only my a-level exam
@@WillWright77 welcome to the club my friend. just know the majority of students have done little work compared to this good students so we should do well
@@Armwrestlingphilosopher I’m praying you’re right
Assured savior 😄 and i have a physics exam tomorrow.
Thank you so much mate. I was going to fail my exam before I watched your video😀
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.
beautifully presented, simple, and very clear.
You are a life saver
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!
At 2:45 isn't the reading meant to be 21.0°C +/-0.5 as the measurement (reading in this case) is suppose to have the same dp as
the absolute error and also since we are always allow to estimate to a decimal place lower than the smallest division on a scale.
This is the big debate. I would argue that as you cannot judge perfectly whether it's gone past half way, an uncertainty of 0.5 means that the true value could lie outside of this.
It’s really helpful thank you so much sir ❤❤❤❤
Gosh, I wish I had this when I was doing my finals
ur voice is calming
Great video - cleared up a lot of confusion.
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.🤔
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.
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.
thanks you so much, it really helped. u got a new subscriber
who got AQA unit 3 tomorrow
Hell yeah
RIP am I right
Watching this 30 mins before the exam!
How did you guys do?
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?
awesome video it helped lot i will refer it to my classmates and friends
God bless
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
Hey, I don't quite understand the reason you assigned a zero error value of 0.5mm to the ruler at 3:59 . Isn't the card already placed at the 0 mark, so there isn't any zero error? If anyone knows why he assigned that 0.5mm value at the start please feel free to explain, thank you.
Now, I probably wouldn't.
🤣🤣🤣
you taught it really well. thanks
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.
THANK YOU SO MUCH 😇😇😇
I watched 8 videos of uncertainty but this one helped the mOST. Thank you so much!
This was really helpful, thank you!
EXTREMLY HELPFUL! Thank you very much.
Thanks for this video. I am not losing any more easy marks because I forgot how uncertainty works bois
Shouldnt the value be +-0.32 m/s as the zero in front is not considered a significant figure? 15:08
Who else watching for CIE O/N session?
me lmao
BRUHH got exam tomorrow and watching today ripp
exam in like fukin 2 hours lmao
@@thegeeksides how did your exam go?
Poshak Pathak it went surprisingly okay for me. I didnt revise for AS physics, I did the whole revision in 3 hours. 😂 how bout you?
Very well explained. Much respect
Now my Uncertainties is ± 0.001 before it was ± infinite😂. Such a great vedio.
9:35 so surely the resolution of the voltmeter is 0.01V and so u half that to get the uncertainty??
Wow this is way easier than anything my my teacher said😂 thanks so much