Classical Mechanics - A Level Physics

[@DrPhysicsA]

I cover pretty much all the material for A levels (ie taken at age 16-18). My lectures currently do not cover anything like the material needed for undergraduate physics. I am gradually building up the material but at best I suspect I shall generally cover only that which is dealt with in 1st year undergraduate studies.

[@G--qq2bo]

My man, you cover this better than the vast majority of US undergraduate fundamental physics courses. You actually show the mechanical logic of getting from Force to the various standard formulae when my instructors taught us to memorize them and plug n chug. This is invaluable, and I tip my hat to you good sir.

[@saferehman8234]

Hi sir, Is there anything major missing from these for a levels, or is it all In the a level playlist?

[@sathishkabekody3083]

0:39 - Newton s 1 st law of motion 3:01 -Newton a 3rd law of motion 9:00 -deriving position displacement equation 9:46 -deriving kinetic energy equation 11:30 - momentum 12:56 - conservation of momentum 15:01 - elastic and inelastic collisions 17:28 -potential energy 18:35 -impulse 21:19 - power 22:28 - force at an angle 23:47 - rules for adding & subtracting vectors 25:03 - moments & torques

[@sheshij64]

Thanks:)😁

[@beoptimistic5853]

kzbin.info/www/bejne/rHenfpR-hpmejZo ..💐

[@princeistalri7944]

Your videos explain the topics at hand concisely and simply, even complex ones. Thank you for making these videos, your teaching style is fantastic. It bothers me that so many instructors simply tell you the equations and tell you to memorize it, without explaining the derivations of or reasons for said equations. It turns a lot of people off of science and mathematics, as well as undermining the underlying consistency and elegance of physics.

[@AlchemistOfNirnroot]

:P Yeah, the amount of looks and comments you get when you say you picked Physics for A-Level. I haven't started yet but with my A Level course I believe we're doing Classical Mechanics (picks up from Further Physics at GCSE - which is good) or Material Physics then we do Quantum behaviour regarding constructive interference mainly to do with the Young Slip experiment. That's AS but A2 is Electromagnetism and something else. 10 more days :P But, it can wait as today is the Doctor Who Series 8 premiere! :D

[@magomano272]

i couldn't have agreed with you more

[@princeistalri7944]

Aimen Munir ^_^

[@AlchemistOfNirnroot]

Prince Istalri AS: Mechanics, Materials, Electricity, Nature of Light, Waves and some medical physics. A2: Further Mechanics, Electromagnetism, Astronomy, Nuclear Physics, Particle Physics and some other various stuff.

[@Axel-vp6on]

Hi, I'm 14 and I've been reading a book called 'classical mechanics' 'The theoretical minimum' and it's great it explains very well, it's aimed at people at the age of 18 but I understand it, so I recommend you read it :)

[@jetpaq]

Those 1st 11 minutes were more informative than any lecture I have seen. No disrespect to khan, who is very thorough, but this was masterfully executed, without unnecessary dialogue. Although, I still love khan.

[@aniketpatil793]

Khan helped me understand the basics very well its just that this is inline with my portion and khan is not

[@taasinbinhossainalvi9173]

Khan is more aligned with US curriculum

[@sjegannath6295]

@@taasinbinhossainalvi9173 no bro i'm an Asian and I found it more than fine for me with my curriculum too

[@DrPhysicsA]

Video being uploaded now. Should be online in about 60-90 mins. Hope it helps. Good luck with exam on Friday.

[@abdulqadirtirmizey2727]

Sir, By grace of Allah and your helping videos, I have scored B-Grade in my A-level Physics Exam. By the end of January, I was totally zero at Physics and scored lowest in class. And by the start of February, I started watching your A-level revision videos. Since, I didn't scored well in my AS-Level exams, I was giving composite paper, so the burden on me was double. Believe me sir, by the end of March, I covered the whole syllabus of AS-Level, and 80% of A-level. You know, April is the month of tests for A-level student, and since I had covered almost all of my syllabus, I performed really well in those tests. And then, in A-level exams, I performed excellently. Due to which, I scored B-Grade in Physics. This grade is enough to get admission in Architecture (My dream) and excellent for a student like me :D All thanks goes to you sir, these videos are the reason I scored so well. Thank You So Much.. :D Yours Truly, AbdulQadir Tirmizey

[@DrPhysicsA]

Excellent. Well done. Delighted to hear your news. All good wishes for your future studies.

[@abdulqadirtirmizey2727]

Thank you Sir. It really means a lot. I wish someday, I would be able to get a chance to help you in some aspect... I'd be honored :) And right now, as a return gift, I am spreading your videos, as more as possible. :D

[@Taqsunis]

mashallah

[@NinjaDestruction]

AbdulQadir Tirmizey What was your revision techniques may I ask

[@NinjaDestruction]

AbdulQadir Tirmizey I'm in the position you was in and I would love to know

[@BlitzStudioz]

Had a bet with my friend, whether school is useful. He learnt this at school after 3 month, me, 30 minutes and some revision.... Thank you for this, seriously, much better than a cocky teacher handing out worksheets for every lesson

[@billb.4901]

Online education can be much better than sitting in a classroom with cocky teachers and worksheets. I went to an RN nursing school in the US, where all they did was read powerpoints to us for 6 hours per day; I told them that I didn't need them to read to me. With online videos, students can pick the best instructors any place on earth and not have to settle for what could be poor instructors employed by the school systems.

[@fadhlysukawidjaja174]

agreed

[@Dylanvignola]

The real question is can you come back in 3 months, 6 months, a year, whatever and remember all this and do work and experiments on all this without rewatching the video everytime to remind you? The point of worksheets is to allow you to practice what you learn so that you can remember it in the future... A bit like learning a song on an instrument... Practice makes perfect.....

[@xi7837]

we see your pain

[@steves1015]

Ok I’m 5 years late to this comment. But one of the problems teachers face is sheer number of students in a class - all with different abilities, different speeds, attention spans etc. I teach chemistry to classes of 25ish. It gets really frustrating not being able to cover everything you need to in class because of silly things (people messing around, not listening properly, etc). You also have to monitor everyone and try to give as much support as possible. And some students are just shy in class. I much prefer small groups up to about 6 students - you tend not to get the disruptions, everyone is more focused (usually), and it is easier to provide individual help. I agree there are some shit teachers in schools out there who do little for the students, but also please remember that other teachers have issues in part because of the logistics in a school setting.

[@DrPhysicsA]

There is a video on thermodynamics in the A-level physics revision playlist. There are also other videos which have a thermal content.

[@VeganoGuy]

These videos are brilliant. I'm 47 and it's all flooding back to me. I will have to buy a Physics textbook with problems to solve. These are much appreciated.

[@DrPhysicsA]

You can use any letter in the alphabet to represent a variable. But it is fairly common to use the letters v and u to represent the final and initial velocities.

[@Kouglizia]

There are just some people who are blessed with the gift of teaching and can make you want to learn more. You, Sir are one of them. Your explanations are so clear and concise that it is a pleasure to follow your lessons. In fact, I wish you would some day tackle the subject of Einstein's theory of relativity. Perhaps beside Einstein himself I can certainly count you among a handful of teachers that can convey his message very clearly. The least that I can say is that you are a brilliant teacher!

[@DrPhysicsA]

You should look only at the forces on a particular object. What are the forces on the table? That is what will cause the table to move. There is indeed a force on you (which would cause you to move - except friction probably stops you). In other words Newtons 3rd law does not result in equal forces on the SAME object.

[@DrPhysicsA]

Yes you are right. These formulae assume constant acceleration. When we use g for a we use a near earth situation where g can be regarded as being constant. But of course, over a larger distance, g is changing so these formulae are less helpful. That's where analytical mechanics comes in (on which I've done a separate video). But you shouldn't need to know that for A level.

[@DrPhysicsA]

You may find the videos on friction and banked turns in the A-level playlist helpful.

[@yoramalon5273]

This brit gentleman is the best teacher on youtube. Glad i found him again.

[@DrPhysicsA]

I've thought about that but different boards cover different elements. And in some videos I cover material which goes across both. I hope the titles give enough info to enable the viewer to see which videos are most appropriate for their particular syllabus.

[@DrPhysicsA]

I'm busy today but will try to do a quick video tonight. I take it you want the situation where a gun is fired upwards at an angle θ and you want to resolve it into vertical and horizontal components and calculate its trajectory.

[@morgengabe1]

If you are able to distinguish between what is meant by U and what is meant by V then yes, they are just symbols. U is used to represent the starting velocity of the body in motion, V is used to represent the velocity of the body at any point in time, these differences just make it easier for people to understand the first time, in future you'll see them change from teacher to teacher and student to student.

[@danishmollah3631]

this is so good that I regret not coming across this 2yrs ago lots of love

[@DrPhysicsA]

Yes. See the two videos on Fluid Dynamics in the A level revision playlist.

[@DrPhysicsA]

The playlist is primarily a revision playlist for those who have already covered a full A level course. It can also be used as a taster or starter for A level physics material, but it is not intended to (and cannot) replace a full taught course.

[@DrPhysicsA]

That's very kind of you. Thanks. If it helps I shall be delighted.

[@callycap3]

As a chemistry student struggling with quantum mechanics and particle physics, your videos are a godsend. Thank you Dr Physics!!

[@DrPhysicsA]

I have just responded to another person who has noted this glitch. I don't have the original, but I will see if there is a way of unsticking the video. Thanks for letting me know.

[@DrPhysicsA]

Thanks for comment. You are right. I was trying to get to the absolute value of impulse. But strictly, as you say, I = mv-mu which in the example given is m*0 - m*v1. I'll put an annotation to that effect. Thanks.

[@DrPhysicsA]

You'd need to check with your exam board. But my understanding is that you are allowed to use a calculator as long as it isn't a programmable calculator (ie one on which you might have stored information which could assist you in the exam)

[@DrPhysicsA]

It has done the same for me. It didn't used to do that. There must be some fault on KZbin. I no longer have the original but I will see if there is anything that can be done to solve the problem of the video freezing. Thanks for alerting me to this.

[@DrPhysicsA]

In effect yes. As I said earlier, I was just trying to show how v=a+at could be converted to v^2=u^2+2as. Since one term has v=.. and the other has V^2=... it makes sense to square the v equation and see what you get.

[@DrPhysicsA]

I agree with the explanation given below. We usually use V to represent the final speed and U for the initial speed or velocity.

[@DrPhysicsA]

Thanks. Just what I would say. I hope the titles of the videos help to identify which bits of the syllabus I am covering.

[@DrPhysicsA]

Is the second ball at rest? And does it also move in a circular path of radius r? If so, angular momentum mvr is conserved. So mvr + 0 = mv1r + 2mv2r (where v1 is the velocity of mass m after collision and v2 is velocity of mass 2m after collision). The m and r terms cancel. v= v1 + 2v2. Kinetic energy is also conserved (elastic collision). Solve for v1 and v2 (which will be in opposite directions). Calculate distance (In terms of r) till then collide on other side of circular path.

[@angelobarraco2352]

Im an italian student and i learned more by this video than hours and hours of my physics prof lessons. Ty

[@DrPhysicsA]

Thanks of your kind comments. The videos are only available on KZbin. There are ways of downloading them, which ought to be quite quick, but I'm afraid I don't know the details. I am told that if you Google how to download a KZbin video you will get plenty of advice.

[@DrPhysicsA]

I'm not sure. I haven't looked at the Cambridge Board in detail. Perhaps others can comment.

[@David_Lloyd-Jones]

Confusion of cause and effect at 1:35: It is not "some turbulence in the air" which slows the ball down. The ball's arrival causes the turbulence. (If there was turbulence before the ball came along, it may very well help the ball along, although net net turbulence does tend to be dissipating energy from a region.) What slows the ball down is the resistance of the air, the F = ma of having to push it out of the way. The turbulence is then concomitant with the acceleration of the air caused by the ball.The turbulence is only then a factor in inhibiting the ball. Ball first, then turbulence. Causes precede effects. The general rule: what teachers say is very often incorrect. They often work hard at the big stuff and let the rest fall where it may.

[@heavymetaldeath4life]

Yes, you have to use the quadratic formula, but please note that there's no such thing as negative time, so you can ignore such values of t.

[@DrPhysicsA]

Yes you are right. I was using a shorthand to refer to the force that creates the gravitational acceleration g.

[@DrPhysicsA]

As Edward points out it depends what exam board you are taking. My videos try to combine all the material from the main Boards.

[@EriAirlangga]

I love the way you derive the formulas so clearly and easy to understand. Thank you!

[@DrPhysicsA]

I haven't covered any one course. I have tried to cover most of the core topics in Edexel, AQA A & Band OCR A & B, although I have not covered some of the bio-physics material.

[@DrPhysicsA]

My videos cover the courses for AQA, OCR and Edexcel and some others as well. So it should cover AQA. But not all the material will necessarily be needed for every course. They are revision videos so if there is a video for a subject which you haven't covered in your course then you probably don't need it.

[@DrPhysicsA]

Sadly I don't have any notes to put online. I produce a very rough draft outline of the video to give me a guide . But I fear it would be of no use to anyone else. But a lot of this material is also contained in AS and A2 revision guides that you can purchase.

[@DrPhysicsA]

I am most grateful and flattered. Thanks so much for the feedback. I hope they gain a fresh fascination for the subject.

[@DrPhysicsA]

The A level revision playlist is intended to cover the material in most of the courses (AQA, Edexcel, OCR and CIE except for biophysics. If there are any gaps, let me know.

[@DrPhysicsA]

Optics video is at kzbin.info/www/bejne/joPWiq1_mc2Lh6s and see also the A Level revision Playlist

[@raymondfabi1140]

DrPhysicsA ûhve

[@sarahchambers5319]

Thank you, you managed to concisely explain the fundamentals of classical mechanics with clarity, something that many other lecturers are unable to achieve. Keep up the good work, it is vastly appreciated.

[@Sfxquan1408]

I think this so called 'revision' is as good as or if not so much better than lessons in school.

[@studyunderstandteach6892]

Hey.. Check out my Slowly growingChannel for latest videos on Physics, Chemistry and Biology 😁 and please subscribe I'm gonna be uploading more videos soon

[@sheeshsama3478]

A subscribe wont hurt you this man is giving free tuition at home god bless you

[@MuhammadAwais-dm6un]

Man! U r the guy who taught so well through ur videos tht i was able to pass Alevel physics with out any other teacher! Although i got a D but i wanna say thanks!

[@mickygrann]

Dear DrPhysics, this is by far the best presentation, explanation and content I've seen online. Thank you so much for taking the time to share this knowledge!

[@DrPhysicsA]

For Simple Harmonic Motion see Simple Harmonic Motion

[@skaai]

I recall deriving my kinematic equations (with integrals and derivatives) and it was so drawn-out and painful, yet you just made it look like a child could do it with basic algebra! BRAVO sir! I will now use your derivations whenever I teach others (and credit you duly)..

[@Norsoldier87]

I got an A at my exam. tnx alot. Your video covering electromagnetism is your best one. Tnx from Norway

[@steves1015]

I just stumbled across your videos. They are brilliantly done - clear, concise and easy to understand. I am sadly a long way past my A level times but I never got the chance to study physics at that level and find your presentations interesting and informative. I’m even considering going for my Physics A level in the near future! Lol Thank you!

[@morgengabe1]

I may have said this in the past, but it would be brilliant if you could make these downloadable somehow. Like a podcast on iTunes or something. Thanks for the quality lectures!

[@DrPhysicsA]

There is a playlist called A level Physics exam questions with worked A level questions.

[@Kanatshi]

i just want to say a big thank you to what you're doing you have no idea how much you have helped me throughout my mechanics (maths A2) so far.. i love the way you broke down everything to its simplest form. i dont even bother with my teacher since her explanations confuses me. thank you once again sir

[@DrPhysicsA]

I'm not sure. I'm thinking of perhaps doing some "Practical" videos. I dont have the facilities to actually do practical examples but I could talk about what you need to do. I dont know of any online source but there may be something. Failing that you could try searching KZbin for individual practicals, eg A Level Electricity Practical to see what it comes up with.

[@phnaargos]

you're welcome. afaik uploaders can download their own videos. you could determine if the source is corrupted, or if it's a playback glitch. Even if it is the source, there's probably software that could repair it.

[@giuliamartorana8378]

I have learned so much more in this 28-minute video than I have in class for about 3 months. Thank you so much I really appreciate this, even though it was posted about 7 years ago haha. :)

[@morgengabe1]

Sir, this is probably a negligible detail, but at 17:35 you use the word "Force" when describing the Gravitational Field, or Acceleration.

[@DrPhysicsA]

Thanks. Good luck with the rest of A2.

[@DrPhysicsA]

You need to work thro your course notes. And it may help to watch my A Level revision playlist - altho this may cover more than your actual course so you might wish to miss out any material which you haven't covered in class and which isn't in your particular syllabus.

[@sasha07062011]

FINALLY found a good you tube account for physics a level which make no sense to me whatsoever. Thank you

[@beoptimistic5853]

kzbin.info/www/bejne/rHenfpR-hpmejZo .💐

[@MrPicklekvGygA]

I advise those who think the pace in which the speaker talks is slow, to speed up the video using KZbin's built in speed-changer. It is located within the settings gear. I personally find 1.5x and 1.75x a more favorable pace.

[@Hayougotnuked]

Quick question, through looking at my notes on Newton's 3rd law, if you were to stand on the ground, this would be an example of Newton's 1st law, as it is 'two separate interactions', for it to be Newton's 3rd law, the forces have to be of the same type?, Im not certain if i understood this properly, but arn't you saying that standing on the ground is an example of Newton's 3rd law, that every reaction has an equal but opposite reaction? Excuse me if i explained myself bad.. :p

[@JuliaNakale-g5y]

your videos are good but they could be even better if you could maybe add a question after every explanation . but never the less they are quite helpful

[@DrPhysicsA]

I'm not sure how to download a KZbin video. But it appears that there are mechanisms to do it. A google search seems to show several options.

[@koliko987]

I'd love it if you could do a separate video on work, energy and power, maybe basing it more on the aqa nelson thorne book. I think a lot of us would really appreciate it if you explained energy and work, how it's connected with Newton's laws in real world, how and why and in what form energy is actually lost, motive power as kinetic energy per second plus energy lost due to resistive forces per second (which really confuses me personally).

[@DrPhysicsA]

Newton's 3rd law requires that if I lean on a wall then the wall leans on me. But if I put a book on the table such that gravity pulls the book down but the table holds it up, then that is Newton's 1st law.

[@foleyrickli2567]

Fantastic online physics course bravo DrPhysics

[@jamesmac9]

Great videos man! I've neglected the use of my teachers this year and definitely havent paid enough attention in class. I've got round to revising and have found that making notes from the book just wasnt stimulating my mind and this more interactive style was just what i needed. Thankyou!

[@DrPhysicsA]

I have checked it on an ipad and it plays fine there. I wonder what the problem is.

[@1997CWR]

You just summed up my last entire year of physics...

[@DrPhysicsA]

Hi. My A level revision videos are specifically designed for A level students (aged 17-18 - 6th form) in the UK. But they cover a broad level of physics so I would hope they could be useful generally. I cant guarantee that they will cover your syllabus though. Hope it all goes well.

[@DrPhysicsA]

Thanks. I did think of using a tablet (cf Khan Academy) but I actually prefer the low-tech solution. In my opinion they somehow make the info more accessible.

[@teacherstalk419]

Beautiful sir. Its shashiraj sir from india. You are One of the best teacher and explainer I had ever seen. I request you to write minimum 4 books on physics in your style of teaching so that many students and simple thinkers of science gets benefit.. and record a separate video on your perspectives on science and teaching.. and how do you record your lessons and all..

[@nurfaezahabdullah7642]

This video helps me lots. I haven't even start studying A-level, but, watching this gives me clearer vision of what i'm gonna study later.

[@danniiemars]

Thank you so much! I'm having mid years next week and I really want to prove to my teacher that I CAN do Physics. Also, since it's the holidays, I can't really concentrate on re-reading my notes so videos are much more effective in my case haha so once again, thank you very much!

[@zintor9547]

could you make a AS Playlist, because i might learn something that is for next year. it would just be very helpful. thanks

[@DrPhysicsA]

I did think of doing that but my vids are intended to cover AQA, CIE, OCR and Edexcel syllabuses and not all have the same separation between AS and A2.

[@chrisofnottingham]

Classical mechanics is best appreciated with calculus, although I gather that in England we have managed to take it out of A level physics. Anyway, my point was that although you should know some calculus, the amount required for classical mechanics alone is very little, and really only amounts little more than understanding the terminology. It is nothing like the amount you need for mathematics as a subject, or degree level modern physics.

[@westq2]

Im doing a foundation year in Engineering your channel has been helping a lot, thank you

[@zak807]

You're the best physics teacher I have ever come across!

[@oximas]

omg you summarized the entirety of my high school physics in one video

[@nooneknow6375]

Sir, I'm so grateful to you to have such a superb lecture. Your teaching method is awesome. I understand all the areas which I don't and I memorize each and every thing. Thank you so much to have such a lecture.

[@beoptimistic5853]

kzbin.info/www/bejne/rHenfpR-hpmejZo .💐

[@mattjellis05]

Thank you so much for these videos, i'm learning more off these than i have off my teacher in the past 3 months!

[@abiralgautam1327]

Thank you sir! You are a life saver! Could you please continue to upload new videos!!

[@yatharth434]

bhai do not think he is alive anymore

[@DrPhysicsA]

Not sure where you mean, but I imagine I square the term just to show how one formulation of an equation of motion leads to another.

[@anshsaxena547]

I think it’s brilliant how well you explained everything in just about half an hour. Wish I found this last year, would have been so helpful to understand the concepts faster, still great nonetheless!

[@aarongreenemail]

you're a legend, really good teacher, would love it if you were my physics teacher you make things so clear and immediately obvious

[@DrPhysicsA]

Thanks for your very kind comments.

[@DrPhysicsA]

Can you tell me in what respect? Does it not play properly or do you think there is an error within it?

[@hyperbollics2389]

Nearly 300k subs and not making regular content.. the content wasn't for the revenue, purely a gift to the world.

[@eduardodelolmo3247]

I think that the most widespread view among physicists is that classical physics or mechanics is everything that does not include quantum mechanics. Relativity is classical mechanics.

[@jihyounnie]

your videos make more sense than my a-level teachers...Thank you!

[@havehalkow]

you can look for YTD (which stands for youtube downloader) on google, they have a free version that you can use

[@DrPhysicsA]

I am delighted. Thanks.

[@tylarex]

Hi, I've only just started my GCSE's, but have a general interest in mechanics and have read a few books on quantum mechanics and other interesting theories for the general reader, but I found this extremely helpful and informative, thanks!

[@DrPhysicsA]

Thanks. I have just started making a series of videos specifically designed for GCSE revision.

[@morgengabe1]

Course content varies from place to place. You should probably contact the facility administering the course for specific details.

[@billyshakes-t9g]

My only concern is that technically "s" is "delta-s", and this derivation assumes initial position is zero. Aside from that, this is very useful. Thank you for generating some of the most valuable physics content on KZbin.