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.
: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
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.
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 :)
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.
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.
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
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
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.
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
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.
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.....
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.
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.
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
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.
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.
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!
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.
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).
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
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.
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!
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.
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!
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.
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.
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)..
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
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.
It has done the same for me. It didn't used to do that. There must be some fault on RU-vid. 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.
I advise those who think the pace in which the speaker talks is slow, to speed up the video using RU-vid's built in speed-changer. It is located within the settings gear. I personally find 1.5x and 1.75x a more favorable pace.
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)
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.
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..
great vid; well explained, with a neat and very organised structure that really helps. thanks a lot. I'm hooked...gonna watch them all! Big thumbs up to you, sir!
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.
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!
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
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!
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.
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!
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. :)
Only after going through your videos did i manage to understand and start learning in proper way. Years of reading were almost nothing compared to few months on your channel which gave me completely new perspective. Thank you very much.
When you successfully derived the equation of calculating the work done I was like:"Damn, how come my teacher didn't taught me this shit". I apologize for the swearing, it was just too awesome for me to handle.
Without your videos, i doubt i would've got a pass in GCSE physics, but thanks to you, i got an A overall at GCSE, and a D at AS level (but that's because i didn't realise you did A level vids). Thank you for all you have done
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!
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 RU-vid.
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.
Good rhythm -- clear -- natural -- also civilised / pleasant/ sympathetic / not pedantic/ benign -- good-humoured -- not 'ingratiating' -- not 'twee' -- just as we would expect if Newton was giving the lecture.
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.
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.
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.
