Personally, I would have preferred if there wasn't the background music. However, it was still a great video so thank you very much!
@zhelyo_physics4 жыл бұрын
Interesting! I was actually wondering recently about that! I'll experiment with no background with the next one and see the result. Thanks for the comment!
@arctichoundgamer21054 жыл бұрын
@@zhelyo_physics No problem :) maybe just making it a tad quieter would work too, I’ll watch them either way!
@Wartix019 ай бұрын
Grateful for all your lessons. Was really stressed because I couldn’t understand these topics. But you made them much easier to understand
@zhelyo_physics9 ай бұрын
Wow, thank you so much for your comment!
@major8409 Жыл бұрын
11:38 music decided to go hard for a moment 😂
@TaibaRaza-k3d Жыл бұрын
I’m so grateful for these video. I have A levels in about two days. Really covered all me revision. Thank you.
@zhelyo_physics Жыл бұрын
thanks a lot for the comment! Good luck!
@OmarAntar-er3kl5 ай бұрын
My head will blow up 💥
@anonymous99923 Жыл бұрын
For the last question, does that mean 10cos(33) + 7.1cos(50) = 15 as the total momentum in the x direction before = total momentum in x direction after? But total momentum before is 15 Nm and total momentum after is 12.95 Nm? Where have I gone wrong?
@zhelyo_physics Жыл бұрын
This would be correct, I made up the example to showcase the method. I think the input angle of 50 in the question is wrong. The method you describe would be absolutely correct!
@aakashs54208 ай бұрын
i want you to solve using components of velocity in x direction
@fariataxnim2 жыл бұрын
shouldnt it be 0=10sin33 - vsin50 because the two momentum in different direction?
@zhelyo_physics2 жыл бұрын
if added up they should give 0, you can write it as +vsin50 but when you solve for v this would give a negative answer. Hope this is helpful!
@nikolayyordanov89862 жыл бұрын
Hello Sir, in an exam question would we be asked to find the momentum in the vertical or horizontal direction for 2D momentum, or do we have to know which one they're looking for? It confuses me how you know which one you have to find. Thank you!
@zhelyo_physics2 жыл бұрын
Hello, you can normally find a problem using both. I tend to just go for the easier way. E.g. if the total momentum in the y direction is 0 initially, use the y momentum after as they will add up to 0. Hope this helps! : )
@nikolayyordanov89862 жыл бұрын
@@zhelyo_physics Thank you!
@iSuperMC2 жыл бұрын
but why do you get a different solution for v when you resolve in the x axis ( 15 = 10cos(33)+vcos(50) ) because the answer you get that way is v = 10.29
@zhelyo_physics2 жыл бұрын
interesting, I'll investigate that!
@indiantechsupport5462 жыл бұрын
@@zhelyo_physics I think your angle 50 is wrong. I got it to be an angle of about 39.5 (39.47322373) degrees. If you use that, you get a velocity of about 8.6ms-2 (8.567311691) for v. Keep up the great work :)
@zhelyo_physics2 жыл бұрын
@@indiantechsupport546 I think you are absolutely right! I actually remember just coming up with an example to showcase the method. Thanks!
@persowa8940 Жыл бұрын
Thanks bro I thought I was going insane cuz I had the wrong solution turns out I was right all along
@sh_legendsh_legend6754 Жыл бұрын
About momentum in 2d you only found rebound speed via equation momentum y before= momentum y after. When would you use momentum x before= momentum x after. Or can you do either to find rebound speed? Not sure how you would find the rebound speed by using momentum x equation if if you can use either equation.
@zhelyo_physics Жыл бұрын
Funny I have just published a brand new video on this topic. Hope this helps!
@rajvardhanpatankar354710 ай бұрын
Hi I had question on the momentum in 2d example as when I did it with momentum in the x axis i got a different value for v my calculation was mVcos(50)+m10cos(33)=15. Sir can you explain where I went wrong
@zhelyo_physics10 ай бұрын
Hi, have a look at the previous comments where I have answered this in detail. So when I made this question years ago the angles should have added up to 90 degrees which leads to inconsistency in x and y answers. Your calculations are okay! : ) Good work!
@PavanYK Жыл бұрын
For the momentum in 2d question, why would you look at the vertical component rather than the horizontal component; would it matter?
@zhelyo_physics Жыл бұрын
Nope it will not (please note that there is an inaccuracy in this question though which I mention in other comments which leads in difference in answers)
@stelsie9226 күн бұрын
this was beautiful cheers
@zhelyo_physics6 күн бұрын
thank you for the comment!
@story.shifters Жыл бұрын
Very useful lessons! Thank you so much! May you, please, post your notes? (whole screens of lessons) It would make our life much more easier ;) Thaaanks!!!
@zhelyo_physics Жыл бұрын
Thanks for the comment! Sorry only the videos are available. Glad they are useful though! : )
@devakp88322 жыл бұрын
If you use the x component would you get the same velocities?
@zhelyo_physics2 жыл бұрын
actually not in these case due to the initial conditions, the principle is the same though. I will make a further video addressing this.
@justblitz15667 ай бұрын
For the last question, woulndt the momentum before be 15? Since MaUa + MbUb gives 15 + 0? With that im getting v as 12.47 m/s
@justblitz15667 ай бұрын
Sorry I just saw the clarification in the other comments, thanks for the amazing video though!
@zhelyo_physics7 ай бұрын
thank you for the comment!
@aaronkibs83536 ай бұрын
Thanks for the video. For the last question why is mvsin50 defined as positive rather than negative, as you know the velocity is travelling down .
@zhelyo_physics6 ай бұрын
excellent question, it is not defined as positive per say, but when you do the algebra it comes out as negative, essentially both y components need to add up to 0. Hope this helps!
@Aakash-yy4jf5 ай бұрын
i think you have made a mistake in momentum in 2d collision. when using momentum in y direction the momentum after the collision in y direction of the other ball is in opposite direction so you have to include the negative sign...btw great video
@benjaminfox3761 Жыл бұрын
Hi Sir. I was doing an exam question that asked about working out the change in momentum after an object rebounds off of a wall, and it was -2mv. Do you happen to have a video explaining how you get this? Thank you for all your videos btw, they are an absolute lifesaver!
@zhelyo_physics Жыл бұрын
I do have an old video on this actually: kzbin.info/www/bejne/pKjYepaqiryirdk enjoy!
@benjaminfox3761 Жыл бұрын
@@zhelyo_physics brilliant thanks you!
@teacupcakes2739 Жыл бұрын
i literally learnt this in fmaths today. since change in momentum = mv - mu you know mv = -mu since it rebounds at same speed. So momentum = -mu -mu = -2mu
@kausarlolz6 ай бұрын
hello sir, if i wanted to find the area under a non linear curve. do i find the area of one box and multiply it by the total number of boxes? what if we have some incomplete boxes like a quarter box in the area or a half box?
@zhelyo_physics6 ай бұрын
I think it's a question of approximating in that case. Typically the answers are not exact in those types of questions.
@Azeem81662 ай бұрын
Hi sir how do tou know to use the horizontal instead of the vertical for the sohcahtoa
@zhelyo_physics2 ай бұрын
A good way of thinking of is the total momentum in the y direction was 0 before, so it will be 0 after which makes the calculations easier. Hope this helps
@m4rzb4rz-qq3yq7 ай бұрын
2x speed bgm isnt the best sound in the world 😅
@As-iy2ki Жыл бұрын
At 16:36 why is it sin instead of cos? I thought the vertical components cancel out so we use cos. Correct me if I am wrong.
@zhelyo_physics Жыл бұрын
You can do these problems with either sin or cos, if the vertical components cancel out you can directly set them equal to one another. Hope this helps!
@abdi53837 ай бұрын
was wondering if you had the midmaps that you create in a colection
@zhelyo_physics7 ай бұрын
thanks for the comment, sorry only the videos are available.
@teacupcakes2739 Жыл бұрын
I like the silly music in the background
@S_H-R Жыл бұрын
Very helpful sir
@zhelyo_physics Жыл бұрын
thank you so much!
@uncloned69 Жыл бұрын
why is the momentum before zero? 16:19 explain a bit more to understand pls
@zhelyo_physics Жыл бұрын
As there is no motion in that direction
@clevereagle191110 ай бұрын
Does it work for international Alevels Edexcel ?
@zhelyo_physics10 ай бұрын
Yes
@tayyibjamil8573 Жыл бұрын
Hi is momentum in 2d covered in the AS spec for AQA physics
@zhelyo_physics Жыл бұрын
I can't remember off the top of my head sorry but a quick Google of the spec will give you an answer and even better you can use it as a check list. Good luck!
@pratyasha2797 ай бұрын
3:15 How is R electrostatic in nature in this example?
@zhelyo_physics7 ай бұрын
so the any surface is made out of electrons that cannot occupy the same space at the same time. Hope this helps!
@asyadallykhankhodabocus6278 Жыл бұрын
No music again plss
@zhelyo_physics Жыл бұрын
Definitely, this was amongst my first batch of videos. There has been no music since 2020 : )
@lukienure50075 ай бұрын
Hi sir , is this aqa ?
@zhelyo_physics5 ай бұрын
applicable to AQA but for all exam boards, the last part on 2d Momentum is not part of the AQA spec, but worth double checking.
@indiraflo67702 жыл бұрын
Thank you
@zhelyo_physics2 жыл бұрын
Anytime! : )
@enderman4514 Жыл бұрын
youre awesome ❤
@zhelyo_physics Жыл бұрын
thanks a lot for the kind comment!
@gautammorkhandikar394 Жыл бұрын
how do you identify that a question will use newtons laws?
@gautammorkhandikar394 Жыл бұрын
the shower head question is a bit confusing when you first see it
@zhelyo_physics Жыл бұрын
anytime when there is acceleration. If the mass is constant, you can use F=ma, if not e.g. a fluid flow, the rate of change of momentum as described : )
@dureadan-p9k Жыл бұрын
M¹v¹ = m²v² M¹v¹ +m²v²= m²v¹ + m²v² Big confusion in thisss in which cases we will apply them Or maybe the second formula doesnt even exist😅 im very bad at phy
@zhelyo_physics Жыл бұрын
Depends on the initial velocity of the objects, we are always just conserving mass x velocity for each object. Hope this helps!
@nadiab7747Ай бұрын
cant watch the vidoe with thaat music
@zhelyo_physicsАй бұрын
I agree, this is one of my first videos from years ago