A Level Physics Revision: All of Newton's Laws, Impulse and Momentum

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ZPhysics

ZPhysics

Күн бұрын

Пікірлер: 83
@Wartix01
@Wartix01 10 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_physics
@zhelyo_physics 10 ай бұрын
Wow, thank you so much for your comment!
@arctichoundgamer2105
@arctichoundgamer2105 4 жыл бұрын
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_physics
@zhelyo_physics 4 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!
@arctichoundgamer2105
@arctichoundgamer2105 4 жыл бұрын
@@zhelyo_physics No problem :) maybe just making it a tad quieter would work too, I’ll watch them either way!
@TaibaRaza-k3d
@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
@zhelyo_physics Жыл бұрын
thanks a lot for the comment! Good luck!
@OmarAntar-er3kl
@OmarAntar-er3kl 6 ай бұрын
My head will blow up 💥
@major8409
@major8409 Жыл бұрын
11:38 music decided to go hard for a moment 😂
@aakashs5420
@aakashs5420 9 ай бұрын
i want you to solve using components of velocity in x direction
@Aksa-y8y
@Aksa-y8y Күн бұрын
For the momentum question on 18:00, I tried getting my answer using horizontal components but didn't get the same answer. I assumed that the second object was stationary and used the equation M(a)V(a) + M(b)V(b) = M(a)V(a') + M(b)V(b'), which gave me ((1)(15)+(1)(0) = (1)(10cos(33)) + (1)(vcos(50)), why or how would this method be wrong??
@zhelyo_physics
@zhelyo_physics Күн бұрын
Hi, I think I covered this in some of the older comments but I think set up the problem wrong with the initial angles. Typically your method would work though.
@anonymous99923
@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
@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!
@rajvardhanpatankar3547
@rajvardhanpatankar3547 11 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_physics
@zhelyo_physics 11 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!
@stelsie922
@stelsie922 Ай бұрын
this was beautiful cheers
@zhelyo_physics
@zhelyo_physics Ай бұрын
thank you for the comment!
@story.shifters
@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
@zhelyo_physics Жыл бұрын
Thanks for the comment! Sorry only the videos are available. Glad they are useful though! : )
@nikolayyordanov8986
@nikolayyordanov8986 2 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_physics
@zhelyo_physics 2 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! : )
@nikolayyordanov8986
@nikolayyordanov8986 2 жыл бұрын
@@zhelyo_physics Thank you!
@sh_legendsh_legend6754
@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
@zhelyo_physics Жыл бұрын
Funny I have just published a brand new video on this topic. Hope this helps!
@fariataxnim
@fariataxnim 2 жыл бұрын
shouldnt it be 0=10sin33 - vsin50 because the two momentum in different direction?
@zhelyo_physics
@zhelyo_physics 2 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!
@As-iy2ki
@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
@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!
@PavanYK
@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
@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)
@pratyasha279
@pratyasha279 8 ай бұрын
3:15 How is R electrostatic in nature in this example?
@zhelyo_physics
@zhelyo_physics 8 ай бұрын
so the any surface is made out of electrons that cannot occupy the same space at the same time. Hope this helps!
@AmL-L-L
@AmL-L-L 20 күн бұрын
random question but is there a brief explanation as to why R (reaction force) is electrostatic?
@zhelyo_physics
@zhelyo_physics 16 күн бұрын
a good analogy (warning just an analogy) is that it works a bit like a trampoline, you push down, displacing electrons and changing their balance point, pushing back up. Hope this helps!
@Aakash-yy4jf
@Aakash-yy4jf 6 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
@aaronkibs8353
@aaronkibs8353 7 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_physics
@zhelyo_physics 7 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!
@uncloned69
@uncloned69 Жыл бұрын
why is the momentum before zero? 16:19 explain a bit more to understand pls
@zhelyo_physics
@zhelyo_physics Жыл бұрын
As there is no motion in that direction
@iSuperMC
@iSuperMC 2 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_physics
@zhelyo_physics 2 жыл бұрын
interesting, I'll investigate that!
@indiantechsupport546
@indiantechsupport546 2 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_physics
@zhelyo_physics 2 жыл бұрын
@@indiantechsupport546 I think you are absolutely right! I actually remember just coming up with an example to showcase the method. Thanks!
@persowa8940
@persowa8940 Жыл бұрын
Thanks bro I thought I was going insane cuz I had the wrong solution turns out I was right all along
@devakp8832
@devakp8832 2 жыл бұрын
If you use the x component would you get the same velocities?
@zhelyo_physics
@zhelyo_physics 2 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.
@Azeem8166
@Azeem8166 3 ай бұрын
Hi sir how do tou know to use the horizontal instead of the vertical for the sohcahtoa
@zhelyo_physics
@zhelyo_physics 3 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
@abdi5383
@abdi5383 8 ай бұрын
was wondering if you had the midmaps that you create in a colection
@zhelyo_physics
@zhelyo_physics 8 ай бұрын
thanks for the comment, sorry only the videos are available.
@kausarlolz
@kausarlolz 7 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_physics
@zhelyo_physics 7 ай бұрын
I think it's a question of approximating in that case. Typically the answers are not exact in those types of questions.
@benjaminfox3761
@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
@zhelyo_physics Жыл бұрын
I do have an old video on this actually: kzbin.info/www/bejne/pKjYepaqiryirdk enjoy!
@benjaminfox3761
@benjaminfox3761 Жыл бұрын
@@zhelyo_physics brilliant thanks you!
@teacupcakes2739
@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
@justblitz1566
@justblitz1566 8 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
@justblitz1566
@justblitz1566 8 ай бұрын
Sorry I just saw the clarification in the other comments, thanks for the amazing video though!
@zhelyo_physics
@zhelyo_physics 8 ай бұрын
thank you for the comment!
@enderman4514
@enderman4514 Жыл бұрын
youre awesome ❤
@zhelyo_physics
@zhelyo_physics Жыл бұрын
thanks a lot for the kind comment!
@S_H-R
@S_H-R Жыл бұрын
Very helpful sir
@zhelyo_physics
@zhelyo_physics Жыл бұрын
thank you so much!
@tayyibjamil8573
@tayyibjamil8573 Жыл бұрын
Hi is momentum in 2d covered in the AS spec for AQA physics
@zhelyo_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!
@clevereagle1911
@clevereagle1911 11 ай бұрын
Does it work for international Alevels Edexcel ?
@zhelyo_physics
@zhelyo_physics 11 ай бұрын
Yes
@teacupcakes2739
@teacupcakes2739 Жыл бұрын
I like the silly music in the background
@indiraflo6770
@indiraflo6770 2 жыл бұрын
Thank you
@zhelyo_physics
@zhelyo_physics 2 жыл бұрын
Anytime! : )
@m4rzb4rz-qq3yq
@m4rzb4rz-qq3yq 8 ай бұрын
2x speed bgm isnt the best sound in the world 😅
@lukienure5007
@lukienure5007 6 ай бұрын
Hi sir , is this aqa ?
@zhelyo_physics
@zhelyo_physics 6 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.
@gautammorkhandikar394
@gautammorkhandikar394 Жыл бұрын
how do you identify that a question will use newtons laws?
@gautammorkhandikar394
@gautammorkhandikar394 Жыл бұрын
the shower head question is a bit confusing when you first see it
@zhelyo_physics
@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
@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
@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!
@asyadallykhankhodabocus6278
@asyadallykhankhodabocus6278 Жыл бұрын
No music again plss
@zhelyo_physics
@zhelyo_physics Жыл бұрын
Definitely, this was amongst my first batch of videos. There has been no music since 2020 : )
@nadiab7747
@nadiab7747 2 ай бұрын
cant watch the vidoe with thaat music
@zhelyo_physics
@zhelyo_physics 2 ай бұрын
I agree, this is one of my first videos from years ago
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