A Level Physics Revision: All of Forces | Moments, Torque, Centre of Gravity, Archimedes Principle

[@bimboodekunle4296]

Revising for Year, 13 mocks. These videos are amazing. Yes I'm revising on Christmas😭😖

[@zhelyo_physics]

Merry Christmas! Good luck revising and also don't forget to take a break!

[@bimboodekunle4296]

Back to this video 3 days before the exam 😁

[@ocelot9643]

@@bimboodekunle4296 1 day before exam!

[@Anyting9OnTopGrrr]

How did they go

[@gracesolar4850]

Will be me this christmas 😢

[@mrpierat101]

AMAZING PUNS SO LETS TAKE A MOMENT TO APPRECIATE THEM!

[@zhelyo_physics]

Haha thanks 😀

[@wherestheexit7231]

You just taught me in 10 minutes what my teacher couldn't explain in 6 months 👍

[@ehruuuu_]

Your videos are proving to be really helpful. Thanks for all the videos!!

[@zhelyo_physics]

anytime, thanks for the comment!

[@3rddegreeburn930]

Your amazing you know.Thank you so much for helping me through my A levels.

[@zhelyo_physics]

Glad to hear the content is useful! Thanks a lot for the comment! : )

[@iluvdawgs00]

so wut was yo grade

[@kaikenxl6800]

Revising for Physics paper 1. Thank you for the videos

[@zhelyo_physics]

Anytime! Good luck revising!

[@kaikenxl6800]

@@zhelyo_physics Thanks again

[@sp1r1t59]

@@kaikenxl6800 did these videos really help you for physics paper 1??????

[@aymanahmed1720]

Damn z physics coming in clutch

[@dnishal]

got progression exams coming in exactly a month, i didnt have a good teacher, infact my college changed their teacher 3 times since we first started year 1 in last september. my works been all over the place since our first teacher skipped all the way to module 4 in ocr spec A, when we first layed our eyes on physics. and the other 2 were trying to fill that gap but are restricted by time left due to exams in a month. revisions been hard, these teachers were rude and made me hate physics. but i need to lock in for next months exams, im tryna flip it from Getting D's to try get a B or an A. your videos i think will save my exams, thank you so much Zphysics, i cant even describe how much these videos you made covering every topic will help me!

[@zhelyo_physics]

Thank you so much for the kind comment and taking the time to write it. It really means a lot to read it and comments such as these genuinely make my day. Let me know if any bits of the videos don't make sense and I'd gladly explain them if needed. Good luck revising!

[@dnishal]

@@zhelyo_physics Thank you so much, this honestly means the world to me!, ill make sure to ask any questions on the comment section on that specific video ❤❤❤❤

[@ahnafrafedahsan929]

Video for Chapter 4: Force, Density and Pressure

[@oskarwitha_k8258]

could you please make a video going through projectile motion and also another video going through all of a level ocr a equation booklet if you have any spare time please (i am confused why we need certain mathematical equations like arc length and logs)? thank you in advance!

[@zhelyo_physics]

no probs! projectile motion is here: kzbin.info/www/bejne/jYO6d6OPmqqHfq8 The equation sheet is a great idea! In the meantime I've covered all the maths here: kzbin.info/www/bejne/pJaloKedmZeDgaM

[@oskarwitha_k8258]

@@zhelyo_physics thank you!!

[@Leaky44]

I do not understand how the Drag Force is 0. I think i got a bit lost, could anyone help me.

[@zhelyo_physics]

so just before an object starts falling its speed is 0, therefore the drag is zero. As the object falls, it's speed increases and hence its drag increases. Hope this is useful!

[@snxwy_]

Hi at 28:50 I worked it out by resolving the vertical component of tension and then x by 0.2 and it worked should I carry on doing it this way or is there an issue with it?

[@zhelyo_physics]

you can absolutely do it this way : )

[@toriiramlall6638]

This video really helped me, thank you so much

[@zhelyo_physics]

Glad it helped! Anytime!

[@thevinecompany7733]

Hi i just saw a multiple choice question where it said when a ball is hit upwards and is at maximum height, its acceleration is acting downwards. I thought as there is no net force at max height there would be no acceleration no? Please explain. Thanks!

[@zhelyo_physics]

At max height gravity is still pulling it down, hence there is a force. In fact if you throw something up in the absence of drag the net force will remain constant (mg) at all points. Hope this helps!

[@thevinecompany7733]

@@zhelyo_physics ahh that makes a lot of sense, thanks so much!

[@karmajade7536]

Hello, I noticed you wrote in your channel description that you teach computer science too. Would it be possible to make videos for A level computer science?

[@zhelyo_physics]

Maybe, I am considering starting a separate CS channel but it is very time dependent. I have one on here on binary you will be able to find.

[@PrathinavRaghavendar]

Excellent video….Thank you so much!!!

[@zhelyo_physics]

anytime! thanks for the comment!

[@alizaaqil9899]

This is seriously soo helpful cant thank you enough! I have past papers i cant solve. I was wondering if you could help me in any way?

[@zhelyo_physics]

thanks a lot for the comment! Much appreciated. Sure, drop some specific questions and I will see what I can do. If you are doing OCR, if you have a browse I have solved many of the past papers on here.

[@alizaaqil9899]

@@zhelyo_physics Alright! Is it okay if I email them? Thank you soo much though

[@lemonke7744]

thank you sooo much

[@zhelyo_physics]

anytime! thanks for the comment!

[@dontpissonmee]

26:37 i couldnt understand what you did so i just split it into components and did the verti force x distance, simpler imo

[@jtj3112]

in the non perpendicular moment question, can we take the vertical component of T and multiply it by 0.2 (5cos60*0.2)? would this be any different from you have done?

[@zhelyo_physics]

absolutely okay method! : )

[@kausarlolz]

hi sir, how do we know that drag force is proportional to velocity^2?

[@zhelyo_physics]

it is typically derived from experiments

[@thepreacher621]

28:00 for this question could you use the horizontal component of the tension so 5sin30 x 0.2

[@zhelyo_physics]

yep! You can totally do it in terms of forces, I think you mean the vertical component though.

[@zion9146]

hi z physics im confused about practicals i always thought we need to know all the 'PAGS' but the spec says they are example practicals than can assess skills. do you have a list or do you know all the practicals we need to know for a level physics ocr a

[@zhelyo_physics]

Excellent point, most of the pracs would not come up word for word. They are teacher/student guidance therefore we need to understand the principles behind them. Some of the materials including practicals will be "novel" new situations in which there would be a practical that students have likely not seen before. Don't worry though - they will all be completely solveable with existing knowledge of physics. I have an experiment playlist of most of the common ones: kzbin.info/aero/PLSygKZqfTjPDgdq6nvUV29YBSsAuPisBp

[@zion9146]

@@zhelyo_physics thank u

[@TDuncPiano]

13:08 why is drag proportional to v^2? How to you derive that from equations?

[@zhelyo_physics]

it's beyond the course. I think it was first discovered as an experimental law.

[@TDuncPiano]

@@zhelyo_physics oh okay :) thank you!

[@alikazaidi7244]

Amazing

[@zhelyo_physics]

Glad this is useful! Thanks a lot for the comment!

[@azmanfaruqui2861]

Awesome ❤️

[@zhelyo_physics]

Thanks a lot for your comment! Much appreciated!

[@H1289-h8o]

Great video

[@zhelyo_physics]

Thanks a lot!

[@suudoakira]

is archimedes principle relevant for aqa?

[@zhelyo_physics]

Hi, nope, I always recommend keeping an eye on the spec and using it as a checklist. Good luck revising!

[@suudoakira]

@@zhelyo_physics thank you! all your videos are so helpful!

[@m4rzb4rz-qq3yq]

At 19:07 the 'plane' is referring to the slope, right?

[@zhelyo_physics]

absolutely, hope this helps

[@inayat1910]

1000th like😁😁😁

[@zhelyo_physics]

🥳

[@luddy20]

does the distance have to be perpendicular to the pivot or the force?

[@zhelyo_physics]

yep it's the perpendicular distance from the pivot to the line of action of the force.

[@3rddegreeburn930]

Hello there! is there a video on forces Qs because i can't seem to find it in the play list?

[@zhelyo_physics]

Not yet but working on it : )

[@luddy20]

why is the acceleration increasing at 14:30 if the drag force and speeds increasing? isn't force proportional to acceleration

[@zhelyo_physics]

the acceleration is decreasing however the speed is increasing. Hope this helps!

[@luddy20]

@@zhelyo_physics sorry but why? im a bit confused on why that is sir!

[@studyrain-ne3ur]

​@@luddy20 acceleration depends on the net force, as soon as the forces acting on either ends of the object is not equal, the body accelerates. Here, as the body is falling down, initially it has an acceleration of g which is 9.81 ms^-2 (Here the backward force is 0) . As it falls, resistive forces ( Air resistance ) acts upon it, the backward force (drag force) starts to increase, and as the drag force increases, acceleration decreases. Take for example this equation Net Force = mass x acceleration Forward Force - Backward Force = mass x acceleration Forward force is the weight of the object Backward force is the Drag force Mass is constant so as value of backward force increases the net force decreases so the acceleration decreases. A point will come where the drag force will equalize the weight (Terminal Velocity) Here the object is still falling but with no acceleration but at a constant velocity hope this helps

[@talharizwan9917]

Sir this video can help me for gcse physics?

[@zhelyo_physics]

It goes well beyond your GCSEs and you would definitely ace the forces section if you understand this : )

[@halalbro911]

Oscar 🫡

[@zhelyo_physics]

haha thanks!

[@JoNaa-y5c]

I still DONt get it since English is nit my frist language

[@zhelyo_physics]

ah, I've gone through the same process. It gets better with time you got this! Let me know if I can explain something better.