[Physics] - Dynamics Problem | Friction | Force | Newton Law |

Thank you for the support! If you have any question and would like to contact me, please email me at [e-mail]

[@David-dt9xi]

For someone of 94 years old, I still feel like I'm learning from an active middle age teacher. The grit and passion is amazing.

[@ycmathematicsphysicsandche5659]

Kind words. Thank you

[@justsaadunoyeah1234]

​@@ycmathematicsphysicsandche5659Thank you for not dying sir 😊

[@user-gb3tq5fj7t]

First to see the new masterpiece

[@alex_ramjiawan]

Nope my dude, but hey, we can both enjoy the masterpiece nonetheless.

[@user-gb3tq5fj7t]

Surely, it’s an honor to watch him solve physic problems

[@alex_ramjiawan]

​@@user-gb3tq5fj7t Indeed.

[@diego1546]

The fact that bro posted this before the AP 1 Exam is so clutch

[@Prismate]

Translation: “The fact that he posted this right before the AP 1 exam is so handy and well-timed” Older folks aren’t quite as fond of modern lingo as us

[@Wndnb]

Student from Germany here, thank you very much for your videos 👍

[@nodocram]

This teacher is so heartwarming to listen to ❤

[@sreser111]

You are so fun to watch. I learn with it very well.

[@Mau365PP]

My man getting thumbnails and everything. Great! 🤘

[@flaviosamuelamorimterra9493]

I'm not an English speaker, but I can understand everything, that's fascinating. thank you teacher!

[@UbarryYT]

Thanks a lot , what a coincidence?! I have it in my final exams 😁🙏 my respect sir

[@Meteor2046]

Can't attend your class in Toronto, but we're happy to learn remotely

[@duckyoutube6318]

Clear and concise. Thank you for free education sir!

[@yote3929]

Thank you for helping me with math

[@Urazova17]

Thank you for the consistency!!

[@04ec]

Thank you, this helped a lot!

[@cassandranicole4248]

Thank you!

[@thesnackbandit]

Thank you so much! An absolute pleasure to watch.

[@cosmiccosmo8128]

Thanks for another video!

[@elizae7824]

Made perfect sense thank you!

[@xinzhouping]

very understandable, thank you.

[@lalverdakaraoglu]

this is wonderful!

[@NaturallyChic02]

This was so helpful!! Thank you for sharing!! ❤

[@venkatify]

thank you, sir

[@Casper-tv3rn]

thank you for the lesson teacher!

[@Shunicu]

Thank you for the new video

[@eduardopolletini8726]

Amazing ❤

[@genedong5323]

Thank you for your contribution

[@Elizabethdefranc]

Great teacher! Need more like you❤

[@chlomoney431]

thank you for this, really appreciate you ❤

[@bakwertgeek2544]

The best teacher is back at it again

[@juancarlossanchezveana1812]

Excellent. Thanks 👍

[@ita.p]

Such a clear explanation! Thank you 🙌

[@alicat6934]

Thank goodness this video exists!!! So much more helpful than my teacher 🥹🥹

[@chansonida]

You made this so much easier to understand. Thank you so much!!

[@vkp2211]

wake up bro new YC Mathematics, Physics and Chemistry just dropped

[@pankajgarg6610]

That is the goodness of youtube, you can promote great people worldwide. Thanks a lot @blackpenredpen

[@ayeshamajid2169]

Thank you kind Sir for all of your hard work 🙏 Myself as a student, along with many others appreciate it. Keep going!

[@whisperingocean.]

Very helpful, thank you

[@user-lo3ie4pe2v]

Student of around the world here. Thank you sir

[@ayushmansinha9764]

Awesome sir

[@CHARGING.TARTARUS]

Yesssss i love you dr Feng ❤❤❤❤❤

[@RedHat2003]

Thank u professor ❤

[@kevindownes2663]

Sir, you are amazing. NEVER stop doing these wonderful videos.

[@melissahong6790]

Thank you Professor! You are inspiring me to keep perusing my passions! ❤

[@boinkano]

Hello Professor!! I just wanted to say that I really love your way of teaching :) You explains things great haha, great video!

[@samanthadiaz-ck5vs]

Very detailed, helped a lot with my studies! Thank you!

[@corrina3024]

Good afternoon, Professor! Ready to learn

[@observerobserving2199]

You’re an amazing teacher

[@fedterotten]

You are an excellent teacher

[@astrotei2647]

❤❤❤❤ this helped a lot!

[@gioelefumagalli9433]

Keep going prof.!

[@ankitsarkar652]

Thank u sir . I genuinely appreciate ur efforts in clearning our concept .

[@everest1338]

Thank you for your very interessant videos❤

[@merryelm5769]

You're amazing this is so helpful and well explained 👏🏻❤

[@jeanellematias9342]

thank you!!!! ❤❤❤

[@user-pz7dx8ug4f]

Keep it up thanks for teaching us

[@hamdaesam5364]

We love you!

[@OwlHasLigma]

awesome teacher🔥🔥

[@rakshyachhetri7805]

Thank you for teaching us 🩷🩷 it helps so much

[@khushsachdeva]

I was just doing this same question in the morning and now he uploaded on the same concept!

[@nikolmi5190]

Thank you so much for this lesson it really helped❤️❤️

[@Ayevquie569]

This was brilliant sir !!!

[@constanzacenturioncolman8194]

Thanks teacher! This lesson was amazing to refresh my mind about dynamics! 😊

[@sylphy1702]

thank you for teaching physics too you're amazing 🙏🙏💯

[@Faruk44773]

Thank you

[@vivienvelasco580]

Thank you for teaching!!! We appreciate you so muchh ❤️❤️❤️

[@cabdixasan9883]

You refreshed my memory thanks teacher

[@tankulator5042]

31:32 Yes you can have a negative velocity! You cannot have a negative speed

[@lukecheung3599]

i think he meant when using v^2=u^2+2as, only consider the principal value, no need to add+/-in front of the square root.

[@tankulator5042]

@@lukecheung3599 If the question asks for the final speed, then yes, you only take the positive value. If the question asks for the final velocity, then you do need to insert the minus sign by hand to indicate that the object is moving downwards, \vec{v} = -v \hat{y}

[@fei9253]

This makes me want to go back in time and go to school for math!! I wish I knew about these videos when I was taking my math classes.

[@ctrlaltuha]

The best teacher 🔥🔥🔥 I understood everything even though I'm not that good in STEM

[@uhitt678]

He is so good at teaching that i could probably graduate just by watching his video

[@ycmathematicsphysicsandche5659]

Very grateful to read your comment

[@tung5564]

thanks for this 😋

[@pipercheng]

King!!!!

[@miazhen9840]

thank you youre very helpful ❤❤

[@lyra4816]

Very good and useful

[@KIXEMITNOG]

Interesting

[@chengedward1954]

This is amazing! Thank you!

[@ycmathematicsphysicsandche5659]

Thank You!

[@aadithc4389]

You are an inspiration and an amazing teacher! Thank you so much!!

[@ycmathematicsphysicsandche5659]

Thank you very much

[@Egchilton]

I really appreciate the way you explain these topics, professor! Thank you for the video

[@ycmathematicsphysicsandche5659]

Thank you for your kind comment

[@lapapucuenta559]

You have all the respect in the world, i love how much you love teaching, i hope you get all the good in the life because you deserve it and hope you have a good health

[@ycmathematicsphysicsandche5659]

Thank you very very much

[@d4rkgriff1n3]

Thank you for the amazing video, Mr. Feng. From Brazil, with love.

[@ycmathematicsphysicsandche5659]

Thank you

[@alx76]

Thank you for the video! I'm a law student and know absolutely no physics but nonetheless educative to watch

[@so10_]

here learning for my physics class next year 🙏🏽

[@S64C]

Have you figure out who is blackpenredpen?

[@ycmathematicsphysicsandche5659]

No, I have not figured out who blackpenredpen is.

[@dtnicholls1]

​@@ycmathematicsphysicsandche5659kzbin.info/www/bejne/n2qbqWWJr8qLm8ksi=WWbXCYoF4RLu4RtC He's why many of us are here...

[@S64C]

@@ycmathematicsphysicsandche5659 He is a cool guy living on planet Earth:)

[@Redwan_Ali]

Why tho?

[@Cheesielife]

You are a good teacher I wish I found your channel earlier 😊

[@user-pz7dx8ug4f]

this is my first time seeing physics eqaution learning

[@qkthr.ep3]

nice

[@viwong5408]

Thank you for teaching!!

[@ycmathematicsphysicsandche5659]

Thank you for your kindness

[@Ratking45557]

The goat🐐

[@isabelsudan1065]

Amazing content!!!

[@ycmathematicsphysicsandche5659]

Thank you

[@Oatmilk123]

Awesome

[@ycmathematicsphysicsandche5659]

Thanks

[@barryallen735]

We love you ❤❤❤

[@aymantimjicht173]

we can See the equation nu * m1 > m2 to decide if the masse m1 is moving.

[@filipin8530]

Thank you for today's lesson, master. Could you teach an introduction class to integrals? I really like your classes, hugs from Brazil

[@user-vy5hf4ei1x]

❤❤❤❤❤

[@whitenoisee336]

♥️♥️

[@Zeerak666]

❤

[@yageg6948]

Thanks a lot

[@ycmathematicsphysicsandche5659]

You are welcome

[@amandaganda1310]

pls teach asymmetrical projectile motion 🙏 thank you so much

[@peachblossom3663]

I’m a kindergarten teacher and love watching your videos! You’re amazing ❤

[@ycmathematicsphysicsandche5659]

Appreciate that you like the videos

[@italiangomato]

👍👍👍

[@ycmathematicsphysicsandche5659]

Thank you