Newton's Laws of Motion - Physics 101 / AP Physics 1 Review - Dianna Cowern

[@saucerset12]

I started my physics degree at 44 yrs old. Got it in '19 and now I am working on a BS in Mechanical Engineering. It's NEVER too late to start learning.

[@ligh7foo7]

hurray, I am 39 and attempting the same thing. Well I need to get through the year 11 level of physics first then I will progress to bridging courses and a degree.

[@davewilson13]

I had a 66 year old working on his PhD when I was an undergrad, never too late!

[@Arun-nt4kv]

Way to go. 👏

[@StayPuft787]

The heck you use it for ?

[@saucerset12]

@@StayPuft787 What ever I want. I'm retired so I do it because I enjoy learning.

[@berlintour4712]

3:50 Hermoine: It's leviosa not leviosaaa!! Diana: It's inertia not inertiaaa!! BTW really love the way you teach!! Thanks 😊

[@FatManWalking18]

delightfully ripped off from A Fish Called Wanda with Archie's daughter "Portia" [john cleese's actual daughter]

[@HarryPotter-no5jw]

I couldn't stop laughing at this

[@physicsgirl]

Best example I've ever seen of inertia: when astronauts just LET THINGS GO in the space station, and they don't fall. (Astronaut Tom Marshburn made a fun parody video doing an interview back on earth where he dropped a cup "forgetting" gravity was there. It's great.)

[@brycering5989]

lol, "ohh right, Gravity, but can I still use the hose, it makes me feel safe" ;) On a side note, on point, I am a Bus operator. I have seen many of these laws of motion (Inertia) in person (we all have as drivers Riders etc). one time was when I was a kid on a school bus, The driver had to stop quickly, I was on the middle seat down the back of the bus. The bus stopped, but I slid (Still in the seated pose) down the wet aisle towards the front of the bus, I wonder What the others though as I magically transported past them in that seated posse.

[@YugamAggarwal]

Thank you teacher for taking Class xD.

[@infinity6678]

I am from India Loved your video Watching it at 2:00AM

[@physicsgirl]

@@brycering5989 That's great imagery, I laughed out loud. I wonder how many people have ended up in awkward situations because of Newton's 1st Law.

[@physicsgirl]

@@infinity6678 2am?? Newton's laws can wait.

[@Ginga7r]

I wish I had you as my School Teacher who has made learning fun, Thank you so much I've learned a lot.

[@ehomelessvillageidiot3051]

Unfortunately most people teaching science didn't want to teach science and only started teaching it because that was the only option as it was the only position open. Many of them barely passed the science classes necessary to earn their degree. Let that sink in.

[@hrithikgeorge4571]

Eegore Beaver *Opens door*

[@ehomelessvillageidiot3051]

@@hrithikgeorge4571 I'm confused? 🤔🙄🤪

[@deepakjoshi823]

I wish the same! 😊

[@deepakjoshi823]

@@stratoinc.5531 I can easily figure out what's going on in your mind! 😠

[@advideos3953]

i wish you were my physics teacher. you just make everything simple, THANKS

[@advideos3953]

OMG! She liked my comment. OH MY!!! Thanks

[@avidnongetit8710]

Sincerely, Thank You. I had a very mean math teacher as a young person. She terrified me about my self worth and math ability. But as a grown up I am delving into math with quiet gusto. For myself, your gentle enthusiastic lessons are easy to follow, easy to comprehend, and excite me about physics. A subject I firmly believed I had no business researching, though life is not interesting without examination...

[@suzannestrickland1586]

I always feel smarter after these. Partly because I learn new things and partly because I already knew some of it.

[@aditipandey7748]

I think Diana's drawing is improving. 👍 And with that our Physics is improving. Thanks Diana

[@thomasewing2656]

Don't forget to give those silly cows some credit!

[@gjcebelak8315]

19:31 did you actually call them "cowculations?" Brilliant!

[@sitarnut]

Right on gj...How can one not love this girl...humor, plus cool science...I bet she has all Gary Larsen's cartoon calendars and books...

[@nicolashabak7299]

A haiku of my favourite things in physics: An ideal gas Assume frictionless surface A laminar flow

[@brycering5989]

"a cow, we'll make it a square cow for simplicity" me; lol, that is strange "I actually have a square cow! me, lol, lol. still strange, but yeah, it's cute :D

[@Lukiel666]

You can use it to illustrate the square - cube law!

[@heckler73]

I prefer my cows to be spherical... _for simplicity_

[@FatManWalking18]

like the spherical chicken in a vacuum joke?

[@JefesGarden]

What a perfect object to illustrate mooooooovement! 🐄

[@DavidTaylor-nz7ts]

Thank you, this will be making an appearance in my 8th grade, Physical Science classes. Hopefully, we'll be back to in-person by then (spring semester) and they can manipulate/work with their own version of tiny cows to explore Newton's Laws.

[@J.Tronix]

If that’s physics 101, I’m going back and getting my engineering degree... I can’t stand accounting any longer

[@rawfiul.]

yeah? why is acceleration m/s^2 and not just m/s ?

[@invinate]

@@rawfiul. m/s is velocity

[@victormpapuluu6497]

Hi I quit accounting in a university to go get a diploma in mechanical engineering in a polytechnic.😉 Follow your interest man.

[@chrispeoples4606]

@@rawfiul. Velocity is how fast, or the rate of change of an object's position with time, expressed with units of m/s. Acceleration is rate at which velocity changes with time, or how fast 'fast' changes with time, units of (m/s)/s or m/s^2.

[@animikhaduttadhar2284]

Velocity is not just distance/time. It's that magnitude in a specific direction, that's what makes it a vector. And more often, you'd see it written as displacement/time. Acceleration is simply the rate of change of velocity (which is the rate of change of displacement covered with respect to time) with respect to time. That is saying how much did my velocity change in a certain amount of time. So, if I was travelling at a velocity that would help me cover 3ms in 1 second (3m/s), now, I'm travelling at a velocity that will help me cover 5ms in 1 second (5m/s). And let's say this change happened in 2s. Then the acceleration comes out to be 1m/s^2. That is simply saying in every second that my velocity changed, it changed for 1m/s. Initial velocity here would be 3m/s for it is the velocity I was moving with initially and then it changed to 5m/s in the span of 2 seconds and 5m/s is the velocity I'm moving with finally, or at least in the context of this example. Hope this helps clear things up. Ask me questions if you have any.

[@arulgupta1639]

it's just amazing how you can teach every chapter in around 20 min whereas in school it takes the teachers about 1 week or so pls keep teaching us the same way you are right now. it's just mind blowing.🤩🤩

[@h7opolo]

3:50 lol you mock me. that's the type of comment i would leave, i.e., correcting grammar. lol

[@richardperritt]

3:43 Dianna channelling her inner cat. 😹

[@physicsgirl]

Haha! This is exactly what it made me think of. I'm glad someone else picked up on the cat-ness of that move.

[@boston1314]

I'm 1/3rd through this video. I understand Newtons Laws better than I did 40 years ago in High School and is why I opted out of College. I love Physics understand the concepts but could never explain them. I can solve Physics situations But dont know how to explain how I did it. You are Awesome. I wish I had a teacher then as passionate as you. It would have changed my life.

[@samhatman6536]

You might have guessed, if you knew me, I did not take High School Physics because I nearly failed Chemistry, nearly failed Trig, and elements of Calculus, I had to take Algebra three times. But the Cows are cute!!! I am going to look up and buy those little cows because you and they help me understand. You have a hard earned gift of teaching. I am so glad you teach us. I slow down the video for comprehension, cause my math mind is so slow. But it works! Thanks!! Everybody is benefitted by your work. Just Awesome!!!

[@diyathegr8]

This was a pretty cool way to sum up the entire 3 laws... I really liked how u added bits and pieces of random information in between (so seamlessly)... And thanks for showing how to approach physics problems... This has changed my perspective towards questions that seem clueless in the beginning and has helped me solve harder problems..

[@jhwieder2112]

Thank you for all of your great videos. I teach 7th-grade physical science in NJ, and I'm always thrilled when I can show my female students, strong female role models. You are an inspiration. With a little pre-teaching, most of my students really get you. Thanks again. Keep up the great work.

[@geraldsnodd]

You have done a great effort ma'am. The history of STEM subjects is quite male centric.I am a 10 th grader. I struggle to bring female role models for inspiring my fellow female students,but my teachers do not make this effort.

[@satyabehera8240]

Nice video. But I think it is important to discuss the following when we teach Newton's laws. 1) Place a coin on the top of a closed fist. When we suddenly move the hand downward, the coin separates from the hand. Is it due to inertia of coin? If yes, then why does not inertia of the coin separate the coin from hand when we slowly move the hand downward? 2) Place a coin on the top of a book. If you pull the book hard, the coin " seems " to move in backward direction. Is it due to inertia of coin? Coin was at rest. In an attempt to remain at rest, it slips on the book. If it is true, then why doesn't inertia work when we pull the book gently? 3) A popular demonstration is card coin experiment (or different versions of it). Place the coin on the card placed on a glass. If you flick the card hard, the coin falls into glass. The explanation given is that the coin has inertia. It was at rest. Even if card moves, the coin remains at rest due to inertia of rest and falls into glass when it finds no card beneath. If this is true, then why doesn't inertia make the coin fall into glass when you SLOWLY flick? Does law of inertia valid when card is flicked hard and not valid when flicked slowly?

[@dimal7439]

The first one is because when you move your hand very fast you accelerated more than the acceleration that gravity induce to the coin so your hand it will move faster so it will separated from the coin. When you move it slow your acceleration is smaller, so the coin it will try to move faster, but your hand it will slow it down so the coin it will remain attached to your hand. The second one is because of friction when you move the book you gave it an acceleration, for the coin to have the same acceleration, a force must be imposed on it that will give the same acceleration if the friction between the book and the coin is lower than this force, then the coin it will not follow the motion of the book if friction is not lower, then it will follow the motion of the book. The third is basically the same with the second

[@sopasopa1037]

I am so grateful you posted this, you are going to save my Physics exam

[@johnholmberg7302]

I never thought I would say this about a youtube video but I like the how it makes me feel like im back in a classroom. now that all my classes are online I actually miss being in a classroom and these videos give me something to look forward to.

[@jigneshagrawal6597]

It takes about 6hrs of school classes to understand all that and you did it in 20 min amazing

[@sschmidtevalue]

I love this even though I have trouble following the math. It's been over 40 years since I had algebra and I have only used a smattering of it since then. In any case, I love your enthusiasm. Keep 'em coming!

[@angelalewis3645]

Dianna, you are such a delight! Thank you for these lessons!

[@praveens9014]

Even my teacher didn't explain this in detail,she blew up this topic 😂. Thank you

[@techhelp1941]

Every time order of differentiation changes....nicely explained Diana.

[@sakios4094]

Your methods are easy to understand. If all my physics classes were like this, I wouldn't be scared of physics anymore.

[@danielquirco1]

I don't know if I commented this already. I'm a physics teacher, I don't need to watch these videos. But I do it for the pleasure of seeing Dianna's enthusiasm and charisma.

[@tmann986]

I’ve taken some math classes, two semesters of physics, and now im in engineering statics class. I need to come back to have a better understanding of forces. I love learning ❤

[@AstronomywithManas]

The way you teach is very fun and it feels we are watching the most quality and informative content.😃😃

[@jahnvisingh8015]

This video is like a blessing for me Next week I am having my physics exam and I was quite worried about this topic. But now I am stress free because who else could be a better Physics teacher than Miss Diana😇 Thank you for making this video 🤗

[@eccentricOrange]

How are your explanations so lucid? Absolutely love it (and the quadrilateral cows too)!

[@infinity6678]

when someone slaps me he also get slapped technically by my face and this is action reaction !

[@avidnongetit8710]

That was Hilarious! Sincerely

[@camilazoroza1742]

You are literally going through the things I'm studying right now. In almost the same order 😂 Thank you for giving me the basics 💜 ...and being a role model of women in science

[@rubixstars]

Even I wish I had you as my physics teacher, you make everything so simple to understand! Thank you for helping me! Tomorrow I have an exam and watching this video will definitely help me tomorrow, thanks again!

[@carlbarker7368]

I want to simply just say thank you to your motivational and fun introductions into physics. If you can explain it in your own words, which you are a genius, it makes it so much easier to follow and understand. I feel so great about what I learn that I feel like I can takle the problem of theory of everything😁

[@nwimpney]

I'm not a physicist, but I have a hunch that the bottle trick is not creating gas bubbles, but vacuum bubbles. There's probably a little bit of boiling going on, but the reason the impact is so sharp as to break the glass, is because there is no gas to cushion it, you have the bottle and water being pushed together by both atmospheric pressure, and maybe some extra pressure trapped in the top of the bottle, and nothing is there to slow it down before it hits the glass, and because the water is almost incompressible, all of that inertia is dissipated in the very instant they hit. Any boiling and re-condensation that occurs, will actually spread out the impact. and make the glass less likely to break.

[@piguyalamode164]

Random technicality that doesn't really matter: The newtons third law force equal and opposite to earths gravitation effect on you is not the force that pushes you up from the ground. That honor goes to your(absolutely miniscule) gravitational influence on the earth. The force pushing up on you is a completely unrelated force that has to be the same as the force of gravity due to physical reasons(similarly to how the rope must have a tension force because you can't just pull a rope apart). The force pushing up on you in your chair is called the Normal force(the worst name ever). You can do several experiments to prove that it is not the same as gravity. The easiest is just to put something that can slide on a sloped surface. You will observe that the object accelerates down the surface, which means it must be experiencing a net force(parallel to the sloped surface) and it must be caused by gravity or the normal force because those are literally the only two options, so the normal force cannot be equal and opposite to gravitation. The normal force does have a third law compliment, because the normal force can be thought of as the force that stops you from falling through the earth, and the third law compliment is the force that pushes the earth away from you as a result(exactly countering the third law compliment of earth's gravitational pull on you)

[@Malmo117]

May the force be with you Dianna! 🙏🙏🙏🌸

[@FlatzoidsPerspective]

You explained it well thank you, just one problem. Gravity is not known as a force hasn’t been this way for over 105years. And the idea of Gravity can push not just pull then that would entail that that gravity does not just have one vector.

[@Arwijn33]

Relative Density Theory explains every phenomenon popularly associated with Gravity. When an Object's combined Density is higher than the medium it is in a Force will cause it to displace or when obstructed from motion exert pressure downward (a rock in air or water). When an Object's combined Density is lower than the medium it is in the same Force will cause it to displace or when obstructed from motion exert pressure upward (a balloon filled with air in water, or a helium balloon in air). Other forces introduced will combine with the Relative Density Disequilibrium Force to alter the path or pressure direction (like an accelerating car on what is in the car).

[@FlatzoidsPerspective]

Arwijn correct it’s all just relative density

[@Gulkrom]

Since I found your channel I am in love with physics, I love your enthusiasm, awesome content, greetings from Chile

[@dr.x4698]

Love From India!! Dianna 🧡♥️ Just Be Happy keep smiling like this And keep Physicsing!!😊

[@djarp1772]

Im 11 and I find this stuff so cool. Thanks

[@amacro11]

I thought I was too cool for school, now I must start again Thanks for your most clear explanation Al

[@dennismcavoy860]

I think Diana should run for president her slogan could be make America smart again😘

[@bobjackson6669]

Loved the physics 411. I shared this with my grandsons age 10 and 6. They love your videos.

[@John.0z]

Can we sent flat earthers and gravity deniers to this video? I know, it is a cruel thing to do to an honest physics channel. But you demonstrate science principles so well.

[@edmiller5101]

I should have taken Physics in school sounds very interesting. But I stuck with Biology classes and carries a 95 average in high school and a 3.5 GPA in college. You would have been my favorite Teacher/Professor.

[@musicmanmatt87]

Thank you so much for doing this! I hope it helps a lot of people in school and out of school understand the universe.

[@jozsefizsak]

It's great pleasure to see your enthusiasm for physics in these highly informative and entertaining videos. I completely relate. The one change I would suggest is to do away with the currently fashionable sudden, startling whooshing noises that sometimes accompany an edit or small visual effect. I think my preference not to be startled in this manner is likely not unusual and the experience is distracting and disruptive for no useful purpose. Anyway, keep up the (otherwise) wonderful work! Love the square cows too. 😉

[@anusmitaguria6549]

You made our learning so much fun and understandable.... 😀

[@raheebr2438]

I love this series! You make physics so much fun and very interesting to learn! I love the guest speakers at the end as well! Looking forward to future episodes! So excited to see whats next! 😀

[@nobodyyouknow9839]

I have very interesting question about motion at this point of course :- "Galileo was punished by the church for teaching that the sun is stationary and earth moves around it . his opponents held the view that earth is stationary and the sun moves around it .if the absolute motion has no meaning , are the two viewpoints not equally correct or equally wrong ? "

[@animikhaduttadhar2284]

Well, every invention or discovery has been improved upon. What he said was the most correct in those times. The main point we infer from his discovery is that the model of the solar system is heliocentric (sun is at the centre) and not geocentric (earth is at the centre) which remains true. It could be possible that I'm misrepresenting your question so let me know if that is the case.

[@ingGS]

“The scale is calibrated to a weird unit called Pounds”. Preach! 👏. Can’t wait for the day the US fully transitions to SI units.

[@rmeaso]

As a physics teacher, I love these videos and would love to use them in my classes, but the auto-captions that they currently have do not meet ADA standards for my Deaf and Hard of Hearing students. KZbin makes it pretty easy to go through and edit the captions for grammar and accuracy (ie adding punctuation and correcting any words that did not transcribe properly). I know many of your videos are on DCMP (described and captioned media program) with full and proper captions, would love to see that for this series of physics videos as well!

[@anshumanarya9215]

Watching this one night before my physics exam!!😅😍 The same topic in books is really horrifying 🤣

[@connorbecz3036]

You are really starting to own the show and make it your own. Great series!

[@itsreeah2663]

Sending science hugs and kittens (kisses) to those who need them. I love you all, and stay safe. Wash your hands, cover your face and stay 2m (6 ft) away. We will get through these times together.

[@Lukiel666]

Those of us who wear contact lenses had a head start. Always washing hands to keep them clean because we actually touch the surface of our eyes with them. Oh and I came up with a friendly phrase for you, as hugs and kisses would be too personal, 'Hugs and kittens!'

[@itsreeah2663]

Hugs and kittens for everyone

[@Chapusse]

Thanks to your very cute square cows and your cleverness and pedagogical clarity, now I understand the classical laws of motion much better. Thanks, physics girl!

[@Weissenschenkel]

Many years ago we had an experiment for measuring gravity using a pendulum. We measured 9.795±0.003 m/s² for a height of ~14 m above sea level. It's a cool experiment everyone can do at home.

[@phen314]

This is the first time I've ever heard about a cow on ice without it being about how Maria Sharapova once called herself that describing how she played on clay courts. May your square cows also go on to become two-time French Open Champions.

[@John-ci8yk]

Thank you for all the time and effort you put into your videos, thumbs up.

[@karanchauhan355]

Do take Rotational motion in upcomig classes its very interesting. I love solving those question .

[@shaun138]

Braille Army represent!

[@anaxiron]

We need teachers who love the physiscs like you

[@cjmenagh882]

Nice video. Introducing the concept that inertia is what imparts mass, just like the Higgs field does, cool.

[@jackleejonesjr.2995]

Dianna I love most all your stuff... The stuff I don't like is just because I love you! Happy Physicing!!!!

[@seboston]

Another physics teacher here who loves your videos but still wants no nitpick a little bit: Around 8min you use the bracket notation for units. As far as I know, the standard usage would be like this, however: [F] = [m*a] = [m] * [a] = 1 kg * 1 m/s² = 1 kg*m/s² = 1 N The brackets meaning "unit of..."

[@drwijnen1729]

Love your videos, thanks so much for making them! As a physics teacher, I always look for videos like this for my students. Of course I check if they are correct. Yours are always very good. In this case, I have just one comment about it: you prove that F=mg using the assumption that all objects fall at the same speed in vacuum. To me, it feels much more logical to argue the other way: gravity is proportional to mass, so F=mg. Then knowing ΣF=ma, it follows that if gravity is the only force, a is constant and independent of m. Which you can then show to be correct through an experiment. The crazy thing about all this is that the amount of inertia of an object is determined by some property which we call the mass of the object, and the amount of gravity is determined by some property which we also call the mass, because it turns out to always be the exact same thing. Why??? Why are there no objects that are affected very much by gravity, but are easy to accelerate? Or the other way around? Asking that question, even if we don't know the answer, can help in understanding the concepts of mass, acceleration, gravity and force.

[@iabervon]

I think, even in Newton's time, people would have agreed that the reason your cart moves faster on dirt than grass is that the dirt doesn't pull back as much, not that the dirt helps the horse push, which implies that, if objects in motion do need a force to stay in motion, the necessary force can't be more than is required on the slipperiest surface, which is much less than on most surfaces, so it can't be the main practical concern if it exists at all. I think the bigger surprise is that mechanics doesn't depend on velocity, because it's hard to get an object not to experience a force that depends on velocity and dominates the other forces over the range of velocities you'd like to use to get measurements.

[@1174juanamaya]

I’ve learned so much more watching you explain physics, thank you🌹❤️

[@vladkindfox1321]

....i knew this things...laws and everything....even about baloons...but your explanation is so good) You're a breathtaking! Love you! ❤️

[@GreggGies]

Brilliant. That's a better explanation than I got in university.

[@wildmanofthenorth1598]

9.81 is a approximation not really a constant because this acceleration will change with latitude. You units are acceptable to the masses though ,acceleration ranges from 9.764 m/s to 9.834 m/ s2 depending on altitude and latitude.

[@cesarvidelac]

I wish I had a teacher like you when I was in school! The math and method to teach were sooooo boring I almost fell sleep... Great video!

[@Chahal654]

Thanx 🙏🏻🙏🏻 and I'm from india just love the way your explanation about concept

[@jizburg]

Omg. To actualy been alowed to read from the original manuscript. Thats a very specific flex

[@三元平衡定律]

The law of ternary balance: In a system, the process of two non-equilibrium states tending to equilibrium is the process of ternary equilibrium.

[@serviceoverself2375]

You are an amazing tutor. If you were around in my time I probably would have derived a physics formulae.

[@Birdmanondaweb]

Talk about perfect timing. I'm just about to start my physics homework focusing on Newton's Laws. :)

[@sonusarraf1663]

Dianna 2nd Law talks about rate of change of momentum. At the moment you equate it with F=Ma, you just undermined it's verstility.

[@sonusarraf1663]

Only in simple case of constant mass it turns out F=Ma.

[@kaideng2571]

Perspective is important when it comes to understanding forces.

[@bodan1196]

One physics teacher I had, showed us inertia with one small weight tied by thread under a heavy weight in turn hanging from a makeshift, though sturdy, scaffold. When he pulled slowly down on a thread, tied beneath the smaller weight, slowly, of course as everyone in the class (I assume) thought, the thread between the heavy weight and the scaffold broke. Both weights plus 'the pull' proving too much for the 'upper' thread. Then he reset the experiment and instead pulled quickly. To everyones (I assume) surprise, the thread between the weights broke. The heavy weight still hanging by its thread. Thus he demonstrated inertia to us. This was thirty five years ago. Still remember the surprise I felt.

[@marmundo9110]

Woooo you just blew my mind at 4:11! Why is it that all (or at least the main ones) Latin-based languages and English (for most words) and I think German and Dutch too? have a hard and soft 《C》 but not Latin itself? (And Irish has a similar concept too but it's broad and slender instead, which makes the 《C》 always sound hard to the untrained ear.) So I obviously paused the video, forgot about my breakfast and went all research mode, and yeah, my breakfast went cold. Eating cold eggs was worth it though, it turns out that there was no such thing as a soft 《C》 in classical Latin, but it did become a thing in late Latin due to a phenomenon called “palatalization”. It was historical. You teach us about everything!!

[@depressed_neutron]

Thank u just came from online class abt the same thing but didnt understand even a thing but now i understood

[@ThoseMadFoxes4330]

Ooo neat! So a mud puddle would be a good example of a condition where the earth isn’t pushing up on your feet as hard as the force of gravity pulls you in ^^

[@osmosisjones4912]

Panels on wheels within a fluid with in pipes with in the walls. Would move the mass of the ships in certain detection . combined with conventional rockets behind

[@garrycollins3415]

I saw Moiya on the Impossible podcast. Very interesting story and career path.

[@Taran72]

Loved your video!!! It's interesting, fun and clear in the way you speak. Just perfect. 👍

[@TheBinarydeity]

Incredible video. Thank you for the information. Very useful.

[@aline_soares_]

I'm 35, from Brasil, and just understood it better than when learned it in school, in my native language, yeeeaaarrssss ago

Dianna next lesson work energy power or pulley or pseudo force 🥺🥺 TBH it's helping me in my studies🥺🥺

[@sakshammisra3756]

From exploring to teaching...it's a journey

[@TheOddsMustBeCrazy]

Question regarding the second law. Consider a 10-ton truck, going a steady 60 m.p.h, F=ma suggests it has no force, because the truck isn't accelerating. If I got hit by that truck and the paramedic told me the truck had no force, I would have a hard time believing him/her. How would the paramedic be right, or would they?

[@cupid111aby]

Your channel deals with my favourite subject. I loved your channel and you too,sis

[@Hod_ranadeep]

Your teaching and understanding technique is real too much Better than My physics professors Of IIT Kanpur (India)....

[@jkobain]

Oh, I never knew that Dianna was born on May 4. Nice timing!

[@daveoatway6126]

Delightful! And excellent teaching. Thanks