1D Motion & Kinematics - Physics 101 / AP Physics 1 Review with Dianna Cowern

Never taken physics before? Want to learn the basics of physics? Need an AP Physics 1 review before the exam? This course is for you!
Exercises in this video:
PROBLEM 1
A girl is riding her bike with a constant velocity of 10 m/s. How far has she gone after 7 seconds? Graph her motion both in x vs t, and v vs. t. Show her displacement on both graphs.
PROBLEM 2
A driver is driving at a constant velocity of 20 m/s. She steps on the gas at t=0 and accelerates to 30 m/s with constant acceleration. It took her 4 seconds to accelerate. How far did she go in those 4 seconds? Graph her motion on a v vs t graph and show the displacement on that graph.
PROBLEM 3
A biker, biking at 10 m/s hits a tree and comes to a complete stop. Assuming a helmet “crumple zone” of 10 cm, what is the minimum acceleration her head could undergo? How many “g”s is that?
Dianna Cowern - Executive Producer/Host/Writer
Jeff Brock - Lead Writer/Course Designer
Laura Chernikoff - Producer
Spenser Reich - Video Editor
Sophia Chen - Researcher/Writer
Levi Butner - Videographer
Hope Butner - Production Assistant
Darren Dyk - Slow Motion Cinematography
Andy Brown - Curriculum Consultant
Set Design - Lauren Ivy
Vanessa Hill - Consulting Producer
Aleeza McCant - Illustrator
Alicia Cowern - Transcription
Lucy Brock, Samantha Ward - Curriculum Consultants

[@wulfhart2]

If you were my teacher in High School I would have learned to love Physics.

[@okboing]

I already love it and having my idol teach it makes it that much better

[@okboing]

@Robbi Rose so?

[@abd1x7]

True

[@matthewm3]

I like my physics teacher as much as Diana, he was my favorite teacher.

[@rodneyrodriguez9303]

She can teach me anything.

[@NewMessage]

My 11 yr old daughter's first takeaway from all this: "We have boring band-aids."

[@1005corvuscorax]

Your 11 year old is wise. She sees beyond function to form. Adults say "1+1=2", but she might say "Yeah, but 2 is boring compared to 3.14" :D

[@michaelsommers2356]

@@1005corvuscorax Two may be boring, but is has the advantage of being right. Being right is important when you are building a bridge or firing a rocket, or doing lots of other things. Boring bridges are good; they stay up. Exciting bridges, such as the Tacoma Narrows Bridge, are not so good.

[@erictaylor5462]

@@michaelsommers2356 Indeed. "How was your flight?" is hopefully answered, "Very boring"

[@Bwachaauh]

Dam you! I was wondering why there was a bell and an alert there! 🤣🤣🤣

[@fatonisodiq9341]

Just take some crayons and paint all of those ;D (not recommended)

[@TheHuesSciTech]

9:43 "You don't need to understand calculus to do physics" -- while a contour integral symbol is floating just above her head... :-)

[@physicsgirl]

I didn't say I didn't love calculus...

[@blake2506]

@@physicsgirl wow 😬😬😁😁

[@sidd0405]

@@physicsgirl I love calculus a lot.

[@justaman5418]

@@physicsgirl nice1

[@josewui414]

We love that line integral from Ampere’s Law 🥺

[@ursgros]

Danke! Wish you all the best.

[@rodcm1]

I started teaching undergrad dynamics yesterday! I'm sharing this with my class

[@Luffy61C4]

5:00 my physics teacher used to say that all points of the curve may be wrong, but the curve itself may be right

[@ishanpednekar6576]

Your Physics teacher was ABSOLUTELY wrong

[@Luffy61C4]

@@ishanpednekar6576 if you say so

[@Hi_Brien]

Well yeah, did you remember the +C?

[@Luffy61C4]

@@Hi_Brien said like this without the context, no i don't remember, may i with it

[@Hi_Brien]

@@Luffy61C4 In calculus, when we integrate we have to add a +C at the end of every problem. Integration is the oposite of a derivative, and a derivative is the slope of a curve. So when you're integrating, you're trying to effectively find the original graph while only knowing the slope at any point. That means that the curves/shape of the graph, will be right, but you might not have the right y-value for any point, forgetting the +C would mean you're assuming a specific y-value which is wrong and bad.

[@seanc6128]

I took AP Chemistry in High School intending to take AP Physics later on, well I failed chemistry pretty spectacularly and never took physics. So now you are helping me make up for lost youth or something like that.

[@majesticapplebum8446]

I can't help but smile all throughout this! I discovered this channel when I was in eight grade and loved it ever since. from watching the 101 things to do with a physics degree, i decided to have one too and now I am on my second year in applied physics in college! The explanations are simple yet elegantly presented here that I felt that excitement when she finally puts it all together for the equation of motion like its my first time knowing it hahaha. Looking forward for more of these!

[@orfeassiozos1575]

After 11 years of formal education, out of which I studied Physics for 5, I just realised that you can find the time by calculating the average velocity from a graph. I mean I guess I knew you _could_ do it but I never realised how handy it is!! Really looking forward to the next class!

[@KalyanChatterjeesinp]

Hey Diana, you just do great things with physics. I use to see your work every time. As a physics professor, I also try to make physics fun to the students. I am planning to put something like fun of physics in KZbin but probably will do in Bengali(my native language) mainly. Thank you for inspiring me. I wish you all the best for your Channel.

[@thenomad9963]

Wow, your derivation of the "equation of motion" was amazing, even though I've probably used that formula more than 100x time in physics class. That was the very first lesson I had in AP Physics, but it never occurred to me :( physics is so much easier when you think of it this way. Awesome video!

[@loutalksabouteverything2575]

Dianna, So much to think about with this one episode. Physics the study of everything! I was in my office one day and a bird struck the window and fell to the ground. Outloud I wondered what force the poor bird experienced? A good friend Steve Kaye, came over and said we could figure that out? So he began to write a formula on my whiteboard and we figured it out. From that day on I realized that Physics was the most amazing science and very practical. Thank you for this first class. You are so amazing. I hope your injuries heal quickly.

[@christopherbarber9351]

Thank you, Dianna! I've been wanting to re-visit the physics I enjoyed learning in 1964, now you're giving me the opportunity to do that!

[@Killerspieler]

"what if we changed that to velocity over time?" Me, who watched the latest Vsauce video: *points at screen like Leonardo DiCaprio*

[@perfectoid8376]

Underrated!

[@md.imamulislam7]

Which VSauce video, may I ask?

[@Killerspieler]

@@md.imamulislam7 very valid question, even if it will stay to be the latest for some time probably 😅 it's "the odd number rule" kzbin.info/www/bejne/i2e5c4lqhrqAq5I

[@Anonymous-xe5yn]

Dude, he is dead.

[@Killerspieler]

@@Anonymous-xe5yn Might you be confusing him with Leonardo DiCapito? 😜

[@whatisthat7539]

6:30 my high school physics teacher when I forgot to write units on the blackboard "what is that number, potatoes? Tomatoes? What's that?"

[@marcelweber7813]

Same. Even in Germany.

[@arsonor]

My favorite one to use is “lobsters?”

[@mariangalua9623]

same here in Philippines

[@odeentb]

A teacher like you at primary school was the one that led me into physics at the university in the end. I love physics, I love your channel, as you do what I, more or less, do every time with people (specially children) around me, but in a much cooler way. I think this series are fantastic! keep it up !

[@mikedrop4421]

It's so amazing that when you ask someone to draw a bicycle from memory they almost always fail to draw something that would actually function.

[@arsonor]

I love the phenomenon based instruction you’re doing. I’ll be using this as a week one introduction to kinematics in AP Physics classes. Keep up the good work!

[@frederickamalemerson1059]

At 18:43 , Dianna writes delta t = 0.1/5 =0.05 but actually is 0.02 Can you please rectify that? Also Big Fan and love you work. Dianna you are for me a physics goddess

[@rekarlopunzalan]

Yeah I also noticed that

[@mixei4]

And then 10/0.05 magically become 500 :)

[@thomson7395]

Yes I also saw it😂

[@oreubens]

@@mixei4 Physicsgirl, not Mathgirl 🤭 Easy to make mistakes. Going to need some more proofreading (proofwatching) going forward :)

[@davidasimmons]

This kind of thing used to happen to me when I taught physics. My advantage was that there was always THAT kid in the second row who’d catch it right away. Diana needs to hire THAT kid. 😉

[@davidtulipane9139]

I am in my late 60's. I am finding these KZbin videos on physics as presented by you helps to keep my mind active and agile. With your help the mine could stay young even though the body says I'm ancient.

[@srikarch5175]

Hey Diana, at 18:43 there's a small calculation error, it's 0.02 seconds

[@Liam-iq6qe]

I noticed that too. People are going to try and redo the problem by themselves as "homework" and get a different answer lmao

[@shahrukhshikalgar6714]

I also noticed that

[@ollyalme]

Me too :) But since there was no correction, I must admit for a delta t of a couple of seconds there I feared I was just getting old.

[@CarlosSanchez-hw3bv]

And then she divides 10/0.05=500 hehe, but 10/0.02 is actually = 500, so the math was "right" at the end

[@srikarch5175]

@@CarlosSanchez-hw3bv yeah

[@rickharms1]

I only learned about dimensional analysis in chemistry class in sophomore chemistry in college. The professor took the time because he was flabergasted that we did not learn it in high school. That was in 1970. That was the single most important thing I learned, other than my speech class, that has been of invaluable service to me for 50 years. Thank you Professor.

[@Qz678]

Omg I love this!! I'm a middle schooler and you've inspired me to learn more about science. Thanks :)

[@randompatillo4336]

Dimensional analysis is the best! Saved many an engineering exam for me. You rock. These are great fun to watch. As someone who's studied physics and taught, you are a fantastic teacher. Thanks for all you do!

[@crusiethmaximuss]

This is content we need more of 🙏🏻😌 The perfect end to a hectic and busy work day 😌🙏🏻

[@viascience]

A wonderful start to an exciting series. I'm much looking forward to further installments.

[@colorx6030]

Wow, that's really impressive. I have always wondered how the equation of motion ws derived and I didn't really quite undetstand the explanations I was given. But it was all geometry lol. I'm actually mind blown. It was that simple. Also, you really make learning like it's a fun thing. I can ferl your passion and it's definitely contagious. I am feeling an urge to learn again. Thank you. Regrettably I only found out about your classical physics playlist after we have discussed kinematic equations in our school but I'm still glad I found it relatively early.

[@mennaessam2027]

One of the main reasons i loved physics when i was a high school student and made me switch from going to medical fields into going to engineering school was you really. Every time i build hardness to science because of our sad education system in egypt and the way we are treated as humans you never fail to make me a curious person again. Thank you for existing i really wish i could inspire the world like you do ✨

[@ekojar3047]

Yay! I love learning from you!, you are a great teacher because you are excited to show us something and it gets us excited to see what new thing we are going to learn! Super stoked!

[@AceKaci]

Thank you for making this series! I’m not a physicist, but I love physics and have wanted to understand it better. I have always loved it when equations were broken down and explained. So much so that I had a lot of trouble when teachers switched to rote memorization without any explanation. They’d say, “Plug these numbers into this equation.” “Okay, but why?” “Because I said so.” 😳 Thank you for bringing back the fun of physics in a way that regular people can understand. Your enthusiasm is contagious. I love it! 😆

[@physicsburns]

I'm a Physics Teacher and I have shown many of your wonderful videos in my own physics classroom. I always love your content. As a fellow teacher I feel like you are going too fast. This episode had so many different concepts, and it reminds me of the crash course pbs classes. I feel like it would have been much better if this episode could have been broken down to at least two episodes and you could have calmly gone through each topic. Also, you go on a lot of little tangents talking about crumple zone, time dilation, and other fascinating physics concepts, but I think this only confuses/distracts students from what they are supposed to learn. As a teacher I understand the struggles of trying to show how cool physics is and teach something tangible at the same time, but I think you would do a lot better focusing your material a bit more. I have a very small KZbin channel and I totally understand your struggles, I hope I'm not discouraging, I just see how a few tweaks can lead to massive improvements :). Looking forward to the next episode!

[@gracelewis4016]

I agree with the speed point, I had to pause and think a few times in order to not feel lost. Good thing I'm watching at home, not in a classroom. Not sure what you mean about focusing more on the material though.

[@skitzxplods]

The main things I took away from this lesson is 1. Dianna talks really fast, 2. I understood about a quarter of the words she used, 3. I can't wait for the next lesson and 4. Dianna needs to work on her bike drawing skills. I love your channel, science has always interested me and I enjoy learning new things, you make learning fun. Also I liked the special guest at the end, would love to see you both collab again when the world opens again. 💜🥜🐿

[@EsseroEson]

Seeing that bandages all over her hands and elbow, I thought this video was going to end up showing how fast Diana was going when she crashed her bike.

[@bartoszbaranowski604]

Fast enough for doppler effect to kick in :)

[@timeverse1545]

Yea maybe she didn’t get hurt , she will get that pain while removing those fake bandages

[@physicsgirl]

Not very fast... 🤦🏼‍♀️

[@EsseroEson]

@@physicsgirl 10 meters per second?

[@JoeyTemme]

@@physicsgirl we'll have to wait for your videos on rotational inertia huh? A spinning wheel will right itself, so it's easier to fall off a slow moving bike than a fast one!

[@TheLastChinadog]

I'm not one for math, but physics is just so fascinating. It's like unraveling the fundamental systems behind our universe and describing how it works. One of my favourite classes thus far, though it was a shame that the virus cut them short. Loving the series and can't wait for ep. 2!

[@chiragchaudhari4810]

Hey I from india,I remember my 9th std after watching this.Also I remember my jee exam. love from india .

[@GrantCWilliams1]

I'm IN LOVE with Physics!!!!! I took notes and practiced. This is opening my eyes to all sorts of perspectives on the world.

[@patelfalak]

Teachers make the class boring or interesting, U made it interesting again for me tysm 😇.

[@skarrambo1]

Nice to see you emphasising the wonderful tool that is Dimensional Analysis! I have used it since I was 9, but only learned it's a named, formalised thing in the first year of Uni! I may be turning into a Meteorologist from being a Physicist, but I still tutor Maths and Physics, from GCSE (15/16 year olds) to Professional Adults - and I the first thing I get them comfortable with is Dimensional Analysis. Funnily enough there's a bonus; I find it makes tutees who aren't confident in algebraic operations WAAAAYYY more comfortable! Best wishes from England :)

[@Rubrickety]

Hi Simone! Well done getting through a whole cameo without swearing! :-D

[@mastersubhadeep]

The speed of the ping pong ball @16:01 is 18.9 m/s and after that if we assume constant acceleration, velocity comes out to be 37.9 m/s. Arithmetic jargon aside, great video, didn't get bored at all at any point of it. Lovely bandaids! 😛

[@Maninawig]

9:10 serious question: Why are physicists against acronyms? A=WL is a useful tool (and pun) F=am is important. (Yet both are calculated opposite)

[@JamStph]

You are awesome, physics was my favorite in school. Still holds true to this day. Physics teachers were always the most personable and fun.

[@obinnanwakwue5735]

"You don't need calculus to understand physics." Not yet.

[@streamcuriously9369]

Wow, we really expected these type videos . Keep going sister, so many students loves your videos to learn physics.

[@luismijangos7844]

Dear Dianna, at 18:37 there's an error. 0.1/5 = 0.02 s. I loved the video anyway :) .

[@harthur2010]

Great video. Love that you are doing this course. Your positive attitude is so refreshing.

[@josephhavens3619]

I respect your friend's mixup.. kinesthetics is the motion of the body, which sounds alot like kinematics

[@adituta8660]

This is an awesome series! Thank you, Diana! You are actually helping a lot of people and teenagers with their misunderstandings in physics!

[@adituta8660]

I'm from Romania and I love exact sciences, especially physics! And, yes, I have done a lot of experiments of physics!

[@DhruvGN8]

Thank you for using metric, there are more people who use it than imperial, and it's mathematically better.

[@thomasratliff9278]

Well now, I'm 64 with a recently earned degree in Communications......I couldn't even pass Cal 1. But, I do enjoy watching your videos. You, Dianna, are a performer/teacher/scientist/entertainer/everything anyone would dream of for a professor. Thank you :)

[@peterjansen4826]

That would be a great opportunity to also introduce calculus at the same time. Physics Girl might have seen one of 3Blue1Brown his lockdown match videos.

[@hetp5784]

I just completed Calculus Course & watched this, I wish I could have seen this in the beginning, makes a lot more sense now. I really appreciate your channel and work the Physics Girl...

[@jovan.samuel]

Feeling lucky to be in highschool at this times because I can choose my Physics teacher now xD. By the way, 3Blue1Brown and Mark Rober also do lectures on high school subjects so its freakin great!

[@Nudnik1]

Excellent you are teaching Newtonian Physics. I took this in University in 1980s forget alot. Now I refresh Thanks

[@selena1456]

I am a simple person: I see Physics Girl, I click.

[@potatopobobot4231]

@Robbi Rose dont simp shame us (づ◡﹏◡)づ

[@J3point14]

...i like shrimp.

[@concrete_dog]

Physics Girl

[@maggiemerkle55]

Great video. But there's the kind of math error I always make @ 18:36 0.1m divided by 5m/s equals 0.02 . Then at 18:52 - 10/s divided by 0.02 s = 500 m/s^2 which is the answer you show. Thanks :)

[@miriamjesse1628]

What I learned from this video: Physics Girl is really smart and I'm not nearly as bright as I thought I was. 😂

[@gracelewis4016]

Diana would probably be dissapointed if she read this, as her goal in life is to make physics understandable to everyone...

[@alfamaize]

Dianna... as a former tutor way back in college- love your approach to show all of this. Good stuff. I also taught an engineering class in grad school- and if a student made a simple math error, but knew it, and said- just didn't have time to correct the math- I would give them full credit. But you managed to make two that canceled each other out, LOL. (others mentioned that)- just want people to not only think about the dimensional analysis that you did- but does the answer even make sense. Just like you did on the ping pong ball example.

[@ishanpednekar6576]

Did anyone else notice that in Units, the first m is floating at 7:19 till 7:22 ?

[@abhavishwakarma5035]

Whaaaatttt!

[@ishanpednekar6576]

@@abhavishwakarma5035 Yeah really

[@samedwards6683]

Thanks so much for creating and sharing this informative and educational video. Great job. Keep it up. Hope that each day you are feeling better than the day before.🙏

[@mastershooter64]

man I can't wait for the general relativity class to come out when are we gonna derive the einsteins field equations?

[@vanshsagar5816]

I love the explanation of Kinematics concept.... I think who are unaware of this maybe understand or this concept is making a sense to them... So Excellent Physics Girl.... Keep making awesome videos like that ❤️❤️❤️❤️❤️

[@Anonymous-xe5yn]

Watching this when there were 819 views. Also for the KZbin algorithm.

[@Anonymous-xe5yn]

Liked the video for the algorithm too.

[@Maker_of_Things]

Physics was my favourite subject at school. This reminds me how much I like playing with the equations of motion some 40 years ago! It lead me to studying mechanical engineering. I was then caught between manual calculations that I could understand and do and learning Fortran as we had to hand in our work done on the university's computer!

[@streamcuriously9369]

2.29/0.121=18.9

[@apollo314pc]

Yes I noticed this problem too. It almost sounds like she says divided by 0.012 s in video but she says it too fast?

[@sagnarte6074]

OMG this is perfect! I am taking AP Physics 1 this year! Thank you so much for making this!! You are the best!!! ❤️

[@akshitparikh635]

"You don't need calculus to do physics." My physics teacher just had a heart attack in his kidney after listening to this statement. 😝😝

[@gracelewis4016]

I would have found this a lot more confusing if I didn't know any calculas... but that might just be me

[@david.ricardo]

Using calculus for this kind of simple physics would be like using a rocket launcher to kill a fly

[@20bluebug]

This is pretty cool! Visualizing the numbers like this makes all the difference.

[@kushalgawande7006]

I am in love With physics 😆

[@amtreasure45]

Loved the Simone cameo at the end. Wow... it's been a while since I last used those equations - I need to brush off my math skills. Thanks, Dianna!

[@drpi7405]

There's no harm against an egg contained in this video.

[@pazu322]

Your free-hand drawing of straight lines is wonderful!

[@robertofontiglia4148]

"You don't need to understand calculus to do physics." -- haha

[@EliteCubingAlliance]

Lol

[@JoeyTemme]

I Aced HS physics after dropping calc 1 because I couldn't comprehend.

[@msudawg1997]

I have a mechanical engineering degree. Keeping track of units to be sure that I wasn't mixing apples and oranges was one of the most important fundamental things that I learned in college.

[@imyasharya]

21:20 Wait, that sounds more like a plot of Interstellar.

[@pulkitmohta8964]

Not really

[@itech3104]

Learning physics from starting again feels so cool with dianna...loved it...physics is so cool...I feel like tony stark when I solve physics problems....this feeling is awesome.

[@nick755]

Also known as Tape Girl!

[@shineyuchandra9423]

This is basically the Crash Course Video, but more engaging, and actually understandable

[@samarendra109]

14:51 the contains of the page changes. 🤭

[@frankgulla2335]

What a terrific explanation for the eequation of motion. Nice job, Di!

[@Echo3_]

you are one of my favorite people! I really enjoy your channel and think you are a National Treasure !

[@krystalgomez2300]

You made me love physics diana. Get well soon Thankyou for being an inspiration for me. Blessings and prayers from my side🌼🌼🌼

[@DekenFrost]

This really is like a physics class. When she said "this is what we talked about in the intro video" I had that sinking feeling in my stomach of having missed something important. "Hold on Intro video? What intro video? Oh no what did I miss?"

[@itsmeyahgirl3878]

Omg! Thank you Ms. Physics Girl! Now, I understand Kinematics Equations and concepts easily. Your way of teaching is super cool and it's really easy to catch up. Love to hear and see more from you! Can't wait for the next lesson hihihi! 💗 Love lots ❤️

[@aarondelgado3421]

I loved taking physics courses when I was in high school. Now, I am a mathematics professor and I always emphasize to my students that when they have word problems, they need to add units to their answer(s)!

[@vineetthakur2618]

Your way of teaching is very different, I'm a grad student and already know these concepts, but you present it in a very interesting way, this way concepts get cleared very very easily

[@mickael1290]

That's way less sad than Michaël's "I am leaving you at an everchanging velocity!" story I loved watching the class even though I already know about this, you'd make a pretty cool teacher :D Keep up the good work !

[@alephprime3770]

I' trying my hands at a developing a small 2D game and you have just answered so many questions i had. You're simply the best ! 👍

[@danrudralonewolf3392]

Now a days I start to like KZbin videos of content creators like you. Thanks for help me realize how much I love Physics. 😃

[@jimsvideos7201]

Also, Hi Simone! What a pleasant surprise to see you here, even if it isn't a surprise that you'd be part of something great like this!

[@Echo5Mike]

Kinematics, a course I took during Navy Nuclear Power School, explains why I landed 4.5m when I flew over the handle bars of my bicycle traveling 5.7m/s after a stick got stuck in my front wheel spokes last week. Ouch! Glad I was wearing my helmet. Stay safe out there Dianna.

[@simba2384]

This playlist helped me in my JEE preparation!

[@mr.iguide7508]

This was seriously awesome! Loved the first episode. Definitely hooked up for the future episodes!

[@RichardWongPhysics]

Great energy. Love the emphasis on mathematical modelling. Nice tie in to more advanced topics at the end too. Keep up the good work!

[@AlitaMee]

37 yo me cried at 9:46 . I had to drop out because of really bad circumstances and starting again today. you don't need calculus to understand physics made my resolve to pursue this even stronger. Thanks physics girl your explainations cover lot of areas so easy to grasp from various angles .

[@swagonman]

One thing left unaddressed in my high school and university physics classes was the slope of acceleration. It’s important if you think about standing on a subway train. While at the station, you stand perfectly vertical. But when accelerating at a constant acceleration, you need to lean at a constant angle. But you can’t instantly change your lean from vertical to leaning into the acceleration. So, if the train departs with constant acceleration (what they focus on in school), all the passengers almost fall over. The answer would be a constant slope in acceleration to give us time to lean, followed by constant acceleration. Then a constant negative slope in acceleration down to zero acceleration as we settle into cruising speed (constant velocity). It’s not taught, I think. Also, I think it partially explains how wrinkled the sheet metal sides of the train are. My question to you is, “What is the physics name for the slope of acceleration?” It’s important enough to have a name and be taught, don’t you think? Then the trains could be programmed to be safer.

[@tonpal]

Dimensional Analysis: I was taught about this in the last week before my A-Level Physics exams. If I had known this a few years earlier my understanding would have been so much easier.

[@monkww]

Even tho this is basic physics , this is hands down the best physics class i have ever listened to. Girl u r bloody amazing.

[@pixandmore437]

Very interesting. It proves an Old Dog really can learn new "tricks" or information. I understand much more than I expected I would. You make learning this stuff fun. Perhaps I will learn more by watching it more times. This is a great tool to help a person learn Physics and, with Diana's enthusiasm is bound to make it fun as well.

[@shaileshrana7165]

Watch the ads guys. Gotta support our superstar teacher.