Newtonian Gravity: Crash Course Physics #8

I'm sure you've all heard about Isaac Newton and that apple that fell on his head and how that was a huge deal to our understanding of gravity. Well... let's talk about that. In this episode of Crash Course Physics, Shini sits down to talk about the realities of the apple story and how Newtonian Gravity is more than a little important.
***
Produced in collaboration with PBS Digital Studios: / pbsdigitalstudios
Crash Course is on Patreon! You can support us directly by signing up at / crashcourse
--
Want to find Crash Course elsewhere on the internet?
Facebook - / youtubecrashc. .
Twitter - / thecrashcourse
Tumblr - / thecrashcourse
Support CrashCourse on Patreon: / crashcourse
CC Kids: / crashcoursekids

[@crashcourse]

We made quiz questions to help you review the content in this episode! Find them on the free Crash Course App! Download it here for Apple Devices: apple.co/3d4eyZo Download it here for Android Devices: bit.ly/3TW06aP

[@PictureFit]

I was following the information as best I could but couldn't get my mind over how good of a speaker she is!

[@MixolydianMode]

+PictureFit I can't follow her either. I think it is because the pitch of her voice. I prefer men as teachers. No offense.

[@Catwomen4512]

+mixolydian mode Really? I think she's fantastic, she talks so clearly

[@agnieszkaadamska5228]

+mixolydian mode thats quite understandable. lower voices are usaully more pleasant

[@danilooliveira6580]

+Night Owle even though her accent is beautiful, its a little hard to follow, specially for non-english speakers.

[@Catwomen4512]

***** That does surprise me (I'm not full English), because she speaks proper English, not with slang or slurred speech, which I like. But everyone is different.

[@EugeneKhutoryansky]

There is another famous story involving an apple and a garden, though that one didn't have such a happy ending.

[@malignor9035]

+Physics Videos by Eugene Khutoryansky Newton was born on December 25th. Hmmmm

[@lancelovecraft5913]

A paradise lost

[@iamsuccessful2241]

+Physics Videos by Eugene Khutoryansky The Story of the lost garden where two trees stand...the tree of life..and the three of knowledge of good and evil. yes, a bad ending indeed.

[@malignor9035]

I am Successful Wow thanks for explaining that.

[@billbixly4332]

+Physics Videos by Eugene Khutoryansky We were talking about gravity but lets talk about adam and eve, for no particular reason.

[@_veshma_]

Physics is, I'll admit, my weakest subject. I used to really like it, but soon found it confusing, and complicated. However, these simple, fun, enlightening crash course videos (and some others as well) have helped me grasp certain concepts I could not get before! I actually started liking the subject again mainly because of these videos. I have a Physics exam tomorrow (CAPE Physics Unit 1, paper 2 ; contributes to 50% of my overall grade) and I'm thankful that I was able to learn from at least some of the videos in the series! So, a big thanks for starting a Physics series, +CrashCourse ! :)

[@aldistoteles2919]

Ok 👍

[@chavezharding7820]

I'm doing CAPE Physics unit 2😭😭

[@Hulkitout]

Crash course has come aloooong way. Great going guys

[@crashcourse]

+Hulkitout Why thank you. :) -Nick J.

[@Nabilaei]

legit had no clue what my professor was saying in class till i watched this and be like 'ahhh that's what she meant by that' 😂

[@stefanocappelli]

7:27 Math

[@crashcourse]

+Stefano Cappelli That part made me super happy when I was editing it. :) - Nick J.

[@stefanocappelli]

+CrashCourse Yah, it makes me crack up every time I watch it lol. Nice job

[@Cyrusislikeawsome]

+CrashCourse *mathS ;)

[@agnieszkaadamska5228]

+Cyrusislikeawsome both forms are correct

[@jeanguylouisbourg]

+Stefano Cappelli Press 8 for math.

[@fetchit16]

Okay, I want to let all you guys over at Crash Course know how much these videos have helped me. Crash Course has come so far from what it used to be and, I am not trying to sound cheesy, but the videos you guys make have helped me so much in school and in life. Thank you guys for everything and keep up the good work!!! Best Wishes!!!

[@imnerd4853]

So the people before isaac newton is all floating because gravity wasn't invented yet

[@Holobrine]

The whole apple-falling-on-Newton's-head story has a simple explanation: "I was watching an apple fall from a tree, and then it hit me..."

[@kamalbhamra3146]

Pick one : a) Watt is Love b) Baby don't Hertz me, don't hertz me c) Ohm more! d) Nikola Tesla

[@TheAndr0y]

no Morse

[@tylerbartunek8894]

No Mohr

[@avecaesar1873]

I Kant choose, 'cuz I Nietzsche some help.

[@codelucky]

Uhhh am BohrD

[@tennispie1]

newton's nipple

[@jamesforstify]

This girl is brilliant and communicates extraordinarily well. I'm always happy to watch her physics videos.

[@DagAreHalland]

I'm not sure if it's the speaker or just the information, but I'm having much more difficulties absorbing this than the rest of CrashCourse's videos. Slowing down the tempo might work a bit. It's like a Uzi of information.

[@smaklilu90]

Most videos in this channel have that problem. They try to cram one hour worth of information within 10 min. Unless you were very familiar with the subject and come here to refresh your memory. These videos are not a shortcut to learn physics quickly as many people think lol

[@adamqazsedc]

Pause the video or rewatch it

[@testmcknight7355]

"Math" best line.

[@adrimendez3568]

When I get my IB diploma I will thank CrashCourse for helping me pass my Physics class. Seriously, what would I do without them?

[@MrAnimebuster]

I'm so bad at math, I don't know why I keep watching these... but good job crash course

[@sharkdavid]

Practice make perfect. You can do it!

[@Rhaegar19]

You're not good at math because you haven't practiced enough and/or your basics are weak. Check out "Paul's math notes" and start with algebra. Anyone can do this stuff, you don't have to be a wizard, I promise.

[@frankschneider6156]

+Mr.buster35 And it is not a sign of high intelligence bragging about one's mathematical incompetence, instead of trying to eliminate it.

[@frankschneider6156]

***** I strongly doubt that you are older than me (at least physically). If you feel you have a math issue, that's ok. Can happen, but even if you have a "busy" life you can do something about it if you want to. Try EdX, Coursera or Khan Academy, or do it the old fashioned way by simply using a textbook. Yes this can be done, even if you have a "busy" life. But that's perfectly up to you. But what is NOT ok, is to brag around: "I'm so bad at math (look at me how great I am)" giving young people the impression, that this would be perfectly fine. That's similar to saying "Look bro, I'm the coolest dude, because I'm illiterate". Being bad at maths is ok, but nothing to be proud of. If you're bad at it, try to solve to but don't give kids the impression that being uneducated is perfectly fine.

[@frankschneider6156]

***** If you would be ashamed of your lacking maths skills (as you should be), you wouldn't have mentioned it. If you are not, you obviously deem the status of lacking mathematical skill to be socially acceptable, which it is of course not. If you write in the first sentence "I am an idiot", don't wonder if people think of you as an idiot.

[@sjwimmel]

I'm watching a video on Newtonian Gravity at 1AM before bed. That either says something about me or about the quality of these videos!

[@DanielBeall]

Man I wish these were around when I took physics in college, these are so well done and easy to follow!

[@Adam-hy9ou]

I love these videos but they all talk so fast I find it almost impossible to keep up!

[@MGdriver77]

@ 3:42 That was a really cool and very smooth illustration of the cube being "pulled towards you" I really appreciated that small detail. Thank you. Your videos ARE AWESOME. I am taking physics now, and my (Italian) Professor has a very very thick accent. My struggle in class is first hearing him correctly, then learning the new material lol Thank you for your illustrations. You are incredible, please keep up the good work!

[@thomasmiddlebrook9541]

Loving it. Great summary. I'd love to hear more on Newtonian space, and other systems of perceiving location from the history of science. I think it would be a valuable addition.

[@johnnymulholland6973]

i like the hitchhiker's guide to the galaxy reference at 1:40.

[@fetchit16]

Hahahaha, just noticed!!!

[@spurdo5240]

7:28 this is exactly my reaction whenever I see two things which I believed to be completely seperate be connected through some math equation or another.

[@obbanhegde6291]

SO happy i found this channel !! :)

[@andrelee7081]

So much of physics includes calculus, and you've only scratched the surface! Can you make a Crash Course in calculus?

[@shuriken188]

The problem with a CC mathematics course is that math involves more repetitive practice, rather than just concepts and an example or two. It's not impossible, but it would have to choose between staying true to the Crash Course format and teaching mathematics thoroughly, new concepts far between. That being said, I would enjoy CC math.

[@nootnootpenguino8586]

@@shuriken188 differentiation from first principles is quite a good way of explaining how to obtain the gradient function however calculus is such a broad term

[@RiderOfMooses]

Essence of calculus: 3blue1brown

[@kierhudson1328]

domain of science - Calculus, what is it good for?

[@Flyingtart]

Not only informative, but also this lady is pleasant to both look at and listen to.

[@madLphnt]

this is possibly the most beautiful collaboration of any two subjects on the internet ;-)

[@leahg180]

Yo, Thought Cafe. REALLY nice work on drawing that ellipse. Serves as a quick reminder of what an ellipse is for those of us who briefly forgot pre-calc :-)

[@Garmashua]

She is sooo good that I could not get what it was about :) thank you!!!

[@marystella2893]

Super fantastic presentation

[@alexxchavezee]

This is the greatest video on KZbin right now

[@keagancasey9193]

This is so interesting wtf. i love physics

[@Andrew-vt5bv]

Your videos are so helpful!!!!!!!!!!

[@MrQwerty2524]

Cool! I could understand her very clearly.

[@iamsuccessful2241]

She did it all well! I hate Mechanics when it comes to physics..but I love it through these videos of CrashCourse... :D can't wait for Optics and Acoustics..I know those things are in later lessons....still i'm excited....especially when we are going to deal with the Universe itself and the forces that governs all...probably like String Theory, Dark Matter, physics of blackholes, Time travel, and the Space-time continuum...

[@jorgeromeu]

Fantastic video

[@kalumohammad2449]

You changed my life Now im in love with phy Thanks you

[@shantanukawale9127]

great work you all r good guyz...

[@ObitoSigma]

Literally just took my AP Physics 1 exam an hour ago. I am never self-studying an intuition and lab-orientated exam again.

[@burakb8708]

I love this serie.

[@davidjara23]

I felt that a point that was missing was the fact that Newton discovered that the inertial mass was the same as the gravitational mass (I know thats linked to the gravitational constant, but it goes much deeper).

[@AA-ri6iv]

this is so good

[@kabirkrishna8520]

mind blown. learnt it the best way i would want to learn it.

[@madrauisce71]

Excellent!

[@shaandutta3541]

i love this fun way of explanation ;) :o

[@justinmirza7876]

WONDERFULL tutorial. Thanks to teacher, to Sir Newton and his predecessor Kepler! WOW: So as gravitational it is impacted by distance, the Mon to close of earth= will hit us; the Mon to far away of the earth=we will lose it . Both with dramatic results i suppose for our dear life. Who put the Mon on it position? HUGE, TOTAL Respect to the Designer!

[@rchuso]

+1 for the Douglas Adams quote. (plus the other "stuff", as well ;-)

[@MyGalaxy]

Thanks for describing newton's law on universal gravitation

[@sicfxmusic]

Thank you

[@dryzalizer]

Great episode, for me the best part was 7:27

[@nethminimadushani6649]

wow i understood it very well thnx

[@KannikCat]

Hehe, love the subdued "Math!" ... :D

[@OSUfirebird18]

This course is moving on really quickly! I wonder how long before we get to electrostatics!!

[@mehrajudean3032]

Thank u so much mam

[@scienceandmind3065]

Nice video again. I wonder how far in advanced physics this course will go. I would love to hear about the Maxwell-Equations, thermodynamics and quantum physics in this style. Even if I have learned about most of the topics I like to hear, see or read about them again and again. Btw it's said about Newton that he repeated the old Greek mathematicians before he came up with calculus. I think constant thinking about and working with science is the path to mastery in ones field and there is no higher joy than finding out how the world we live in works.

[@frankschneider6156]

+Sylorinnis Would you care to explain why you think you need fourier analysis for either Maxwell's equations or quantum physics ?

[@frankschneider6156]

Sylorinnis We didn't do any Fourier transformation in quantum mechanics.

[@frankschneider6156]

Sylorinnis No it just says, that you can do QM without it. An you can even do the Maxwell equations without it.

[@guillermocastellanos1967]

amazing

[@Gabriel_Bento]

Hey! Amazing video. Faz um falando sobre Leibniz =D!

[@pranjalshukla4584]

You are great

[@PinkChucky15]

I just love when things in science fit together so nicely, like Newton's and Kepler's Laws.

[@theharps6]

I love crash course😍

[@yunusemrecanozturk7751]

7.27 that needs to be A gif.

[@Intoxicatious]

+Ordinary Guy It will be soon!

[@yunusemrecanozturk7751]

+KnowledgeableReaction thank you

[@Intoxicatious]

twitter.com/thoughtcafe/status/733720921194778624

[@leah973]

7:27

[@leah973]

7:28

[@GelidGanef]

Was Cavendish the guy who did the thing with two tiny lead balls hanging by a thread, seeing how much the tiny gravity between them would twist the thread? Because that is one of the freakiest and coolest physics experiments ever done.

[@mayraelmiller5493]

OMG that selfie stick got me 😂

[@brendamojica8305]

es muy interesante toda la información otorgada en el vídeo, pero seria perfecto implementar subtitulo en español para que otras personas también se beneficien con este conocimiento.

[@jasonl.n.williams9380]

She talks so fast!! It was necessary to turn on the transcript to follow her!! Very well done, so much info in one video!! Crash Course my Head!!

[@OMEGA-362]

I laughed hysterically at the reference to hitchhikers guide to the galaxy

[@perpetualpolymath5961]

Let prove Keplers Law using Newtonian physics Basically keplers third law stare : r^3/T^2 = K where K is a constant. We know that objects orbiting the sun orbit in circular motion and that centripedal force is wholly supplied by gravity thus: Fc = Fg we know Fc's magnitude is Fc = mv^2/r therefore GmM/r^2 = mv^2/r : where m = mass of the orbiter and M is the mass of thing the orbiter is orbiting GM/r^2 = v^2/r GM/r = v^2 we know v =(2 x pi x r) /T therefore GM/r = (4 x pi^2 x r^2)/T^2 T^2 x G x M = 4 x pi^2 x r^3 r^3 / T^2 = Gx M/(4 x pi^2) for a given object like the sun or earth M is constant therefore if we assume G X M/(4xpi^2) is constant and thus let it equal K r^3/T^2 = K hence we have proved keplers law!

[@jazeba.1532]

nerd.

[@ozgeozcelik8921]

awesome

[@nonominox]

One of the best things I learnt from these videos (including Physics, of course) is that I've been pronouncing the names of most of the scientists wrong!

[@ThatOneOddGuy]

U have explained all this in about 20-40mins and this took my school 3 weeks to the same stuff

[@beepbeep1836]

I love her sooo muchhh

[@fasihamohammad8811]

Could you make a video only on the topic of gravitation ??

[@batowner1]

4:00 Good mythical Morning

[@BillySugger1965]

Great stuff. I see how to prove Kepler's second and third laws from Newton's laws, but I can't see how they prove that non-circular orbits are ellipses. Can anyone help?

[@jimmywu2648]

Will there be a session on Work, Energy and Power soon? (or more than one session) Also will there be a session on Simple DC circuits? thank you

[@Modenut]

Love the angler plushie. I wants one...

[@nono-hmd-9982]

phew! *wipes sweat off forehead*, you literally saved my life! i am having a university entrance exam and i knew nothing. well, now i know *wink wink*

[@simonmahon86]

she's a great speaker.

[@TheFireflyGrave]

Newton was a pretty big deal. Fantastic rap artist as well.

[@Deathbysnakes90]

+TheFireflyGrave For ffuuuuccks sake

[@feynstein1004]

I think that was Weird Al :P

[@1234kalmar]

My brain is mush but I enjoyed the video :D

[@GuerrasLaws]

Question. Has anyone thought of replacing "F" for applied Force with "E" for applied Energy? Eg vs Fg? Would that work? If we were to know how strong or weak the “gravity” is, then we would know how much energy is being applied from within a planet or black hole. Cause, without energy there is no gravity, magnetism, fields, waves, motion, etc. After all, Force does not exist "physically" in the same way that an object with mass does. "Force", as we know it, turns out to be nothing more than an expression to express an idea like one would use the word "Love" to express one's feelings. Meaning, Force or Net Force does not push, pull or work for that matter.

[@danimtions7964]

Listen brah gonna give u a simple example. When we have to write something in a paper what would u do use the pen or just the ink . Think about it and u will get the answer

[@cdpalmo]

my teacher is going to be a little confused when i define kepler's laws by mentioning pizzas but that'll have to do

[@chefjimmie1]

I have an idea. Let's make an instructional video series. We'll find the fastest talker we can find and then edit out all normal pauses that a speaker generally makes while speaking. Oh, and we'll use graphics but only flash them on the screen momentarily and then quickly to the next one.. We'll get lots of views but the comment section will demonstrate that nobody was actually paying attention to the topic!

[@clairevannette4972]

If only you had a pause button and speed control.

[@The1234567890ashish]

You realise this is free stuff right?

[@billbixly4332]

If you dropped a bouncy ball from a height of 1m on to cement and did this little experiment on Earth and Mars on which planet would it bounce higher? I really don't know if any one does please tell me. Thanks

[@samyanez94]

Were can I get that little Newton figure or statue (or however you call it)?

[@jeffreybernath6627]

Sir Isaac has a selfie stick! That is hilarious!

[@codswallop321]

I found this video a useful refresher of stuff I learnt some time ago. But I expect the presentation to be way too fast for someone encountering these ideas for the first time. Try slowing it down, guys.

[@usmanchughtai1751]

Cool. Didn't know there was a crash law physics

[@thebloxxer22]

Fun Fact: This equation breaks down when you reach the smallest observed/theorized particles: Quantum Particles (Quarks, Leptons, and Bosons).

[@backyard282]

3:35 - 3:56 Newton didn't add a constant because the force between everyday objects would otherwise be too strong, the constant is there just by pure definition of proportionality in math lol.

[@harekrishnaparhi7943]

can u tell me why is it is radius is squared in the equation

[@menglongyouk167]

Finally I could understand Kepler's laws.

[@jeremygarst394]

2:50 How did Newton know the acceleration of gravity due to the moon?

[@lokbai]

I love this woman

[@Andre-iy2ob]

Maneiro demais.

[@sarthakmunda3914]

Wasn't the inverse square law for the distance in gravitation derived from kepler's equation of time period for one revolution of planets around the sun??

[@TN-cx4qi]

Newton is one of, if not the most important person in history. He was so brilliant that he had a lasting effect on physics, mathematics and cookies.

[@zokunafc]

Is there a video coming that explains Einstein's theories of General and Special Relativity?

[@rohanghoshdastidar1047]

From where can I buy the bouncy in Newton head doll ???

[@jacktheripper2505]

1:08 Newton selfie under an apple tree! X-D