Kepler's Laws

Introduction to Kepler's Laws of planetary motion.

[@jonrrustolli2227]

You still helping people after 8 YEARS nice video you explained everything soo good thank you so much!!!

[@yoprofmatt]

That's the great thing about video. I never go gray. Cheers, Dr. A

[@thebluebeyond2329]

I got 90% for theory work and 100% for practicals in general physics and planning to get at least a 95% in my exam tomorrow. Thank you so much for these videos.

[@motormouthalmighty]

do you never lay awake at night and think oh I still dropped ten percent .to be honest they should have told me,that we regret to inform you that you scored minus ten percent on your lifetime test exam!I might have to sweep floors and scrub toilets for fifty cents an hour! I jest good sir! What a performance,! Imagine if you scored ninety percent with the ladies!you'd be living in Caesar's palace before your nineteenth birthday!ninety percent,? This is a very difficult subject.you didn't, even have the answers in front of you!

[@salihhassan743]

You are my favorite physics teacher

[@yoprofmatt]

Wow, great to hear. Thanks for the comment. Cheers, Dr. A

[@salihhassan743]

Matt Anderson Thank you so much Honestly I wish one day I will get master degree with you sir

[@yoprofmatt]

Sounds promising. Cheers, Dr. A

[@amitmodak21]

i fully agree

[@nehawadekar2943]

YEAH DUDE ME ALSO

[@fiddlesticks6146]

still helping GREATLY after 6 years!

[@jovannathebonana5448]

I have to write an essay about this, and when I looked the three laws of planetary motion elsewhere, it seemed very confusing to me; however, you explained this realllyyy well. Thank you!

[@lenasearcy9511]

I’m middle-aged and taking Life in the Universe. Thank you for this video. It helps me visualize Kepler’s Laws!🙌🏿

[@mryab6860]

Who else is confused about how he is writing backwards perfectly or is it only me ....

[@carlatteniese2]

Yeah, this drives me crazy too--and I can write backward and upside down.

[@carlatteniese2]

Actually, he is doing what we all do; he is writing left to right behind a piece of glass. He happens to be left-handed.

[@sup2day]

New teaching aid called Learning Glass. He's writing normally on the back of a glass pane, the image ricochet's off of a mirror placed diagonally in front of the glass, and then enter's a camera. Without the mirror, everything would appear backwards.

[@carultch]

@@carlatteniese2 You can see that his wedding ring is on the hand he isn't writing with, which is traditionally worn on the left hand. He is writing with his right hand, and from his point of view, he is writing normally. There is a mirror between the glass board and the camera, that inverts the video footage.

[@stevegrivas1460]

The video stream could also be digitally reversed before display.

[@user-jq4el7mi1v]

2020/7/2 searching for important adds to my E-class project and I feel like I found a treasure in this video.. Thank u veeeeery much mr.matt Anderson best lecture ever 😘👏🏻👏🏻👏🏻👏🏻

[@yoprofmatt]

حسين علي عبد الجليل كاضم, You're very welcome. Glad you're enjoying the videos. You might also like my new site: www.universityphysics.education Cheers, Dr. A

[@animeshdey634]

Your explanations are so smooth!

[@yoprofmatt]

Animesh, Great comment, thanks. You might also like my new website: www.universityphysics.education Cheers, Dr. A

[@nanaaou]

Idk why but when you talked about helly's comet it really made me enjoy the lesson more because it's so crazy that we might be able to see it in 2061, so crazy! I'm really enjoying this

[@billywilliam7747]

Crystal clear explanation - Great thanks Prof Matt Anderson

[@suleimanmuktari5780]

So grateful, cant thank you enough. I wish was thought this way in Secondary school days.

[@akashbansal6699]

awesome explanation an osm trick

[@JaS-rm6zn]

you are the best !!!! perfect explanation thank you Dr.

[@yoprofmatt]

Ha a, You're very welcome. Glad you're enjoying the videos. You might also like my new site: www.universityphysics.education Cheers, Dr. A

[@bhartihatti3702]

I am so thankful for your great lectures. Was very helpful even after 9 years love from India.

[@Since-lk6kw]

Sir you are a very good physics teacher

[@fallenembers2518]

That's awesome you lecture behind a smart glass with a bright font

[@saqib3s]

Thank you very much. I am your fan + student from Oregon.

[@raiedahmednishat8883]

sir, you're amazing thanks

[@yoprofmatt]

Thanks for watching! Cheers, Dr. A

[@MAX-by8zd]

Your the best physics teacher

[@seanandrews4916]

My 1st year engineering lecturer made me hate physics, you have restored my love for physics

[@nandhanfrankey7994]

thank u very mach for the explanation.....that was awesome...thank u.....

[@ahmedghareeb9028]

All my respect to you sir from Egypt

[@yoprofmatt]

Hello to my Fandersons™ in Egypt! Thanks for tuning in. Cheers, Dr. A

[@kundanpoudel]

You are great sir Love and respect from Nepal 🇳🇵 🇳🇵

[@yoprofmatt]

kundan Poudel, Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A

[@alexrosellverges8345]

Really cool video, thanks a lot!

[@yoprofmatt]

You're very welcome. Keep up with the physics! Cheers, Dr. A

[@haripriyapadhy1172]

Very notch way of teaching

[@sundayfunday3644]

well explained. thank you.

[@austine4845]

I love Ur teaching

[@sivakumar-oh2if]

Sir u r amazing but we need deep and deeper explanations and examples of theroms thank u sir yous obediently student

[@yoprofmatt]

Thanks for the comment. We're working on new stuff. Cheers, Dr. A

[@ishac18120]

@@yoprofmatt Hello sir.. The whole video and the concept was crystal clear to me but there is this one part that I didn't understand. 08:55 is the part.. How did we reach to this equation and why did we use V?

[@ishandwivedi4811]

@@ishac18120 Since the planet is rotating around the Sun, the planet have a circular motion and a centripetal force is acting on the planet. The magnitude F of the centripetal force is equal to the mass m of the body times its velocity squared v 2 divided by the radius r of its path: F=mv2/r. V is the velocity at which the planet is moving so we use V because their will obviously be a velocity when something moves! Hope this helps! :)

[@sirdragrimverma777]

Wonderful sir love from India

[@user-lf3rd2is1v]

You are the best teacher. You change my thoughts . Thank you

[@yoprofmatt]

M 07, You're very welcome. Glad you're enjoying the videos. You might also like my new site: www.universityphysics.education Cheers, Dr. A

[@pralaypati3700]

Cheers for Dr. A thanks Sir for the great explanation

[@yoprofmatt]

Pralay Pati, You're very welcome. Glad you're enjoying the videos. You might also like my new site: www.universityphysics.education Cheers, Dr. A

[@jefftube58]

For the first time I can understand this stuff. Thanks Prof. Anderson !

[@miranairacebethlockheart3654]

Thank you so much sir!

[@hi-techman8449]

Am I the only one who thinks you look like doctor Strange without facial hair!?

[@juanpedraw4245]

YES! I thought the same thing too.

[@xixizang2798]

No he don't

[@hi-techman8449]

@@xixizang2798 haha...give him a red cloak.

[@hi-techman8449]

@@lordlwando wow I wrote that comment in my 11th grade...now I'm in a university.

[@musicinveins2181]

Love u sir tq so much this helped me literally best teacher 😄😄😄😄😃😃😃😃😃😃😃😃😃😃😊😊😊😊😊

[@yoprofmatt]

You are very welcome. Cheers, Dr. A

[@NomanKhan-qy6ey]

Please solve multiple choice questions related topic

[@mdasfaque6063]

You just make this subject very easy and interesting. Thanks

[@yoprofmatt]

Thanks for the shout out! Cheers, Dr. A

[@arishnasingh2533]

this is extremely helpful... for students post covid

[@yoprofmatt]

Glad to hear it. Cheers, Dr. A

[@triton62674]

Fantastic

[@pie9967]

This is really helping me for my 10th grade

[@fairoozzahin4414]

Top notch explanation

[@yoprofmatt]

Thanks much. Cheers, Dr. A

[@rajendrapharande5897]

Thanks sir Which Technique is used to write on transparent board.

[@allistiles2948]

i am only 13 but i thought that is video was very easy to understand thanks :)

[@rkreike]

Q: When a planet moves a around a star, with different velocities at it’s perihelion and it’s aphelion, does that mean that time on that planet goes slower or faster, because time goes slower when an object moves faster?

[@oneinabillion654]

Excellent explanation sir

[@yoprofmatt]

Thank you. Glad to be of help. Cheers, Dr. A

[@Sammy_360]

Terrific explanation Sir, I wish you were my physics teacher

[@yoprofmatt]

Thanks. I'll just try to be everyone's physics teacher here on KZbin. Cheers, Dr. A

[@certifiedloser2112]

thats a cool looking board

[@julienelson6506]

Thank you. It makes a lot more sense now.. i am not completely there but getting there, slowly. (Small distraction: How does that "chalkboard" work? Wouldn't it appear backwards on our side?)

[@bobbyplay2898]

Lol I want to know the same thing

[@klemli4599]

I think it's just video itself mirrored vertically!!

[@Heymanvi]

More than class ..iam thinking about how they shoot .like wr is camera direction.....

[@justinchen207]

lovely story about the comet

[@atekka1]

Good day! I'd like to ask, Kepler's 3rd Law in valid only in our Solar System or another (solar) systems, too, (most likely) pls ? And how about the g (constant 6,67 x 10^-11) ? Thx

[@carultch]

Planetary system is the general term for a group of planets orbiting a parent star. The solar system is the sun's planetary system specifically, since Sol means sun. Kepler's third law is valid in other planetary systems as well, but only among the planets that orbit in that particular planetary system. A hypothetical planet orbiting the sun at 8 AU would have an orbital period of 4 years, which fits Kepler's third law with the planets of the solar system. However, don't expect a planet orbiting a completely different star at the same 8 AU distance to also have an orbital period of 4 years. It is uppercase G that has a value of 6.67e-11 N-m^2/kg^2, and to the best of our knowledge, this is a universal constant. Lowercase g is gravitational field strength, and is specific to an individual world.

[@robertcoggin3366]

I'm probably not going to make Halley's next appearance, so that's kind of a bummer

[@rahimmazouz574]

شكرا.

[@paulcrooks4467]

Thanks Matt

[@yoprofmatt]

Paul Crooks, You're very welcome. Glad you're enjoying the videos. You might also like my new site: www.universityphysics.education Cheers, Dr. A

[@mst7155]

Equal areas in equal times is a bit imprecise! It's true only if the origin of the revolving positional vector is the Sun, not the second focus.

[@prashanthkumar0]

sir do you write with left hand and flipped texts ?

[@Yeti-Lift]

I was also wondering how its done. Wether he has backwards whiting skills or if there are clever camera tricks @ play.

[@lukejeronimo6040]

Pls I have 2 questions: 1. If the sun attracts the earth, and the earth attracts the sun, then why do they not collide? 2. Why do we use Kepler's constant for all bodies in our solar system if they do not all move in a circular orbit but the formula for Kepler's constant includes 4π?

[@justinnwaeze957]

Thank youuuuuuuu

[@fanpageofvikasdivyakirtisi6031]

Unbelievable sir Namaste🙏 from India🇮🇳

[@ameerhamza4816]

Finally I understand Kepler's laws

[@yoprofmatt]

Great to hear! Now grab your telescope and head to the hills. Cheers, Dr. A

[@acinorevbonik3147]

Matt Anderson I wish I could do that😓

[@ThehouseofcricketVNR24]

Professor but what is the reason for eleptical orbits?

[@cienciamente4600]

the question is...Why not??

[@ishaanvkumar1576]

The orbits are elliptical because the speed at which the planet's are orbiting the sun prevents them from falling into it , but due to the high speed , they kinda get flung off from the circular orbit and after travelling for a some distance the speed they got after flinging off(idk if am I using the write word here) is lost and the sun's gravity is able to pull them back

[@homayonreah1955]

How the sun"s mass was calculated. (I understand that mass of earth could be calculated by considering "average" specific mass on earth.)

[@sanjaySingh-iq7hs]

Nice editing

[@yoprofmatt]

Thanks, but not sure we had much editing on this one. Cheers, Dr. A

[@bushratufail7139]

Your explanation is so simple😍❤..but i can't understand how radius can be same as semi major axes for elliptical orbits..

[@sup2day]

Your question regarding the semi-major axis is astute but it turns out that the semi-major axis is the same for a circular or elliptical orbit having the same period. The key is that in an elliptical orbit, one can no longer state that the semi-major axis is equivalent to the radius. It must be defined as 1/2 the length of the entire major axis of the ellipse. Since the Sun does not occupy the center of an elliptical orbit you must shift your perspective away from the circular image provided by Professor Anderson, and envision an ellipse with the Sun at one of its foci. In this case, the Sun’s position has nothing to do with how we measure the semi-major axis.

[@sup2day]

Professor Anderson has simplified the problem to that of the Earth in a circular orbit around the Sun. This allows for two simplifications. First, the radius r can be assumed to be equal to the semi-major axis. Second, the Sun’s mass far exceeds the Earth so that it can be assumed to be at the center of the circle. There are more general derivations based on the center of mass for both bodies but my attempts to link you to them have been blocked.

[@hankitty444]

Why do I feel like you are writing the letters backwards and doing it perfectly? 🤯

[@user-gz1nv6nw3q]

I think he writes it regularly (from his perspective), and then inverts the video.

[@hankitty444]

@@user-gz1nv6nw3q Could this be real or is it just your point of view?

[@_graysonm]

Guys, how is his inverted writing so perfect?

[@hanumansharma3723]

An great sir (he can write left

[@marylzote6126]

Sir i dont understand the part where 10:53 T² = 4pie² by GMs r³ turns to T² proportional r³ ? I hope you do have the time answer my question.. , sir.

[@Rishika89]

Thanku very much sir 😊😊☺.

[@yoprofmatt]

Tanya Shreee, You're very welcome. Glad you're enjoying the videos. You might also like my new site: www.universityphysics.education Cheers, Dr. A

[@Rishika89]

@@yoprofmatt 🙂🙂

[@Rishika89]

@@yoprofmatt 🙂🙂

[@n.mokshithreddy1189]

Sir what kind of device did you use to write on please tell me sir 🤔🤔🤔

[@adminliceomaffei6835]

learning.glass

[@hendriklohad631]

I believe that Newton's law of Universal Gravitation was derived from Kepler's laws, so 5:01 you said "Kepler's laws are derivable from Newton's law of gravitation" is somewhat inaccurate. With that being said, I still love your videos!

[@carultch]

Kepler's laws are derived from Tycho Brahe's observational data. Newton came up with his law of gravitation to prove Kepler's laws, from the fundamentals of how he believed the mathematics of gravity would work. The multiplication of masses in Newton's law of gravitation is a direct consequence from the empirical observation that force of gravity is proportional to mass, and Newton's third law that gravity like all forces is a two way street. The inverse square part of the law comes from the way a field with no divergence would spread out in space from a spherically symmetric source. Putting these together, we get the M*m/r^2 part of his law of gravity, and the big G is a constant of proportionality to make the units work out. Cavendish's experiment, over a century later, was the first to measure the big G.

[@bannana8811]

how does he write in the board? Does he write backwards ? Or is it a mirror trick?

[@agekjrgardpayoutube2593]

Ban Nana I’m pretty sure this is a mirror trick.

[@Worldmemes4]

Matt Anderson... remember the name👊

[@Monkeysal07]

Can someone explain why the sum of the forces add up to Sum(F)=(Mp*V^2)/r ??? Thanks

[@dronpatiyat8672]

centripital acceleration = v^2/r accordng to 2nd law of newton f=ma hence centripital force=mv^2/r

[@driftguy1829]

How log does it take to write like that and do it like it was normal Jesus Christ you have m full respect

[@MaulikSrivastava]

The video is mirrored

[@azeditz4979]

I wanna be in his class

[@PrepYourself]

♥

[@yoprofmatt]

Science Tube, Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A

[@PrepYourself]

Matt Anderson Professor, fallen in love with your teaching, the lectures are engrossing. Thanks for the website link.

[@mastertim1909]

I like your . Marker

[@yoprofmatt]

Thank you, I like it too. Cheers, Dr. A

[@pokemoner_365]

Im an Indian student, but the way our teachers teach us is like they want us to memorise the things and not understand them. Everyone is in a rat race to remember everything for their exams but nobody clearly understands things. But i have to say american teachers do explain well along with yt indian teachers unlike indian school teachers.

[@saquib7484]

How you write

[@mkarthik5894]

Sir...how can I practice mirror writing like you

[@carultch]

He's not actually writing backwards. He uses a mirror between the camera and the transparent board, to film this. Students who see him teach in the flesh, will see the backwards writing on the board. On a screen to the side, they see a live feed of the footage you are seeing, so that the writing is legible.

[@mkarthik5894]

@@carultch Thank you

[@hbk4984]

He write in reverse or there is kinda edit

[@spad1782]

@Abdullah Orilonise It's a lightboard so he either mirrors the video while editing or has some kind of mirror in front of the camera. From his point of view he is writing normally.

[@JenniferLeja]

Poggers

[@callmemina6838]

I wish u are my teacher

[@sarajann5493]

Hi, how do write flipped?😅

[@yoprofmatt]

www.learning.glass Cheers, Dr. A

[@mikesmith7249]

Why has no one commented on the fact this guy is writing backwards

[@khirgis7224]

1

[@gavster_killa4591]

I've actually heard there was a major flaw in keplers laws tho is that true

[@yoprofmatt]

G MAN, Can you explain a bit more what you mean by that? There are, of course, "flaws" in Kepler's Laws that are only fully explained by general relativity, but it sort of depends on what you call "major." Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A

[@asiaramay6148]

Why derivation for circular orbits when we know that orbits motion is elliptical m???

[@yoprofmatt]

Indeed you are correct. We're trying to simplify the physics. Circular orbit is an ellipse of ellipticity = 1. We approximate this to make sense with Newton's laws for circular motion. Since Earth is in a near circular orbit, it works great. Cheers, Dr. A

[@aiueokaya]

How could you write backwards ?

[@yoprofmatt]

GENDAI UI, Not writing backwards (I'm not that talented). The board is called Learning Glass. You can check it out at www.learning.glass Cheers, Dr. A

[@rajroshan6070]

Hii i m Indian

[@patienceobongo]

The Sun is moving, not at a focus.

[@shreeyapatel3336]

how would I solve this question: if Kepler's constant for a STAR is 6.00x10^-12 s^2/m^3, what would the mass of the planet be in scientific notation? I've been struggling about it for a while, and can't find a way to isolate mass in the equation with no info on the Period or the Radius: Ta^2/Ra^3=Tb^2/Rb^3. Thank you...

[@sumansuman6715]

What the hell you are writing with ?

[@soulmusic4265]

he is writing inverted😱🥴

[@BornEnlightenedNoSell]

Ce-a mai buna cultura de fructe și legume ,deci știință este greșită s-au plicata într-un mod greșit s-au direct de care unii dintre colegii mei de la NASA 🎉,descoperirea fraților este că mergem după soare ☀️ daca tranzictia nu este modificata după traiectorie ascendentă ea s-e modifica schimbând in Epigenetica statusul comenzilor, comportamentul oamenilor de zi cu zi 😂🎉, totodată frecventa de rotație este schimbata de umbrella academy😂

[@SteveWideawake]

how can you see the same stars in the night sky when the earth is on the othe side of the sun in the orbit?

[@KRATOS-dq6sd]

Because gravity bends light so they appear “out of position”

[@sup2day]

Some you can, some you can't. It's about geometry. The Earth is tilted on its axis. This allows different looks at different times of the year. Polaris is due North so it is always visible in the Northern Hemisphere and never visible in the Southern Hemisphere. The Southern Cross is due south so it is always visible in the Southern Hemisphere and never in the Northern Hemisphere. The Constellation Aquarius lies along the plane of the ecliptic (the plane our planet orbits the Sun in). From 16 Feb to 12 March the Sun will block portions of Aquarius. This would be in daytime. At nighttime, you're predominantly looking away from Aquarius and may only see portions during dawn and dusk.

[@patrickzhao9072]

when your teacher never really explained how the theorem really means, you have to find some other teachers on youtube....

[@eliplayznow2043]

nice voice crack lol