Introduction to Newton's Law of Gravitation

[uhohthepopoopo]

i hate a physics test tomorrow and this is amazing review. thank you! :)

[dxdd34]

it help me for my physics exam!

[megadroidnblastoids]

hahaha i hate being rushed:D!!

[johnnytheprick]

@ mr khan of khan academy,

your windows based calculator DOES have the square function. try clicking on view (from the menu) then selecting "Scientific".

[israelsocratus]

The formula of Gravity’s creation : h*f = kT logW 1 The formula E= h*f explained the energetic reason of Gravity 2 The formula E= kT logW explained the material reason of Gravity 3 This formula describes the possibility of realization of macro state from micro state. This formula explains the conditions of gravitation, the beginning conditions of star formation h*f = kT logW , h*f > kT logW , h*f < kT logW This local gravity area is Debye : Q(d) = h*f (max) / k

[rouhan76]

your explanation is amazing keep up the good work

thanks a lott for uploading ..it helped me to clear my douts :)

[SSuperCuriouss]

PLEAAAASEEEE continue this on to general relativity and include all the math.. the vids from Stanford uni are TERRIBLE !!!!

[Chantheman5]

6 retards disliked this

[Chantheman5]

woah what has this guy done to u haters? Thanks sal ur great. I think the ones who hate you are some dumb white kids or some idiotic drop outs.

[Rorona550]

so would this some what prove that levitation is not possible?

[MrRockit98]

What degree does this guy have. I won't be surprised if he has a phd or sommin

[Whiteberry22]

Could you please make a video on escape velocity and Keplar's laws.

[omgthatscrazyx]

YAY WIKIPEDIA!

[101shonenjumpfreak]

for the love of god what are the three laws of gravity i can't find it on the internet please somebody help me that would be a big help :)

[AntimatterRadio]

Thanks for your great vid! Cool graphics program, too!

[m0zilla30]

sal is saving my physics ass :D

[jqs1943]

A gravitational force field consists of two sub fields. One is excursive which repels other worlds and establishes their orbital corridors, and the other is gravity which serves to coalesce and unify matter towards a concentric point from whence it radiates. Both fields accrue pressure starting at the plane of the exosphere but in opposite directions at a constant rate of .0735 pounds per sq. in. per linear mile of expansion. This is my theory and my calculations. Sir Newton was wrong!

[supermanuman95]

my physics teacher teached us that g is 9.8 n/kg, is that correct?

he has 6.67 x 10 (to the power of elen)

:S

[jcocabo]

@supermanuman95 Big G is the gravitational constant which is 6.67 x 10^-11 while small g is the gravitational force of the earth which is more or less 9.80 or 9.81 for fancy people.

[qaisarghauri441]

g is not gravitational force. it is gravitational acceleration

[TheMrRedPepper]

Sorry to report an error but when you do the (Mass of sal times 5.97 etc) divided by the rest, you cant transfer sal to the rite just as it is. You need to keep it as in expression such as M of Sal divided by 6.37 etc times the rest.

[SuperSonic44]

How does it feel to be able to cancel your mass?

[B1indfire]

Sal, I know this is late, but if you go to "View" on the calculator, you can change it to scientific and have a squared button =D

P.S. You sould like one of my friends whose name is Sal... just older.

[WhiffsofBliss]

Gravity may be God, as it is the ultimate creator, you know?

[jk3053]

waaaaaayayayayayayay tooo messsy get new page

[narpup]

it is funny when i thing of gravity i think of water because when thinks are liter then water they flat just like gravity

[jadae93]

"What's this big G thing?" LOL

[fasolka54]

@jadae93 G - constant of gravity

[envirocopy512]

you sound like Jason Mayhem Miller

[FooFighterFix]

Thank you. So, so much.

[Pookie791]

I love how you change colours to keep it interesting =)

[ScottWilliam88]

great video Sal, thanks for posting... and an FYI for you: that little calculator program in your windows accessories-if you go to the view menu, you can switch it to scientific notation (much more useful!). thanks again...

[lupischuckle]

This is great! I'm currently writing a paper on Newton's alchemical influences on his explanation of gravity, and this is just a nice little video that helps me to better understand the laws of gravitation so I can know what it is I'm talking about. This makes for a deeper understanding of the subject matter, and a better paper. Physics helping History! Interdisciplinary action FTW! Thank you!!

[Ambriz745]

Great work. Thanks!

[jpalmer2007]

this helped a lot... i stumbled across this literally the day we ended up going over it in class... so it ended up really helping me visualize the math involved.

[Qasimbajwaa]

"that's...exciting."

[rafuzibitch]

great video sal..thanx

[Denue]

8:33 this is one of the many reasons Sal is such a great instructor, I can't tell how many times I've had a professor try to squeeze in a 2 hour lesson in the last 10 minutes of class. God bless you.

[RarestUniphin900]

all this was was a bunch of math equations! what the heck! i am solemnly disappionted!

[naughtydevil02]

thanks a lot though this really helps me out1!!!:)

[naughtydevil02]

umm what happened to your height why didnt you add that in the distance?3m?

[GFConstruction]

you are great

[divvy1400yam600]

You start the vid. by saying that objects attract one another by a mysterious force called gravity.

You then demonstrate the value of that force if object A acclelerates around object B .

Therfore it seems to me that the 'source' of gravity is acceleration. NOT the presence of the objects. The equation F = m.A confirms this does it not ?

[WannaBeAnEE]

@divvy1400yam600 No it does not. The simplest explination I can think of is think of a large sheet (this is the space time continuum) and you place a bowling ball in said sheet (you can think of this as a planet or anything with mass really). You would observe that the sheet dips around the object. Now if you place a marble near the dip it would roll toward the object. A mass would effect the space time continuum same as the bowling ball does the sheet, and the dips are the force of gravity.

[divvy1400yam600]

@WannaBeAnEE You rascal. You read that in a book.

[divvy1400yam600]

@WannaBeAnEE You rascal. You read that in a book.

Incidently Stephan Hawkins has just been quoted as saying that gravity helped caus the Big Bang.

There appears to be no limit to to what it is tought gravity can do.

Does it really cause the tides on Earth ?

I dont think so....do you ?

[WannaBeAnEE]

@divvy1400yam600 I can assure you in all honesty I did not. Im going to have to look in on that Quote. The tides are caused by the gravational attraction between the earth and the moon.

Some food for thought though as strong as gravity is, in that it pulls you toward the earths center, it can easily be overcome. i.e. lifting a weight off the ground.

[yellowchocolate18]

YAY its in metrics =D

thank you, its a great video

[hwhorf16]

gravity is a constant

[hwhorf16]

distance squared is shown like this: r^2 not d^2

[OniLink10]

@hwhorf16 It can be either way

[DirtyBroker]

I don't get it. If you're calculating the force, why is the answer in m/s2?? shouldn't it be in newtons?

[annniey]

u r a very good teacher, thank you!!!!

how do u graph universal law of gravitation..if u have time could u maybe do a sample problem to graph?? :)

[TheCombineify]

youre a good techer

[vickiormindyb]

I asked a physicist about Newton's Laws and he said there are some that need to be "modified," whatever modified means in that context.

I have no idea if gravity was included in the ones needing to be modified.

He went through all 5 initial laws, and two or three required modification.

Unfortunately, IDK what modifying means in the context he's using it.

[zelunika]

MARQUESE95....plz b mannered he iz our teacher...and u have no right to say abt a teacher like zis....u will never gert succesful.YEAH ELECTRICAL FORCES R STRONGER THAN GRAVITATIONAL FORCES ALTHOUGH WE HUMANS R NEUTRAL SO WE DONT GET ATTRACTED TO EACH OTHER....but if some body lose one electron even the other body gets attracted to it by a greater force than gravitational.....

[TheMarquese95]

fuck u

[patilnikh]

How is anything thas has mass, and attracts is MYSTICAL?

When anything has mass, matter exists isn't that all there is to it?

[vickiormindyb]

Is it true that some of Newton's initial laws have been disproved?

Someone told me that, and he wasn't joking around. He didn't know which ones they were though.

Not the gravity law, I wouldn't think.

[fliick]

@vickiormindyb No.

Some theories that have been developed recently (I.e string theory) would cause inconsistencies for many fundamental laws of physics. However no substantial evidence has been proven right.

[kakkannon]

lol, by the way. On that calculator

go to view > scientific.

Comes with a lot more buttons, including square buttons. still a bit shit though.

Love your videos.

[realisoph]

Watch my videos and you may understand it... but don't expect to find equations.

[abigailgeli]

Sal is that my calculator You using?...hehehe. hopeing this simple questions and solutions would help me on TTC test!..thanks....

[Johnjpcoc]

Thanks sal. U are the best .

:D

[philster00700]

You don't want to disclose your mass...wow...just wow.

[otuonyec]

.......u sound simple minded...Its a joke dude...if u watch the rest of his videos u'd understand he has a sense of humor >.>

[otuonyec]

@philster00700 ....and if you paid any attention...It was better to leave his mass as a variable as it helped prove that g = 9.81 as his mass just cancelled out

[Kosekans]

otuonyec pointed out the real reason for leaving the mass variable and philster00700 ... you're ... wow ... just wow... xD

[Abdelrahman999]

thanks alot

[pau13pdm]

thank u sal

[dr9106]

o yea and for DaAfterburner, this is not a video for you, this is for people intrested in learning some physics, i can see you are surely ignorant, and lack maturity to have respect for other people's work. i can also see you are clearly not fit to even conceptualize the defination of physics, i pitty you.

[dr9106]

you people are two suck up, here is someone trying to teach something and all you ppl do is complain. i wanna see some of you even try to do better. Thanks for the explaination Sal, you cleared up some confusion.

[johnnytheprick]

@dr9106, he talks to fast.

[xlwaiyiplx]

i think sal is probably fat

[xlwaiyiplx]

huh? ok... just calm down angry man. we just want to learn some physics

[Rev4587]

...yes?

[gregrutz]

1:40 "accelerating down toward earth"?

There is not "A" in your equation.

You are not accelerting if you are standing still.

[yuehswind]

You are. If not, if you accelerate upward, you will have no acceleration downward. You are always accelerating downward. There is just is YOUR force you apply to keep yourself standing and the force of the ground below you. You are accelerating. Your VELOCITY is 0

I am using my sister's account. Do not reward her.

[gregrutz]

acceleration is the change in velocity with time.

If velocity is 0, acceleration is 0.

He keeps saying, 'figure the acceleration"

A = acceleration

His formula is F=m1-m2/dsquared

There is no A in the equation he is working on.

[portugesesardine]

lrn2integrate and manipulate units, lol

[qskyq]

well... if you can stand on ground, there must be a force pushing you against the ground, and since F=ma, there must have an acceleration. the reason you are at rest on the ground is that the ground also pushing you upward with the same amount of force that pushing you downward, thats called the Normal Force.

[qskyq]

F = G(m1m2)/displacement

yup there is not clearly showing there is an acceleration, but if you cancel out the units, you will find out that the answer's unit is Newton. since Newton is the unit of force, and force is the product of mass and acceleration, you can assume that the answer contains both mass and acceleration. And what he means to find the acceleration is to find the force, and then find the acceleration.

[qskyq]

Since he is not telling his mass, he calculated F = 9.81*m, and you know F= ma, if you combine the equations together, F=F so 9.81*m = ma, then cross multiple m, and you will find out a = 9.81

[Kingarthur305]

I got a test tommorrow and this is the last chapter included in that test. Thanks man

[karandharaiya]

hey,sal,do your videos provide insight into igcse syllabus as well??i'm an igcse student thats why.well,for me,you rock,your teaching method is absolutely simple and straightforward,thank you for helping me!

[kayispsyko]

thank you for your help...it helped for my test!

[purelystr]

Thanks for this video. Excellent insight on the law of gravitation proposed by Newton.

[shepardfilms]

you can make your calculator a scientific one