Newton's First Law of Motion

[Kricardose]

I am very happy to see the vidoe Introduction to newton's first law of motion. Inertial frames of reference after you give this

[bebeheuy]

I Love The Video Introduction to newton's first law of motion. Inertial frames of reference It Can Increase My Knowledge

[bebeheuy]

I Love The Video It Can Increase My Knowledge Introduction to newton's first law of motion. Inertial frames of reference

[Mjhond]

Steady I Really Like This Video Introduction to newton's first law of motion. Inertial frames of reference

[jalene360]

these newtons laws really helped me.... thank you!

[czag777]

i think this guy is happy

[VisualEase]

visual-ink.in



[mrfrankincense]

If F=ma and E=Fd so isn't kinetic energy; KE=mv^2? of course this is not the accepted formula, can anyone explain why?

[mdias5907699]

@mrfrankincense I don't know if you've taken calculus yet or not, but the reason is that "a" is the derivative of "v" so it follows then that "v" is the antiderivative of "a" (the reverse derivative) which is 1/2v^2 and then this term replaces "a" in the formula F=ma, giving F=m x 1/2v^2 or F=1/2mv^2. Hope that helped :]

[mrfrankincense]

@mdias5907699 I hadn't learnt of calculus yet when I posted this, since posting I discovered the reason why, but thanks anyway. The fault lies with those who promote the following incorrect statements: v=d/t a=v/t

Are these usually taught at university undergraduate level?

[mdias5907699]

@mrfrankincense well those statements are true when written as v= delta "d"/ delta "t" and a= delta "v"/ delta "t". Delta in this context simply means "the change in" the associated variable, which makes sense : the change in distance over the change in time = velocity and the change in velocity over the change in time = acceleration. Another way to think of it is that if you draw a line graph of the distance vs time, the slope of that line is the velocity, and the slope of a velocity vs. ...

[mdias5907699]

@mrfrankincense vs time graph gives you the acceleration, and the definition of slope is the change is the value it represents over the given axis's. And yes these concepts are taught at the university undergraduate level, at least in the US they are, I know because I'm actually taking physics with calculus 1 right now actually.

[mdias5907699]

@mrfrankincense I'll also add that the derivative of a value gives you it's slope, which is why the previous statement explaining how K=1/2mv^2 is arrived at. In a physics with calculus class, these concepts and formulas are actually explained as to how they are arrived at etc, while a physics without calc class you simply will be told to memorize it or just be given the formula, so you could say you learn more about how physics works in physics with calc, even though I will say it is harder :(

[adonisSrabon]

you are Great bangali :)

[RTYB]

I love this guy, he just saved my life!!!

He explains better than certain (my) teachers...

[nagimayssa1]

hey men this mass is in the line of zero,and all started from zero,unit or gravity is zero,so when the mass is at rest it will stay atrest,when you spin it it will stays in motion,at the line of zero

[deesharkz]

love this guy

[demonshubham]

wat a genius and excellent teacher he is.......

[Yohannesiscool]

People are crazy, Khan is only here to help you guys. You are the best and keep up the good work. I love all your videos!!!

[crissohlin]

The law is an object at rest tends to remain at rest unless acted on by another force gravity being an outside force pulls that apple down and maybe if you werent retarded then you would know that a mass of an object determines its gravitational pull with earth being a large mass it has gravity dumb shit.

[GermanPeoplePerson]

thank you so much! you're very good at explaining this, i will definitely be looking towards your other videos for physics help.

[MsChillyGirl9]

thnx i have a quiz 2morrow at this,, thnx it really helped!! :D

[Zecojr82]

take it easy u speak to fast :P

[wemosam]

When your in a vehicle, the dice doesnt move for the outside viewer, it stays stationary, while the car moves. same if you put a book on the dashboard, and take a sharp turn, it appears to slide sideways to the people in the car, but from the frame of outside the car, the book isnt moving, it simply stays stationary, while the car moves

[gambiatzu]

Its all wrong. Its called laws of Cuck Norris

1) Inertia: Objects will remain at rest or in a uniform motion in a straight line, unless acted upon by Chuck Norris.

2) Force, Mass, Acceleration: The acceleration of an object depends upon Chuck Norris and the magnitude of his force.

3) Action & Reaction: For every action there is an equal or opposite reaction (except with Chuck Norris, there is no such thing as an equal reaction, Chuck Norris is always one step ahead).

[IJvevo]

@gambiatzu What The fuck is cuck norris? ()-0

[northkato]

@gambiatzu Liam Nieson has replaced Chuck Norris.... didn't you get the memo?

[drunkhitchhiker]

hey, that apple in space should be moving towads me due to the Newton's gravity law!

[TheDrakaan]

So glad I found these, recently took a liking to Physics. Found it damn hard to find something that didn't presume prior knowledge of something or other.

[Bella329]

bahaha "newton i just disproved your rule"

"oh well there's a thing called gravity..."

"Newton! you need to not make up things!"

I love how I always get a kick out of all your videos.

[m92singh]

kindda confused me.. i guess all i needed to know was that it stays in motion or stay at rest unless acted upon by an external force.. the inertia bit I dont get and confused me since I don't know what it means.. :/

[WoZeR1]

I have a better example to help clear up your in motion stay in motion law. Instead of using cars use space. Space has no friction so if something is in motion it will stay in motion, unless it is acted on by something else.

[MapleOryDude]

You know what: I'm gonna subscribe to this account

[3alexander1991]

time is the constant force 

[misslahti]

I freakin' love this guy!!!!!!

[fhs31053]

i thought i could learn about more of this but ur disproving everyting i know becuz ur just saying newton is stupid well did u know they made his laws way before he died and a law is a law becuz it was proven and it is the truth and cant be proven wrong

[katibear6]

@fhs31053 this .... this doesnt even deserve a response. why am i responding. wow, kid.

[felix242]

@fhs31053 how is he saying "newton is stupid"? He's saying what an idiot would say in response to Newton's laws of motion.

[naruto2710]

@fhs31053 ur stupidity astounds me.

[naughtydevil02]

WINDOWS!!:)

[kanashiihanashi6]

his voice charms me, before i go to sleep i open my laptop then watch this videos because his voice are so charming......uhhhhh

[misslahti]

@kanashiihanashi6 Right!! I may have a crush on his voice and sense of humor =D

[naruto2710]

@kanashiihanashi6 u better be a girl

[thedancegroupstudio1]

Are you Related to newton??! this video is great thank you

[TheLordlan]

very good explanation it helps me alot with my physic test :D

[libertysunbeam2]

even thou your looking at a cenimeter of distance between stars for example your actualy looking at millions and millions of miles even at fast speeds objects still take time to travel large distances.

[libertysunbeam2]

if an object is sitting on the earth and the earth is traveling constantly around the sun=the earth+object are traveling around the sun.

[libertysunbeam2]

objects constantly move because all objects age and become gaseous over time/decay.

[libertysunbeam2]

the only reason why things look to be moving slowly is because of do to the size of the earth and the "slowness" of the moving stars its difficult to get a bearing of speed. stars look to be moving slowly simply because distances are compressed and large distances look smaller the further away. its generaly the observer moving slowly across the earth that gives the illusion of the earth moving slowly as the greater the distance the more time it takes to travel across at the same relative speed.

[libertysunbeam2]

i would say newtons first law is completely incorrect simply because things dont stop moving. the earth travels constantly around the sun and rotates as well as things wouldnt age if they "rested". even a watch at a state of "rest" still moves forward in time. all objects age and decompose. if the earth were resting or something on the earth, daylight wouldnt change as well. objects dont "rest" in my opinion acceleration and change are constants as well as watch time.

[northbeachfilms]

This movie is King!

[OoOIvaNOoQ]

@ Shahafonik I dont agree with you :D cars do obey Newton's law

[tasneefm]

This is fascinating, please keep it up and please keep it basic like this for dumb people like me lol.

[dalcde]

@Shahafonik He is not talking about the car. He is talking about the dice in the car, which gives two frame of view: Outside the car, where the dice doesn't move, and inside the car, where the dice seems to move because you moved with the car.

[nrostaie]

Sal's fav word -> 'Intuitive'

Lol

[mahela1993]

@nrostaie A very good favourite word.

[Fre3ZinRain]

what program do you use?

[shaiwn]

lol 2:50 that hand isn't bad

[lmao0o0lol]

I made my first youtube account just to comment this: BEST EXPLAINER EVER!!!!!

[aashish7kumar5]

Look, I know your videos are good but the part where you dropped the apple, and you said it was disprove of newton's first law, i advise strongly that you watch the Eureka Episode on inertia, just type eureka inertia on youtube\

[SKH93]

you rock!!

[crystalidx]

You are very talented at teaching!

[MrSkeletonMan1]

thats cool ME AND THE APPLE

[Qi609]

Thank you sooo much!

[moderator500]

really educational

[pjaf94]

uhhh hey guys, yeah i loved the first episodes on projectile motion but im really looking for a better explanation on inertia anddd such...cuase you see. "suh eyeeezik" should really be praisedd more often. not so much for his rape accusations but more so his theory's on gravity and MASS

[mrhnm]

Friction causes objects to stop. In a frictionless enviroment an object in motion would continue to move until acted upon by a net force. This is called inertia

[jingyihlee]

dammm nice mouse writing i cant even write right like that 0___0

[HaloPCVideo]

good explanation, thank you.

[SteroidsR4success]

so there actually is a what you'de call imperfection to our earth's orbit, but obviously it isn't nearly the magnitude of say dropping an apple from where you're standing to the ground. Hope I helped, I tryed not to use words to big and if you don't know what the term "Inertia" means feel free to go to dictionary dot mom and look it up.

[SteroidsR4success]

In simpler terms - Any object contained within an inertial frame of reference (the object being in a intertia, the frame of reference being the factor that is effecting the objects inertia) will not be effected unless the frame of reference acts upon it. There is always a frame of reference that'll be acting upon the object, but it depends how detrimintal the magnitude is. For instance, our planet stays in orbit but it actually does move a couple of feet closer to the Sun every year or so...

[Sitara04]

thanx for the vdo

but i didnt get the inertal frame of reference thing :S

[DeflocculatedDentist]

"I want to give you an intuitive direction as to how this isn't intuitive" haha

[turi73]

great video bro.God bless you

[kkurian10]

Sal, you have caught a cold LOL

[teched246]

Can someone please answer something for me?

Laws exist - FACT

Laws comprise, are behind, or are underneath other laws - FACT

Because laws comprise, are behind, or are underneath other Laws they are the reason other Laws exist's - FACT

Are any of these false?

[JinzMag]

Actually Newton stole the theory of an object at rest from Galileo because Galileo had a theory of a frictionless world. But it was for the fact that Newton got the idea from Galileos books.

[hala5150]

Atom heart mother, pink floyd?

[Nutterbutterz95]

I love how he "tried" to disprove Newton's first law and starts back-sassing Newton.

"Look, I didn't do anything to it."

"It was gravity, gravity was the force that makes it accelerate.."

"Stop making stuff up."

[CrazzzzyKid]

Life is an apple.

[hamidjabbarkh]

how many mark you got in physics ?

[Friffle84]

Newton's three laws of motion explain everything.

[Nutterbutterz95]

I find it interesting that no matter how much we revolutionize physics, and step BEYOND classical Newtonian physics, Newton's three laws of motion stay the same. Crazy.

[zZsoccerHz]

ILY

[anthonychemistry]

you mean, the frame of reference is like a system ( inside the system is the object) and the observer is the surroundings..But, the condition tells u that whatever happens to that system (any motion occured) , the surrounding is unaffected...So its like in a 2 dimension, where the 1st dimension (system is changing ) and the 2nd dimension is constant. Is that correct Sir Sal?

[b1gr1g]

I love your videos dude!

[parinp23]

HEY FUCK YOU! SCIENCE ROCKS!

[johntkucz]

Science RULES!! Science the best. sci ftw. I love checking out the massively marked-down comments...lol they're usually quite amusing.

[74dorset]

burke is that you

[Burkieeee]

emm hello?

[2pacoverbig]

@johntkucz fuck sicence maths is the best

[srspiewarmer]

@2pacoverbig Learn to grammar first

[johntkucz]

@2pacoverbig I agree mate, I cluster math and science together (math as a science) it certainly is, is it not? booya sci FTW!!! (some cool artsy things like inception with complex layers are interesting though but I only consider them intersting because of hte mathematical-like cerebral layers of science put into it!!

[johntkucz]

@2pacoverbig Math is awesome truth in the mind (especially recreational and non-engineering non-applied math) and it is indeed quite awesome; the empirical data in non-math science is awesome, too. I'm focusing on doing a math (and some science) knowledge sharing vids. good times.

[superstevo15]

heard of the force of gravity?

[laputahayom]

do you mean relative to an stationary observer

[phil7436]

i mean how long does a moving object remain in any point in space.

[laputahayom]

0 seconds because to get from point a to point a is

d/v=t

therefore

0/v=0

[phil7436]

so the object was there, but not for any length of time?

[laputahayom]

yes, for original question to have a non-zero answer you need two points.

[gan2ws]

@phil7436 that means the object has never been there..lol.

[rabia22p]

i wish i found this earlier, i have my final physics exam tomorrow :((

[roflolsaurus]

did u pass ur exam?

[MMMMMMLLLLLLGGGGGG]

Newton's First Law of Motion:

If the forces on a mass are balanced (no resultant force) :

if it is at rest, it stays at rest

it its moving it keeps on moving in a straight line at a constant speed till a force finally reacts on it

[Siljinn]

Actually no. Newton's First Law only indicates that a mass which isn't affected by any force will stay at rest or keep moving in a straight line at a constant speed.

[mrdm93]

looks like a pickup truck so ill go with a pickup truck

[rasmusir]

Lol, I like his hand xD 4 fingers and no thumb xD

[johndoe747]

this like is not good

[Winsunn307]

Thank you Newton, thank you even more, Sal, for doing these videos.

[alsonuali]

as i havent got that much brain to understand from textbook, this video was quite helpful for me....thanxxx khanacademy

[Sharp12]

lololol i love this one. Newton you need to stop makingn up things. Just because your law doesn't make sense doesn't mean to make artificial forces in the universe

[halo3gamer808]

thanks dude i searched it up on google but it was to hard to understand you made it simpler. nice vid man. and i finished my homwork : D thanks times 2

[alsonuali]

he is teaching or making jokes of physics....???

[HerrGeneralVonBraun]

english is needed to understand this video as well alsonuali

[alsonuali]

ya man...everything went over my head....bcoz i m not an english speaker and i dont even know english....but what i know is enough for me...i m at least able to communicate with a person who knows english....anyway...if u r happy...keep going like that....

[illumantiNWO]

Can anyobody please tell me newtons third law of motion action reaction for the following? there all in relation to high jump.

1.(Run Up) Leaning in , running in J shaped curve

2.(Take Off) Pushing downwards on the ground

3.(In the Air) Rotating trunk forward

4.(Landing) hitting the mats

If anyone knows the answer please tell me I really need the help as my teacher hasnt even explained it to me properly :( im at Tafe and its important

please asap

[maruahmed]

thank you

[BearsFan054]

This is awesome stuff. You are a great teacher better then any of my profs I have now. Keep up the good work!

[Denisse2089]

i have a questoin. how the sigma expression is connected with the first newtons law? i hope to get some answers....

[terafaithpilkington]

I liked this video, I am studying this and it helped me alot. Thanks! You are a good teacher.

[jtlangel]

I was laughing when you said Newton was making up stuff.

[nettosoul]

Tq 4 clearing it out. =D

But I was expecting a better visual though.

[bandgeekbassoon09]

i was glad that there was a video about newtons laws but you are really boring just get to the point of things dont go on and on about nothing

[lesterdiamond5]

Very very bad video and boring.

[bakker30]

if you dont like it dont watch it homo

[BearsFan054]

No one is forcing you to watch this stuff. Some people need help with their school work and this is great stuff for that. Sal has a very clear way of explaining things.

[colmcav]

im in collage doing civil engineering and these videos are really helpful thank you

[buddaahh]

how do u noe if u drop sumthin in space it will not move..dont always believe wut u c or hear

[ecualovo]

i found it exellent!!

[Nicksblog]

if you turn a car off while it's in motion, what will happen?

[KillzoneO91]

Well, you have to ask yourself, is the car on Earth or in an inertial space. You see, if the car is in inertial space, it will build it's velocity by operating. The car will not change speed in an inertial space if there is no force applied to it. Overall, the car would maintain constant velocity even if turned off. However, on Earth, there are factors such as Gravity, Wind Resistance, and Friction. If the car is not continuously providing a force, it will eventually come to a stop.

[kyaragm]

hey im in midle school taking physics and this video realy helped me thank you so much

[getmewildO2]

ur lessons are great!

[candybbchang]

very nice!

[flamings05]

pretty good information! thanks for the info!

[Nandine2]

you have such a nice calm voice,

[DeathByLight]

best video maker on youtube... EVER

[bradkey98765]

great work agian

[NothingIsFact]

You're doing Physics now? Oh my god, I love you. I mean, this is basic, and I know it, but I love learning more about it.

[AznLeeman]

Woot :D first comment, oh and thx ^^