Deriving displacement as a function of time, acceleration, and initial velocity | Khan Academy
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- Опубликовано: 2 ноя 2024
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Deriving displacement as a function of time, constant acceleration and initial velocity. Created by Sal Khan.
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THANK YOU FOR MAKING THIS VIDEO!!! My school board took deriving equations out of the curriculum and I always found that helped me really understand what these equations really do.
Sal, I love you. The origin of this equation has mystified me for years but with a single video you showed it's just a simple and straightforward derivation. I used to just memorize it but now I understand it.
I love you so much i wish the whole world was smart like this community and amazing like these people !
Thanks a lot Mr. Sal❤ You are like one of online tutor in Indonesia but much better and I could acces all your videos freely. I couldn't say a word for how much thankful I feel for finding your channel.
you are seriously my life savor, i count on all your chemistry and math videos to pass my tests :)
The video is great and helpful but my teacher has another formula that also works: (vf )^2=(vi)^2 +2a*(change in displacement) and he said this equation id derived from the equation shown in the video.
Very helpfull. But whats that about a ball a ball in 0:05
In this formula F=(G•(mass of earth)•(mass of object))/(radius of earth)² , if this is ture, then on moon same force will apply as on earth....
Love it, and really was a great explanation.
2400th VIDEO!! congratz!, you are amazing!
you can differentiate and integrate each of these to get from displacement to acceleration
Please make some calculus-based physics!
I hope this has parlayed into gabillions of dollars for you, you deserve it. My Universities owe you a cut. Many blessings to you and yours sir :0) My degree needs to say KU LOL
thank you
If the acceleration wasn't constant but was a=Gm/r². So you would have acceleration as function of distance. How would you tell speed as function of time?
If v=∫adt so speed would be Gm∫(1/r²)dt. Guess you need to tell distance as function of time to be able to integrate that, but how can you do it?
i learnt it as s = ut + 1/2at^2
-.- Indian?
9:07
FOR HARAMBE
i didn't quite understand how he got 9.8m/s because I don't know numbers he used to calculate it.
if you know pls tell me
thx
merci!why y assum a constant acceleration?
Because that's first year physics.
9:00 why didn't you divide delta t by 2 also?
Talking down on basic physics doesn't make you look "smart", if that's what you want.
Smart people respect the basics, because it's the basics that covers the most important stuff.
wait how did he get vf= fi + a * delta time?
If you are driving at a certain velocity, and you wish to change your velocity, you'll notice that you can't instantaneously do this. You must accelerate (for example when you get on the highway) or decelerate (when you have to stop for a red light).
This acceleration (positive if you go faster, negative if you go slower) is given the letter 'a' and it depics the rate of change in velocity in a certain time. The time you take to accelerate from your initial velocity to your final velocity is the change in time between the moment you're driving at your initial speed and the moment you're driving at your final speed and is given the symbol 'delta t'.
So when you accelerate (or decelerate) for a certain duration of time, your initial velocity will change until you reach your final velocity after that duration. And that's where the formula comes in.
Initial Velocity + Acceleration * Duration = Final Velocity (driving at a certain velocity, speeding up or slowing down for a certain duration of time means you'll be driving at a different velocity, formally called the final velocity)
this is the first khan academy video I disliked, just doesn't explain things as well as the other videos unfortunately
true
ANd there is not a physics book around .....
Nice illustration on how we are teaching things pointless stuf because old people are unable to use computers.
yea...
2 professors are jealous.
im butthurt
.
nothing this guy says can keep my attention. maybe I'm just dumb, but its annoying
I thought i was the only one