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If you're seeing this message, it means we're having trouble loading external resources on force videos de youtube website. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. Main content. Science Physics Centripetal force and gravitation Newton's law of gravitation. Introduction to gravity. Mass and weight clarification. Gravity for astronauts in orbit.

Would a brick or feather fall faster? Acceleration due to gravity at the space station. Space station speed in orbit. Introduction to Force videos de youtube law of gravitation. Gravitation part 2. Current time: Video transcript We're now going to learn a little bit about gravity.

And just so you know, gravity is something that, especially in introductory physics or even reasonably advanced physics, we can learn how to calculate it, we can learn how to realize what are the important variables in it, but it's something that's really not well understood. Even once you learn general relativity, if you do get there, I have to say, you can kind of say, oh, well, it's the warping of space time and all of this, but it's hard to get an intuition of why two objects, just because they have this thing called mass, they are attracted to each other.

It's really, at least to me, a little bit mystical. But with that said, let's learn to deal with gravity. And we'll do that learning Newton's Law of Gravity, and this works for most purposes.

So Newton's Law of Gravity says that the force between two masses, and that's the gravitational force, is equal to the gravitational constant G times the mass of the first object times the mass of the second object divided by the distance between the two objects squared.

So that's simple enough. So let's play around with this, and see if we can get some results that look reasonably familiar to us. So let's use this formula to figure out what the acceleration, the gravitational acceleration, is at the surface of the Earth. So let's draw the Earth, just so we know what we're talking about. So that's my Earth. And let's say we want to figure out the gravitational acceleration on Sal.

That's me. And so how do we apply this equation to figure out how much I'm accelerating down towards the center of Earth or the Earth's center of mass? The force is equal to-- so what's this big G thing?

The G is the universal gravitational constant. Although, as far as I know, and Force videos de youtube not an expert on this, I actually think its measurement can change.

It's not truly, truly a constant, or I guess when force videos de youtube different scales, it can be a little bit different. But for our purposes, it is a constant, and the constant in most physics classes, is this: I know these units are crazy, but all you have to realize is these are just the units needed, that when you multiply it times a mass and a mass divided by a distance squared, you get Newtons, or kilogram meters per second squared.

So we won't worry so much about the units right now. Just realize that you're going to have to work with meters in kilograms seconds. So let's just write kurzgeschichte wettbewerb number down.

I'll change colors to keep it interesting. And I don't feel like revealing my mass in this video, so I'll just leave it as a variable. And then what's the mass 2? It's the mass of Earth. And I wrote that here. I looked it up on Wikipedia.

This is the mass of Earth. So I multiply it times the mass of Earth, times 5. Now, you might say, well, what's the distance between someone standing on the Earth and the Earth?

Well, it's zero because they're touching the Earth. But it's important to realize that the distance between the two objects, especially when we're talking about the universal law of gravitation, is the distance between their center of masses.

For all general purposes, my center of mass, maybe it's like three feet above the ground, because I'm not that tall. It's probably a little bit lower than that, actually. Anyway, my center of mass might be three feet above the ground, and where's Earth's center force videos de youtube mass?

Well, it's at capture id mac center of Earth, so we have to know the radius of Earth, right? So the radius of Earth is-- I also looked it up on Wikipedia-- 6, kilometers. How many meters is that? It's 6 million meters, right? And then, you know, the extra meter to get to my center of mass, we can ignore for now, because it would be. So it's and soon. I'll write it in scientific notation since everything force videos de youtube is in scientific notation-- 6.

So let's write that down. So the distance is going to be 6. We have to square that. Remember, it's distance squared. So let's see if we can simplify this a little bit. Let's just multiply those top numbers first.

Force is equal to-- let's bring the variable out. Mass of Sal times-- let's do this top part. So we have 6. And I just multiplied this times this, so now I have to multiply the 10's. So 10 to the negative 11th times 10 to the negative 24th.

We can just add force videos de youtube exponents. They have the same base. So what's 24 minus 11? It's 10 to the 13th, right? And then what does the denominator look like? It's going to be the 6. So it's going to be-- whatever this is is going to be like 37 or something-- times-- what's 10 to the sixth squared?

It's 10 to the 12th, right? So let's figure out what 6. This little calculator I have doesn't have squared, so I have to-- so it's And so simplifying it, the force is equal to the mass of Sal times-- let's divide, That's just force videos de youtube divided by this. And then 10 to the 13th divided by 10 to the 12th.

Actually no, this isn't 9. Sorry, it's 0. Well, the force is equal to 9. And where does this get us? How can we figure out the acceleration right now? Well, force is just mass times acceleration, right? So that's also going to just be equal to the acceleration of gravity-- that's supposed to be a small g there-- times the mass of Sal, right? So we know the gravitational force is 9. We can divide both sides by the mass of Sal, and we have the acceleration of gravity.

And if we had used the units the whole way, you would have seen that it is kilograms meters force videos de youtube second squared. And we have just shown that, at least based on the numbers that they've given in Wikipedia, the acceleration of gravity on the surface of the Earth is almost exactly what we've been using in all the projectile motion problems. It's 9. That's exciting.

So let's do force videos de youtube quick problem with gravity, because I've got two minutes. Let's say there's another planet called the planet Small Earth. So what's the pull of gravity on any object, say same object, on this? How much smaller would it be on this planet?

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Ich tue Abbitte, dass sich eingemischt hat... Ich finde mich dieser Frage zurecht. Geben Sie wir werden besprechen.