00:01
Okay, let's talk about a concept called buoyancy.
00:04
Buoyancy is a force.
00:06
We know forces are things that push and pull on objects.
00:10
And buoyancy has to do with liquid.
00:12
So let's say we're in some water here.
00:14
Let's say this is water.
00:16
It can be any liquid, but let's say water.
00:18
And let's say we have a box that's floating in the water.
00:22
So any box, or like any object, always has the force of gravity acting down on it, right? this keeps us on the planet.
00:30
This is how things don't fall into space.
00:33
So the only way that this thing can float and not fall down is if there's another force counteracting it, acting in the same direction.
00:43
This is called buoyancy force, fb.
00:47
And the equation for buoyancy force is the density of the liquid times gravity times the volume.
00:56
But the important thing here is that both rho and v, these have to do with the liquid, not with the object in the liquid, right? so rho is the density of this liquid, and v is the volume of the water displaced...