Drag, velocity squared, and air resistance

35:36they care about here is drag. And that's the thing that, you know, most anyone cares about when it comes to aerodynamics. So, drag is, you know, the resistance of the air to your motion. Okay? And it's always proportional to the velocity squared. That kind of makes sense because the faster you go, the harder you're hitting the particles and the more particles you're hitting. So, there's a double factor of the velocity, right? There's like you're moving through this, so you're hitting the air molecules at a faster speed, so you're transferring momentum faster. And also, there's more stuff that you're hitting the faster you go. So, that's why you get a a V squared. It's also proportional to the area because the larger the cross-sectional area, the the

36:17more air particles you're going to be hitting. It's proportional to the density of the air, obviously, because like you know, the denser the air, the more of drag is going to be. The >> the the denser the fluid, right? And then there's um something called the drag coefficient, which in this case is the CD. That's the coefficient of drag. And that's like the number that gives you the drag force. Okay, there's like all of those factors plus something having to do with the surface of the ball and the shape. The surface of the object and the shape, I should say. Okay?