This, so this point at the top here imagine the little Is moving with some speed, so what I mean by that is Still just the same old regular kinetic energy for Is that this rotational kinetic energy isn't really a new kind of kinetic energy, it's This is the rotational kinetic energy of an We didn't really prove this, we just showed To ride this cause that is not really a derivation, If I replace speed with rotational speed, I get the angular speed and So if I replaced mass with rotational mass, I get Substituting the rotational analog for each of the variables, Rotational analog of some linear formula by just Not really a derivation, you're just kind of guessingĮducatedly but you could often get a formula for the Squared, maybe since I have something rotating I'd Instead of mass there's moment of inertia so maybe I replace that.
So I might guess alright instead of mass, I'd have moment of inertiaĬause in Newton's second law for rotation I know that Let me just call that k rotational and what is that gonna be? Well I know for objects that are rotating, the rotational equivalent of The formula for regular kinetic energy is just one half m v squared.
This for the first time, my first guest I'd say okay, I'd say I know what regular How do we determine what the rotational kinetic energy is of an object? Well if I was coming at Mean that that ball has extra kinetic energy? Well it does, and howĭo we figure that out, that's the goal for this video. Pitches head toward home plate with the baseball spinning The fact that most pitches, unless you're throwing a knuckle ball, does the fact that most We know that cause if you get in the way, it could do work on League baseball player throws a fast ball, that ball'sĭefinitely got kinetic energy.