 Joe, could we do a question about transforming a physics problem into a math problem? Sure, it's... Do you have one in mind? Physics can go down so many directions and a lot of physics problems are We're working with known equations, models, right? So we sort of have to take into account what is known What we know about a certain situation, right? So, like for example force equals F equals ma, right? So Force is equal to mass times acceleration. One of the most simpler simplest things, right? Newton's second law The second law, right? So that's a formula that we know. Force of an object is equal to mass times It's acceleration. So if you want to find out question would be What's the force of an object? Find force of an object with mass of 15 kilograms Accelerating G at 50 meters per second, right? Then F equals ma would just be all the force of an object is equal to mass times Acceleration and this is going to be What is it 75 and the units? This is mass is going to be the units is kilograms times meters per second That's what we got the killer kilograms Is the mass and meters per second is the meters per second squared is the acceleration and This unit is called Newton's The force of that object is 75 Newton's right? so As for the derivation of this formula Oh my I can't remember the derivation of the formula. I'm pretty sure I've looked at it, but I can't remember it so Here's the problem A ball is shot into the air. This kinematics a ball is shot into the air From the edge of a building 50 feet above the ground Its initial velocity is 20 feet per second The equation is oh when they give you the equations the easiest stuff and the question asks how long until the ball hits the ground Let's do this Physics question when you're given the equation Should be the easiest physics questions that you ever do So here's here's the formula that they've given you the equation is this And that's going to be distance. I believe right so the distance D is a D D is equal to negative 16 T squared plus 20 T plus 50 is a D It's initial velocity is 20 feet per second So something's wrong. We need that So ball is shot into the air from the edge of the building 50 feet above the ground. So here's a building Into the air. I'm assuming it's being shot like this I pulled the ground to velocity of 20 feet per second 20 feet per second The equation is that and the equation asks how long until the ball hits the ground To answer the question you simply need to solve the quadratic equation But how do we actually drive the formula from the word problem in the first the formula from the word problem is Driven like the quadratic formula this thing that you're talking about. This is the quadratic formula of the simplest The basic quadratic formula of this from mathematics, right? Now these quadratic formulas The that model projectiles a lot of it occurs through observation Right, so what they do if you've ever sat in a lab In a physics lab what they'll do is they'll Do projectiles and they have some kind of sometimes flash Some kind of light system that flashes and in the background they'll have some kind of sheet with where it Embeds the projectile, right? So once you do that then what you can do if you model this stuff You can throw this on a cartesian coordinate system, right? Let's assume you say, oh, okay. You don't want to to make this simple. I'm going to put my x and y axes here Right, so I'm going to make the peak of the thing my Origin for the cartesian coordinate system and then you can take points from here x and y Take points from here x and y x and y, you know x and y and Do some algebra to come up with equations for these functions, right? Because from the motion you would say, oh, this is obviously parabola, right? If this is a parabola then General formula for a parabola is a x minus p squared plus q. That's the vertex form of parabola And if the origin is zero zero So bad Also, hi. Sorry. Hi. Hi judah. How are you doing then p and q would be zero So f of x would equal a x right a x squared And then what you can do you have to calculate your a value Well, if you want to calculate your a value all you got to do is take one of these points plug them in Get your a value and then your function for this thing would be oops Whatever the a value is the number x so you get that back and that's your formula and all that jazz right A lot of it is through modeling a lot of it is through modeling And there are some that are derived, right 100 percent from other Formulas that we have that we bring in together and say oh, this is this is this is this is this is this is Here's a new formula Here's a new formula Gang do not forget. What is this called? This is called projectiles, right first time chat Smuggy nine. I think we don't need formula for such questions um formulas come in handy and These formulas if they give them to you in the question and physics Really easiest questions you can do Easiest questions you do And gang do not forget do not forget. Thank you. Other god free a song free a song free a song Julian songs is a publisher and journalist that has been crucified for trying to bring transparency and accountability of capitalist power to humanity For more information see wikileaks.org defend dot wikileaks.org or our Julian songs on wikileaks playlist on