Name: 2.3 摩擦力-コードの性質 (2.3 Friction Force - The Nature of Code)
Uploaded: 2021-01-14T10:50:24.000Z
Duration: 14 min 45 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

What I have done so far, using the classical laws of motion,

classical mechanics, force equals mass times acceleration,

I have implemented a system where mover objects can

receive forces as vectors and have those forces control how

But the way that I have created these force vectors

Now, there are many different kinds of friction and examples

is friction that holds something in place

and not moving versus kinetic friction, which

is the friction that occurs when two surfaces are in moving

Here's the diagram that I have to describe the friction

I'm going to take a minute to rewrite that formula over here.

The approach I like to take when finding a formula like this

and then trying to figure out how to apply it in code

is to unpack each of the elements of the formula one

at a time and figure out whether it actually applies or is,

to simplify in the case of our sort of 2D p5 canvas.

So one, let's-- I'm going to go in sort of in arbitrary order

here, but something really to note here is, what is this?

It's moving in this direction, that's its current velocity,

and I want to describe what is the direction of friction.

Circling back for a second, what am I doing again?

and I need to figure out two things, direction

The direction here is expressed as the unit vector pointing

in the velocity's direction times negative 1.

So I know that the friction points in this direction.

Well, I have two other variables in this formula.

And all these, by the way, are scalars, scalar, scalar,

This is known as mu or the coefficient of friction.

Let's play a little knock-knock joke together.

The interrupting coefficient of friction.

that describes the strength of the friction force based

and there's a much greater amount of friction.

So the coefficient of friction is tied specifically

to the material itself and what its behavior as it

This diagram has a sled in contact with a hill,

The force of gravity is a force pointing directly down

towards the center of the Earth and causing the sled

to kind of rub in with the hill as it moves

The normal force is the force perpendicular

the component that is perpendicular to the hill.

I mean, all this is like super important in real world

physics, but let me remind you what we're doing here.

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2.3 摩擦力-コードの性質 (2.3 Friction Force - The Nature of Code)

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