Name: 1.靜電學 (1. Electrostatics)
Uploaded: 2021-01-14T05:24:43.000Z
Duration: 1 h 6 min 2 s
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you the syllabus for this term--not the detailed one,

程度副詞

The game plan is: we will do electromagnetic

Electromagnetism is a new force that I will introduce to you and

And I will do optics, and optics is part of

And then near the end we will do quantum mechanics.

Now, quantum mechanics is not like a new force.

It's not about what forces are acting on this or that object

The question there is: should we be even thinking

Should we be even thinking about particles going on any

Forget about what the right trajectory is.

And you will find out that most of the cherished ideas get

But the good news is that you need quantum mechanics only to

study very tiny things like atoms or molecules.

Of course the big question is, you know, where do you draw the

Some people even ask me, "Do you need quantum

So, I've gone to parties where after a few minutes of talking

to a person I'm thinking, "Okay, this person's brain

needs a fully quantum mechanical treatment."

But most of the time everything macroscopic you can describe the

way you do with Newtonian mechanics, electrodynamics.

All right, so now we'll start with the brand new force of

But before doing the force, I've got to remind you people

of certain things I expect you all to understand about the

dynamics between force, and mass, and acceleration that

I'm going to start by reminding you how we use this famous

in high school, but it's a lot more subtle than

So I will tell you what I figured out over these years on

In other words, if you have the equation what's

The only thing anybody knows right away is a stands

for acceleration, and we all know how to measure

By the way, anytime I write any symbol on the board you should

otherwise you don't know what you're talking about as a

Acceleration, I think I won't spend too much

You should know what instruments you will need.

So I will remind you that if you have a meter stick,

or many meter sticks and clocks you can follow the body as it

You can find its position now, its position later,

Then find the velocity now, find the velocity later,

So acceleration really requires three measurements,

two for each velocity, but we talk of acceleration

right now because you can make those three measurements

arbitrarily near each other, and in the limit in which the

time difference between them goes to zero you can talk about

the velocity right now and acceleration right now.

But in your car, the needle points at 60 that's

And if you step on the gas you feel this push.

So we know acceleration, but the question is can I use

the equation to find the mass of anything.

Now, very often when I pose the question the answer given is,

you know, go to a scale, a weighing machine,

And as you know, that's not the correct answer

because the weight of an object is related to being near the

earth due to gravity, but the mass of an object is

Now you might say, "Well, take a known force and find the

acceleration it produces," but we haven't talked about how

The correct thing to do is to buy yourself a spring and go to

the Bureau of Standards and tell them to loan you a block of some

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1.靜電學 (1. Electrostatics)

matter

force

measure

find