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# Common sensible definitions & equations

## Common sensible definitions & equations - Physics Forum

### Common sensible definitions & equations - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.

#11
09-09-2005, 01:34 PM
 Don1 Guest Posts: n/a
Common sensible definitions & equations

odin wrote:
What I've _got_ at is that f=(f/a)a; not f=ma: m=w/g= f/a you dope; so
m is not an independent variable and cannot be transposed as if it
were.

If a slope has an unchanging direction it's a straight line; regardless
of its tangent point of intercept.

Don

#12
09-09-2005, 01:39 PM
 Don1 Guest Posts: n/a
Common sensible definitions & equations

There you go, whistling in the dark again.

Don

#13
09-09-2005, 03:03 PM
 odin Guest Posts: n/a
Common sensible definitions & equations

>> Only fools would bother to make the obvious point that w=(w/g)g and

Hmmm. You are coreect... Now and then, I feel sorry for him. At other times,
he pisses me off. I cannot seem to get a good fix on how I should feel
towards him...

#14
09-09-2005, 03:11 PM
 odin Guest Posts: n/a
Common sensible definitions & equations

> What I've _got_ at is that f=(f/a)a; not f=ma: m=w/g= f/a you dope; so

What does it mean when you say "m is not an independent variable"? What does
"transposed " mean here? Once you define those terms, please explain how
this variable independence and this lack of variable transpositibility are
related.

#15
09-09-2005, 03:12 PM
 Randy Poe Guest Posts: n/a
Common sensible definitions & equations

Don1 wrote:

Don:

According to you, one or more of these is wrong, is invalid
in your view of algebra. Which one and why?

Q1. A car travels 40 miles in two hours at a constant speed.
What was the speed?
A1. v = d/t = 40/2 = 20 mph.

Q2. A car travels 40 miles at 20 mph. How long did it take
to arrive at its destination?
A2. t = d/v = 40/20 = 2 hours.

Q3. A car travels for 2 hours at 20 mph. How far does it go?
A3. d = vt = 20*2 = 40 miles.

Now you say that v = d/t, t = d/v and d = vt can't all be
true, right? Which ones are wrong?

- Randy

#16
09-09-2005, 04:31 PM
 ghytrfvbnmju7654@mail.com Guest Posts: n/a
Common sensible definitions & equations

Don1 wrote:

Don's postulates are getting stranger. What would Don say about the
following logic?

m=w/g= f/a
m=w/g and w/g= f/a
m= f/a
f/a =m
(f/a) =m
f=(f/a)a
f=ma

What postulate have I used that does not exist in Don's logic?

#17
09-09-2005, 04:50 PM
 Don1 Guest Posts: n/a
Common sensible definitions & equations

[Only registered users see links. ] wrote:

Always with the trick questions. Don't keep us in suspense, tell us.

Don

#18
09-09-2005, 05:38 PM
 Clemens W Guest Posts: n/a
Common sensible definitions & equations

Don, with his special sense of math, wrote:

That's no trick question, Don. We really don't know. Because, using
normal math, the above equations are all correct.

However, you are claiming this is wrong. Your special weirdo math says
that 1/(x/y) is not the same as y/x.

Now, the onliest thing that's still missing is ANY proof of your bogus
math.

A. Friend

#19
09-09-2005, 06:01 PM
 Don1 Guest Posts: n/a
Common sensible definitions & equations

odin wrote:

If you don't already know that only a term is algebraically
transposible, then far be it from me to explain it to you. I never
_took_ algebra but sat through many a class of it taught by "Windy
Bill", in high school.

Any fool knows that a term consists of one or more independent
variables. When within parentheses, two or more variables must be kept,
and manipulated together.

Don

#20
09-09-2005, 06:45 PM
 PD Guest Posts: n/a
Common sensible definitions & equations

Don1 wrote:

I can think of several possibilities here.
1. It's been too long since you listened to Windy Bill to remember
clearly.
2. Windy Bill told you things that were wrong.
3. Windy Bill told you things that were right, but you misunderstood
them immediately, which you wouldn't have ever realized because you
didn't take a test to assess your understanding.
4. You didn't sit in *enough* of Windy Bill's classes to catch any more
than a few things.

In any case, I can assure you, Don, that your understanding of algebra
and the rules of algebra is not only rusty and dull, but you're holding
the wrong end of the knife. What you think "any fool" knows is
precisely that: what a fool would think.

So before you confidently use a tool (algebra), you'd better check that
you have solid grounds for your confidence. Buy a book. Work the
problems.

PD

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