Re: A Hitchiker's Guide to FORCE.



On Jan 8, 11:58 am, moschops <mosc...@xxxxxxxxxxxxxx> wrote:
PD wrote:

On Jan 6, 11:21 pm, HW@....(Henri Wilson) wrote:
On Sat, 06 Jan 2007 13:44:14 +0000, moschops <mosc...@xxxxxxxxxxxxxx> wrote:
Henri Wilson wrote:
On Fri, 05 Jan 2007 15:53:41 +0000, moschops <mosc...@xxxxxxxxxxxxxx> wrote:
Hiya chaps.
Any chance of a recasting of the question in a simpler form? Is this
question 'what is inertia' or is it 'what's friction all about'?
It is about inertial force. How and where does it originate?
This is the basic experiment:
1. Stretch a light spring over a long rod.
2. Connect large masses to the two ends of the spring.
3. Remove the rod.
The question is, what is the origin of the outwards forces that are necessarily
being exerted on the ends of the spring to maintain its extension (at least for
a considerable period)
Moschops
The spring exerts a force on each mass, pulling them inwards at a rate
in accordance with Newton's second law.That is correct....although we asume the movement is small enough to be
ignored.

Newton's third law indicates that the masses exert an equal and opposite force on the ends of the
spring - to specify, are these two forces of which you speak?Yes... but Newton's 3rd law is just an observation of reality. It doesn't
explain the NATURE and ORIGIN of those 'inertial reactions'.

I suppose the direct question is simply, "why do reactionary forces exist at
all?"

Because a force -- any force -- is best understood as the symmetric
interaction between two objects, NOT the asymmetric action of one
object on another.

PD
You could have said that bloody ages ago, you know!

:>)
Sometimes it takes a while to drill down to the exact point of
confusion, which in Henri's case is broad and pervasive.
He first asked what keeps the spring extended, and several people said,
"Nothing. The spring doesn't stay extended," which is the correct
answer to that question.
He then asked why forces keep the spring extended longer than the fast
snap-back the spring would do on its own, and several people said, "The
forces of attachment between the spring and the massive blocks," which
is the correct answer to that question.
He then asked (along with you and Greg) about what causes the force due
to inertia, and several people said, "There is no such thing a force
due to inertia," which again is the correct answer to that question.

Now, I predict that Henri will announce that none of us know what we
are talking about and that only someone born with a scientific mind
(himself) can ferret out the truth.

PD

.

Relevant Pages

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