Re: Recantation on inettia

From: Donald G. Shead (dcshead_at_charter.net)
Date: 07/23/04 

Date: 22 Jul 2004 17:51:37 -0700

briggs@encompasserve.org wrote in message news:<3Qzx6tkQ6ZDH@eisner.encompasserve.org>...
> In article <48402bae.0407220554.55a66e02@posting.google.com>, dcshead@charter.net (Donald G. Shead) writes:
> > A body's inertia is what opposes any force with an equal and opposite
> > force,
>
> Confusing Newton's second law with Newton's third law. Par for the course.
>
> Newton's third law is not about inertia resisting an impressed force.
> It is the simple observation that when you push on a wall, the
> wall pushes back on you.

Nah! Walls don't push back. They just resist until the impressed force
exceeds their design strength.

  When you push your hands together, the
> force of your right hand on your left matches the force of the
> left hand on the right. Newton's third law applies no matter whether
> the wall is made of balsa or of lead. It applies no matter whether
> you are wearing a steel gauntlet on your right hand or your left.
>
> Newton's second law is the one that gives a quantitative relationship
> between force, inertia and motion.
>
Make that the quantitative relationship between Displacement [distance
displaced]; Force [and weight], and Time [periods during which force
endures and displacement continues]; so that the ratio of impressed
force [f], divided by the rate of displacement per second [s/t^2] is
the measure of the material matter which the force is acting and/or
acted upon:

Like the inertia of one unit of matter [mass] is the result of one
pound of force acting for one second; causing one foot of displacement
per each sucessive second that it is maintained; which is equal to
thirty-two pounds of force acting for one second; causing thirty-two
feet of displacement for each successive second that it is
maintained...

> John Briggs

Relevant Pages

  • Re: Recantation on inettia
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  • Re: Recantation on inettia
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  • Re: Recantation on inettia
    ... Confusing Newton's second law with Newton's third law. ... Newton's third law is not about inertia resisting an impressed force. ... It is the simple observation that when you push on a wall, ...
    (sci.math)