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Re: [Phys-L] inertia ... or not


On 2012, May 31, , at 16:04, Kirk Bailey wrote:

Hi John,

I agree that mass and linear inertia are synonyms, but mass and rotational
inertia are definitely not synonyms. In my mind, when introducing inertia,
one must mention that inertia is the resistance to a change in the state of
motion, not resistance to acceleration (because rotating objects are always
accelerating). What am I missing?
On Thu, May 31, 2012 at 4:58 PM, John Denker <jsd@av8n.com> wrote:


My thought inertia "was" used to separate the two manifestations of mass, i.e. gravity and ..... inertia.

Incidentally, should we not call rotating mass, moment of mass not inertia?

bc waiting for JD's riposte.