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Re: Inertia



III
Inertial Force
A body only exerts this force when another force
impressed on it attempts to change its condition.
this looks reasonably like reaction force.

IV
An impressed force is an action exerted upon a body,
in order to change its state, either of rest, or of
uniform motion in a right line.
this looks reasonably like external force.

We do not today distinguish between these forces. As
an example of why this is so, consider the interaction
between a baseball and a bat. Each exerts a force on
the other. Which is the impressed force and which is
the reaction force? Your answer will depend entirely
upon a subjective judgment and whether the event was
a bunt or a home run.

Leigh