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Regarding Ludwik's comments:
... . John is
referring to idealizations in which F acts on a particle, or on a rigid
body. Leigh, on the other hand, was bringing a very persuasive
argument for "F being a cause of a" in non-ideal situations. The
center of mass of a real body does not start accelerating at the
same moment at which the force is applied. What do you think
about this argument, John? In the last message Leigh wrote:
<SNIP Leigh's comments>
As much as I think Leigh's point was clear, I don't think he meant to
claim (if I'm incorrect here about Leigh's thinking, I hope he would
correct me) that "The center of mass of a real body does not start
accelerating at the same moment at which the force is applied."