In article , tadchem
writes:

"AngleWyrm" wrote in message
news:TP3Ob.83590$xy6.143355@attbi_s02...

snip

Yea, Newton; the Moon is travelling just fast enough to fall around the
Earth. Nice. Problem with his idea was when he said (in part) that gravity
is proportional to the mass of the objects...Looked good on paper until
Galileo dropped a cannon ball and a bullet from the Leaning Tower of Pisa.
"Hey guys: They hit the ground at the same time!" So much for gravity
being
proportional to the mass of the objects.

Galileo did his experments _before_ Newton was even born: The moon's speed
could be considerably faster or slower than it is, and it would still fall
around the Earth: In fact it is alternately slowing down and speeding up all
the time.

Proportional does not mean that gravity varies with mass either: It varies
with the weight of the mass: Heavy bodies like cannon balls have more weight,
and therefore more inertia, and are harder to accelerate: Its a case of
reciprocity? The cannon ball has more weight-force pushing it down, but its
greater inertia makes it harder to accelerate: The bullet is lighter but
accelerates easier: So they both fall at about the same speed: Sumpin like
that anyways(:-)

Cut

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