CH12 Gravitation
Newton¡¯s Law of Gravitation
G
is first determined by Cavendish torsion balance.
Shell theorem
A uniform spherical shell of matter attracts a particle that is outside the shell as if all the shell¡¯s mass were concentrated at its center.
Weight
If
r<R
, then
Weight:
the total gravitational forces exerted on a body by all other bodies in the universe.
Gravitational potential energy
Gravitational force is conservative, so we can define a potential energy
If close to the Earth¡¯s surface,
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