Chapter 12: Gravitation
12.1 Newton's Law of Gravitation
Weight
– the force that attracts you toward the earth
Newton’s Law of Gravitation
: Every particle or matter in the universe attracts every other
particle with a force that is directly proportional to the product or the masses or the particles and
inversely proportional to the square or the distance between them.
=
Fg
Gm1m2r2
Fg
magnitude of the gravitational
force
m1
and
m2
masses of 2 particles
r
distance between particles
G
gravitational constant
•
Gravitational forces always act along the line joining the two particles; even when
the masses of the particles are different, the two interaction forces have equal
magnitude
Gravitation and Spherically Symmetric Bodies
The gravitational interaction of any two bodies having spherically symmetric
mass
distributions (such as solid spheres or spherical Shells) is the same as though we
concentrated all the mass of each at its center.
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 Spring '11
 McDemus
 Physics, Force, Mass, General Relativity, Gravitational Force, Gravitational forces

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