·
Gravity is one of
the four basic forces in the universe.
·
Law of
Gravitation: Two masses exert an
attractive force on each other
·
Force depends on
the mass of the objects and the distance between them. 
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Gravity accelerates all objects at the same rate, regardless
of their mass (heavy things do NOT fall
faster!)
o
Everything on
Earth accelerates at 9.8 m/s2
o
Free fall: when gravity is the only force acting on an object
o
Weight: the gravitational force exerted on an object
§
Weight = mass *
9.8 m/s2
§
Weight and mass
are NOT the same!
§
Weight is a force, mass is the amount of
matter
§
What would your
weight be on other planets?
o
Weightlessness
for astronauts is really free fall!
·
Projectile
motion: anything thrown follows a
curved path
