Sci. 1-4

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Sci. 1-4 Gravity A force of Attraction Pages
21-25
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A. Gravity- the force of attraction between
objects due to their masses.
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B. The gravitational force pulls objects toward
each other.
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C. The reason that objects arent moving toward
each other all the time is because the mass of
the objects are too small to cause an attraction
large enough to move the objects toward each
other.
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D. Earths gravity is very large so you must
apply force to overcome Earths gravitational
force anytime that you lift objects.
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E. The Law of Universal Gravitation- (Sir Isaac
Newton)- All objects in the universe attract each
other through gravitational force.
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1) Gravitational force is small between objects
with small masses 2) Gravitational force is
larger between objects with larger masses 3) If
the distance between two objects is increased,
the gravitational force is reduced.
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• Weight is a measure of the gravitational force
  exerted on an object. Weight changes as gravity
  changes.

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G. Mass- the amount of matter in an object. Mass
does not change. Weight on the moon is 1/6 of
Earths. The mass is the same.