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Astronomy Book Vocabulary
Chapter 1/Section 2
7
Astronomy
8th Grade
09/01/2008
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Term
force
 Definition
a push or a pull exerted on an object
Term
gravity
 Definition

the attractive force between objects;

its strength depends on their masses

and the distance between them
Term
law of universal gravitation
 Definition

the scientific law that states that every object

in the universe attracts every other object
Term
mass
 Definition
the amount of matter in an object
Term
weight
 Definition
the force of gravity on an object
Term
inertia
 Definition

the tendency of an object to

resist a change in motion
Term
Newton's first law of motion
 Definition

the scientific law that states that an object

at rest will stay at rest and an object in

motion will stay in motion with a constant

speed and direction unless acted on by a force
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