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Gravity and Motion
Chapter 1 Astronomy- gravity and Motion
Question | Answer |
---|---|
force | A push or pull exerted on an object |
gravity | The attractive force between objects; its strength depends on their masses and the distance between them |
Laws of universal gravitation | The scientific law that states that every object in the universe attracts every other object |
mass | The amount of matter in an object |
weight | The force of gravity on an object |
inertia | The tendency of an object to resist a change in motion |
Newton's first law of motion | The scientific law that states an object at rest will stay at rest, an object in motion will stay in motion, in a straight line, unless acted upon by an outside force. |
orbital motion | Newton concluded that both gravity and inertia combine to keep the Earth in orbit around the sun, and the moon in orbit around the Earth. |