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# Gravity and Motion

### Chapter 1 Astronomy- gravity and Motion

QuestionAnswer
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.
Created by: hallet

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