# lesson 3

Term Definition
What determines gravity? the strength of the force of gravity between two objects depends on two factors: the masses objects and the distance between them
Force push or pull
Gravity attracts all objects toward each other
Law of Universal Gravitation states that every object in the universe attracts every other object
Mass amount of matter in an object
Weight measure of the force of gravity on an object
Force of gravity decreases as the distance increases
What keeps objects in orbit? newton concluded that inertia and gravity combine to keep earth in orbit around the sun and moon in orbit around earth
Inertia the tendency of and object to resist change in motion
more mass = greater inertia
Newton's 1st law of motion says that objects at rest will stay at rest and objects in motion will stay in motion with a constant speed and direction unless acted upon by a force

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