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Sec. 2 Gravity &
Motion
force•a push or a pull
gravity
• force that attracts all objects toward each other
• measured in newtons
1.mass of objects–distance between
objects (force as distance )
strength of gravity depends on 2 factors
Newton’s law of universal gravitation
• every object in universe attracts every other object
Amount of matter in an object
Force of gravity on an object
mass
weight
inertia
• tendency of an object to resist a change in motion
• ex: egg in glass trick
Isaac Newton
2 factors that keepEarth in orbit
moves Earth in straight line
inertia gravity
pulls
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