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