How Earth revolves around the sun
in a nearly circular orbit
How the moon orbits the Earth
in a nearly circular orbit
force
a push or a pull
gravity
attracts all object toward each other
law of universal gravitation
every object in the universe attracts every other object
the unit used for gravity
newtons
the strength of the force of gravity depends on 2 factors
the matter of the object and the distance between the objects
Sir Isaac Newton
first scientist to realize that gravity occurs everywhere
Why dont Earth and the moon just fly off into space?
Because there is a force between the two that makes them stay together.
mass
amount of matter in an object
weight
the force of gravity on an object
the weight of an object
can change depending on its location
As the distance between two objects increases
the force of gravity decreases
Newton's first law of motion
an object at rest will stay at rest, and an object in motion will remail in motion until an outside force stops it
inertia
the tendency of an object to resist change in motion
more mass =
more inertia
inertia and gravity combined keep the planets in
orbit around the sun and the moon in orbit around the Earth
the force of gravity depends on
mass and distance