The force that pulls an apple to the ground, pulls the moon toward Earth, keeps the planets in orbit and attract objects towards each other.
law of universal gravitation
States that every object in the universe attracts every other object.
The amount of matter in an object.
The measure of the force of gravity on an object.
The tendency of an object to resist a change in motion.
Newton's first law of motion
Says that an object at rest will stay at rest and an object in motion will stay in motion with a constant speed and direction unless acted on by a force.