In Aristotelian physics, the motin of objects toward their natural places- fire and air upward and earth and water downward.
In Aristotelian physics, motion other than natural motion.
acceleration of gravity
A measure of the strength of gravity at a planet's surface.
The tendency of a moving object to continue moving; mathematically, the product of mass and velocity.
A measure of the amount of matter making up an object.
A change in a velocity; a change in either speed or direction.
A rate of travel that specifies both speed and direction.
A conjecture, subject to further tests, that accounts for a set of facts.
A system of assumptions and principles applicable to a wide range of phenomena that have ben repeatedly verified.
A conjecture about how nature works in which scientists have overwhelming confidence.
inverse square law
A rule that the strength of an effect (such as gravity) decreases in proportion as the distance squared increases.
A way of explaining action at a distance; a particle produces a field of influence (gravitational, electric, or magnetic) to which another particle in the field responds.