|The friction between two objects that keeps them from sliding across each other
|A force that attracts everything toward the center of the earth
|The sticking together of two different materials.
|When a material can stick to itself
|A substance that reduces friction
|A force that holds back the movement of an object
|The friction that slows an object as it moves through air or water
|A shape that allows an object to move through fluids and air without as much drag
|The maximum speed an object can fall; the speed limit for falling objects
|A force that acts on a body moving in a circular path and is directed toward the center around which the body is moving
|law of universal gravitation
|The law that says the closer things are to one another, the more powerful the attraction.