General Definitions

	Cycle - the repetition of movement.
	Period - the time it takes for one complete cycle to occur.
	Acceleration - a change of velocity in an object.
	Frequency - the number of cycles completed per unit time. (Usually in cycles per second (cps) or hertz (Hz))
	Speed - distance travelled per unit time. (e.g. m/sec; miles/hr)
	Instantaneous speed - how fast you are going at a given moment.
	Velocity - speed with direction. (vector)
	Static Friction - friction between two bodies at rest relative to one another. It is what keeps a block of wood from sliding on a table until you raise the edge of the table beyond a certain height.
	Kinetic Friction - friction between sliding surfaces. In a system, the amount of force to overcome static friction is always greater than kinetic friction.
	Gravity - when two bodes exert a pull on each other. The degree of pull a body exerts on another depends upon its mass and the distance between them.
	Cohesion - attraction between similar molecules.
	Adhesion - attraction between different molecules.
	Vectors - quantities (arrows) which show both magnitude and direction.
	Displacements - the distance and direction 'travelled'.
	Inertia - A property of everything that has mass that describes the tendency that bodies have to resist changes in motion.         - If at rest it remains at rest...         - If moving in a certain direction, it will maintain that direction...         - If traveling at a certain velocity; it will remain at that velocity... ...so long as it is left alone. (no other forces applied to it)
	Mass - The quantity that measures how difficult it is to change the state of motion of an object.