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# Phys ch 1,2,4

### Physics key terms chapters 1, 2 & 4

Fact A true statement; A close agreement by competent observers of a series of observations of the same phenomena
hypothesis An educated guess
law Hypothesis that is tested over & over again and has not been contradicted; also known as a principle
principle A general hypothesis or statement about a relationship of natural quantities that has been tested over and over again and has not been contracicted; also known as a law
scientific method An orderly method for gaining,organizing, and applying new knowledge
theory A synthesis of a large body of information that encompasses well-tested and verified hypotheses about aspects of the natural world
acceleration The rate at which velocity is changing. The change may be magnitude, direction or both.
average speed Path distance divided by time interval
elapsed time the time that has passed since the beginning of an event
free fall Motion under the influence of the gravitational force only
instantaneous speed Speed at any instant of time
rate how fast something happens or how much something changes per unit of time; a change in a quantity divided by the time it takes for the change to occur
relative regarded in relation to something else. Depends on point of view or frame of reference. Sometimes referred to as "with respect to"
speed How fast somtheing is moving; the path distance moved per time. The magnitude of the velocity vector
velocity Speed together with the direction of motion.
equilibrium A state of balance; The state of a body on which no net force acts.
force Any influence that tends to accelerate an object; a push or pull; measured in newtons. A vector quantity.
friction the force that acts to resist the relative motion (or attempted motion) of objects or materials that are in contact.
inertia the reluctance of any body to change its stae of motion. Mass is the measure of inertia.
kilogram The fundamental (base) SI unit of mass. 1 kg is the amount of mass in one liter of water at 4 degrees Celcius
law of interia Every body continues in its stae of rest, or of motion in a straight line at constant speed, unless it is compelled to change that state by a net force exerted upon it. Also know as Newton's First Law
mass A measure of an object's inertia; also a measure of the amount of matter in an object. Depends only on the amount of and kind of particles that compose an object-not on its location
net force The combination of all the forces that act on an object
newton SI unit of force. One Newton is the force applied to a one-kilogram mass that will produce an acceleration of one meter per second per second
Heliocentric solar system sun centered solar system
Geocentric solar system earth centered solar system
Created by: jdkelley11