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Phys ch 1,2,4
Physics key terms chapters 1, 2 & 4
| Question | Answer |
|---|---|
| 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
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