| A | B |
|---|
| Newton's First Law | every body continues in its state 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 on it |
| Newton's Second Law | the acceleration produced by a net force on a body is directly proportional to the magnitude of the net force, is in the same direction as the net force and is inversely proportional to the mass of the body |
| Newton's third law | whenever one body exerts a force on a second body the second body exerts an equal and opposite force on the first |
| normal force | for an object resting on a horizontal surface the upward force that balances the weight of the object ; also SUPPORT FORCE |
| opaque | term applied to a material that absorbs light without remission and does not allow light thru them |
| Pascal's principle | changes in pressure at any point in an enclosed fluid at rest are transmitted to all points in the fluid and acts in all directions |
| projectile | any object that moves through the air or through space acted on only by gravity |
| power | rate at which work is done or energy is transformed |
| rarefaction | a disturbance in air (or matter) in which the pressure is lowered |
| Second Law of Thermodynamics | heat will never of itself flow from one object to another of higher temperature |
| specific heat capacity | the quantity of heat required to raise the temperature of a unit mass of a substance by one degree Celcius |
| terminal velocity | the terminal speed together with the direction of motion |
| greenhouse effect | when short wavelength energy from the sun can enter the atmosphere and be absorbed by the earth more easily than longwave energy can leave the earth |
| thermal equilibrium | the state of two or more objects or substances in thermal contact when they have reached a common temperature |
| transparent | term applied to materials that allow light to pass through them in a straight line |
| boiling | the change of phase from liquid to gas that occurs beneathe the surface in the liquid |
| evaporating | the change of phase from liquid to gas that takes place at the surface of a liquid |
| compound | a chemical substance made of atoms of two or more different elements combined in a fixed proportion |
| mixture | combining two or more substances where a chemical reaction does not take place |
| conduction | in heat energy transfer from particle to particle with certain materials or from one material to another when the two are in direct contact |
