| A | B |
|---|
| mass | the amount of matter in an object |
| volume | the amount of space something takes up |
| chemical properties | The ability of a substance to change into a new substance with different properties by combining with other substances |
| physical properties | Property of matter that can be observed without changing the composition or identity of the matter (color, shape, luster) |
| chemical change | occurs when one or more substances are changed into new substances with different properties and cannot be undone by physical means |
| physical change | occurs when one or more physical properties of a substance are changed: many of these can be undone by physical means |
| Law of Conservation of Matter | states that matter can not be created or de |
| motion | the state in which an object's distance from another is changing |
| balanced force | a nonzero net force, which changes the object's motion |
| unbalanced force | when the net force on an object does not equal zero; results in the object changing it's motion |
| trajectory | the curving path of an object in motion |
| reference point | a place or object used for comparison to determine if an object is in motion |
| speed | the distance an object travels in one unit of time |
| velocity | speed in a given direction |
| potential energy | energy that is stored and held in readiness |
| kinetic energy | energy that an object has due to its motion |
| thermal energy | the total energy of the particles in a substance or material |
| mechanical energy | kinetic or potential energy associated with the motion or position of an object |
| acoustic energy | sound energy |
| radiant energy | energy from the sun |
| propagate (waves) | how waves travel |
| longitudnal waves | waves that oscillate back and forth |
| transverse waves | waves that oscillate up and down |
| amplitude | total distance a wave moves from its resting point |
| wavelength | distance from one point on a wave to the corresponding point of the next wave |
| renewable resources | natural resources that can be renewed or replaced by nature |
| nonrenewable resources | natural resources that cannot be replaced once used |
| fossil fuels | materials such as coal that are burned to release their chemical energy |
| photovoltaic cells | devices used to convert sunlight into electricity |
