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# Unit 2 Vocab

### Important vocabulary to know from Unit 2.

TermDefinition
Best-fit line an average of all the data points on a graph; a way to fit a data set to a linear pattern
Scientific model any method of representing the relationship between two variables
Graphical model a representation that shows how two variables are related on a graph so that the relationship is easily seen and understood
Physical model this is something that is made of materials that can be touched and measured that can be used to show how variable relate to each other i.e. a scale model
Conceptual model a written description or diagram based on ideas and observations that is used to describe how a process or object works; i.e. a blueprint or a statement of how two variables are related
Average speed how fast an object moves over a certain distance, on average
Instantaneous speed how fast an object is moving at a specific point in its journey
Slope of a position-time graph This represents the velocity of an object
Slope of a velocity-time graph This represents the acceleration of an object
velocity speed with direction; how much distance (and in which direction) an object covers in one unit of time
acceleration how much the velocity of an object changes in one unit of time (and the direction this happens in)
reference point point in space that is the "0" position; all other positions are measured relative to it
coordinate axis a fixed reference line with directions indicated; the object moves along this line
deceleration the term used for when an object is slowing down
problem solving steps 1. Looking for 2. Givens 3. Equation 4. Solution
constant velocity velocity that does not change i.e. movement at a constant rate, not slowing down or speeding up
Created by: davenportscience