Ch 2 vocabulary terms

accelerate

to increase speed or change direction

acceleration

the change of speed over time

average speed

how fast something moves over a certain distance

conceptual model

a written description or diagram based on ideas and observations

deceleration

occurs when the change in speed or acceleration occurs in the negative direction

dependent variable

the variable in an experiment that changes in response to the choices made

free fall

the acceleration of a falling object under the influence of gravity

graphical model

a model that shows the relationship between two variables on a graph so that the relationship is easily seen and understood

gravity

the attractive force that exists between any two objects that have mass

independent variable

the variable in an experiment that is manipulated by the experimenter and that causes change in the dependent variable in the experiment; plotted in the x-axis of a graph

Instantaneous speed

the speed of an object at specific point

physical model

models that are made of materials that can be touched and measured

scientific model

a model that represents relationships between variables

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