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### 18 Cards in this Set

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 Scientific Method a logical approach to solving problems that lend themselves to investigation (observing/collecting data, formulating hypotheses, testing hypotheses, and formulating theories that are supported by data) System a specific portion of matter in a given region of space that has been selected for study during an experiment or observation hypothesis testable statement model a physical object or explanation of how phenomena occur and how data or events are related theory broad generalization that explains a body of facts or phenomena quantity something that has magnitude, size, or amount weight a measure of the gravitational pull on matter volume the amount of space occupied by an object density the ration of mass to volume, or mass divided by volume conversion factor a ration derived from the equality between two different units that can be used to convert from one unit to the other dimensional analysis a mathematical technique that allows you to solve problems involving measurements accuracy the closeness of measurements to the correct or accepted value of the quanity measured precision refers to the closeness of a set of measurements of the same quantity made in the same way percentage error calculated by subracting the accepted value from the experimental value, dividing the difference by the accepted value, and then multiplying by 100 Significant Figures consist of all the digits known with certainty plus one final digit, which is somewhat uncertain or is estimated Scientific notation numbers are written in the from Mx 10 ^ n, where the factor M is a number greater than or equal to 1 but less than 10 and n is a whole number Directional proportional characteristic of two quanitities by which dividing one by the other gives a constant value inversely proportional charactersitic of two quantities by which their product is a constant