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20 Cards in this Set
- Front
- Back
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system
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a specific portion of matter in a given region of space that has been selected for study during an experiment or observation
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hypothesis
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a testable statement
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model
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more than a physical object; usually an explanation of how phenomena occur and how data or events are related
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theory
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a broad generalization that explains a body of facts or phenomena
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quantity
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something that has magnitude, size, or amount
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quantity
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something that has magnitude, size, or amount
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kilogram
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SI standard unit for mass
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weight
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a measure of the gravitational pull on matter
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meter
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the SI standard unit for length
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derived units
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combinations of SI base units
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volume
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the amount of space occupied by an object
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milliliter / cubic centimeter
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interchangeable units when measuring volume
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conversion factor
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a ratio derived from the equality between two different units that can be used to convert from one unit to the other
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dimensional analysis
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a mathematical technique that allows you to use units to solve problems involving measurements
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accuracy
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the closeness of measurements to the correct or accepted value of the quantitiy measured
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precision
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the closeness of a set of measurements of the same quantity made in the same way
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percentage error
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calculated by subtracting the accepted value from the experimental value, dividing the difference by the accepted value, and then multiplying by 100
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significant figures
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consist of all the digits known with certainty plus one final digit, which is somewhat uncertain or is estimated
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directly proportional
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two quantities that, when divided by each other, gives a constant value;
y / x = k y = kx |
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inversely proportional
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two quantities whose product is constant
xy = k |
