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20 Cards in this Set
- Front
- Back
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scientific method
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a logical approach to solving problems that lend themselves to investigation
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system
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a set of particles or interacting components considered to be a distinct physical entity for the purpose of study
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hypothesis
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a testable statement that serves as the basis from predictions and further experiments
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model
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a pattern plan, representation or description designed to show the structure or workings of an object, system, or concept
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theory
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a broad generalization that explains the body of known facts and phenomena
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quantity
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something that has magnitude, size or amount
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SI
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International system of units is the measurement system that is accepted worldwide
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Weight
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a measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe
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derived unit
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a unit of measurement that is a combo of other measurements
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volume
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a measure of the size of a body or region in three-dimensional space
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density
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the ratio of a mass of a substance to the volume of a substance; often expressed as grams per cubic for solids and grams per liter for liquids and gases
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conversion factor
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a ratio that is derived from the equality of two different units and that can be used to convert from one unit to another
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dimensional analysis
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a mathematical technique for studying dimensions of physical quantities
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accuracy
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a description of how close a measurement is to the true value of the quantity measured
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precision
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the exactness of a measurement
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percentage error
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a figure that is 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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a prescribed decimal place that determines the amount of rounding off to be done based on the precision of the measurement
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scientific notation
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a method of expressing a quantity as a number multiplied by 10 to the approximate power
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direct proportion
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the relationship between two variables whose ratio is a constant value
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inverse proportion
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the relationship between two variables whose product is constant
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