**accuracy**the degree to which a measured value agrees with correct value for that measurement

**approximation**an estimated value based on prior experience and reasoning

**classical physics**physics that was developed from the Renaissance to the end of the 19th century

**conversion factor**a ratio expressing how many of one unit are equal to another unit

**derived units**units that can be calculated using algebraic combinations of the fundamental units

**English units**system of measurement used in the United States; includes units of measurement such as feet, gallons, and pounds

**fundamental units**units that can only be expressed relative to the procedure used to measure them

**kilogram**the SI unit for mass, abbreviated (kg)

**law**

a description, using concise language or a mathematical formula, a generalized pattern in nature that is supported by scientific evidence and repeated experiments

**meter**the SI unit for length, abbreviated (m)

**method of adding percents**the percent uncertainty in a quantity calculated by multiplication or division is the sum of the percent uncertainties in the items used to make the calculation

**metric system**a system in which values can be calculated in factors of 10

**model**representation of something that is often too difficult (or impossible) to display directly

**modern physics**the study of relativity, quantum mechanics, or both

**order of magnitude**refers to the size of a quantity as it relates to a power of 10

**percent uncertainty**the ratio of the uncertainty of a measurement to the measured value, expressed as a percentage

**physical quantity**a characteristic or property of an object that can be measured or calculated from other measurements

**physics**the science concerned with describing the interactions of energy, matter, space, and time; it is especially interested in what fundamental mechanisms underlie every phenomenon

**precision**the degree to which repeated measurements agree with each other

**quantum mechanics**the study of objects smaller than can be seen with a microscope

**relativity**the study of objects moving at speeds greater than about 1% of the speed of light, or of objects being affected by a strong gravitational field

**scientific method**a method that typically begins with an observation and question that the scientist will research; next, the scientist typically performs some research about the topic and then devises a hypothesis; then, the scientist will test the hypothesis by performing an experiment; finally, the scientist analyzes the results of the experiment and draws a conclusion

**second**

the SI unit for time, abbreviated (s)

**SI units**the international system of units that scientists in most countries have agreed to use; includes units such as meters, liters, and grams

**significant figures**express the precision of a measuring tool used to measure a value

**theory**an explanation for patterns in nature that is supported by scientific evidence and verified multiple times by various groups of researchers

**uncertainty**a quantitative measure of how much your measured values deviate from a standard or expected value

**units**a standard used for expressing and comparing measurements

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