# AP Physics Vocab Chapter 1

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```					Trevor Jin
AP Physics Vocab Chapter 1

1.  observation: use of one or more of the senses to gather information
2.  theory: a well-substantiated explanation of some aspect of the natural world
3.  test: trying something to find out about it
4.  model: a kind of analogy or mental image of the phenomena in terms of something else
5. law: statement about how things work in nature that seems to be true consistently
6. principle: like a law, but less general
7. precision: refers to the repeatability of the measurement using a given instrument
8. accuracy: refers to how close a measurement is to the true value
9. estimated uncertainty: plus or minus 0.1 cm is an example
10. percent uncertainty: the ratio of the uncertainty to the measured value, multiplied by
100
11. significant figures: the number of reliably known digits in a number
12. unit: amount used to measure something
13. standard: an exact quantity that people agree to use for comparison
14. meter: standard of length
15. second: standard of time
16. kilogram: standard of mass
17. unified atomic mass unit: used when dealing with atoms and molecules; (u)
18. SI units: Most important set of units in the science world
19. cgs system: set of units that uses centimeter, gram, and second
20. British engineering system: set of units that uses the foot, the pound, and the second
21. base quantity: defined in terms of standards
22. operational definition: rule of procedure for to define any quantity
23. conversion factor: what we use to change the units of a quantity
24. order-of-magnitude estimate: a rough estimate made by rounding off all numbers to
one significant figure and its power of 10, and after the calculation is made, again only
one significant figure
25. dimensions: these refer to the type of units or base quantities that make up a quantity
26. dimensional analysis: the process of using dimensions to work relationships
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Description: AP Physics Vocab Chapter 1