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28 Cards in this Set
- Front
- Back
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scientific method
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a logical approac to solving problemsby observing and collectiong data, formulating and testing hypothesis, and formulating theories that are supported by data.
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observing
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the use of senses to obtain information it involves measurements and collecting data.
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Qualative vs. quantitative information
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Qualative is descriptive and quantitative is numerical
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a system is a
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a apecific protion of matter ina given region of space that has been selected for study during an experiment.
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hypothesis
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a testable statement
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model
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used to represent ideas which cannot be easily viewed
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theory
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broad generalizations used to explain observations.
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quantity
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something that has magnitude, size or amount
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SI system
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the system internationale which includes 7 base units, also known as the metric system
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measurement standard
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an object or natureal ohenomena that is of constant balue, easy to preserve and reproduce, and pratical in size
-a means of comparison |
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length
mass time temperature amount of substance electric current luminous intensity energy |
meter
kilogram second kelvin mole ampere candela jule |
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Celsius to Kelvin
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degree C + 273 =K
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king henry died (monday)(laughing) (greedy) drinking chocolate milk
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km-hm-dam-m-dm-cm-mm
kl-hl-dal-l-dl-cl-ml kg-hg-dag-g-dg-cg-mg |
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dimensional analysis or factor label method
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method of solving problems based on cancellation of units
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formula for density
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D=m/v
density equals mass divided by volume |
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how do you find the volume of irregularly shaped objects
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water displacement
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volume of cylinders
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V= pi(r)2(h)
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what is accuracy
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closeness to the read value
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what is precision
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repeatability of a measurement, how many times you come close.
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percent error is calculated by
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value (accepted)- value(experimental)/ value(accepted) x 100.
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significant figures are
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valid figures actually obtained form a measurement.
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what are the rules for determining the number of significant figures.
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- all nonzero digits are significant
-leading zeros are not significant -captive zeros are significant -trailing zeros may or may not be significant |
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exact and perfect numbers
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measurements or counting and are infinite number of solutions.
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what is a graph
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a picture of data
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rules for making a good graph are
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-you label each axis with a unit and a description
-divide each axis evenly -plot and circle data points -draw a best fit line between data points |
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how do you find the slope
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rise over run
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direct and indirect proportions
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direct- when one goes up the other quantity goes up too
indirect- when one goes up the other goes down.(hyperbola) |
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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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