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Phys Sci-Ch 1

vocab words

QuestionAnswer
science system of knowledge and methods used to find that knowledge
technology use of knowledge to solve practical problems
chemistry study of the composition, structure, properties, and reactions of matter
physics study of matter and energy and the interactions between the two through forces and motions
geology the study of the origin, history and structure of Earth
astronomy study of the universe beyond Earth, including the sun, moon and stars
biology study of living things
scientific method organized plan for gathering, organizing and communicating information
observation information you obtain through your senses
hypothesis proposed answer to a question - must be testable
manipulated variable variable that causes a change in another
responding variable variable that changes in response to the manipulated variable
controlled experiment experiment where the manipulated variable is deliberately changed at a time. The responding variable is observed for changes - all other variables are kept constant
scientific theory well-tested explanation for a set of observations or experimental results
scientific law statement that summarizes a pattern found in nature - doesn't try to explain it
model representation of an object or event - makes it easier to understnd things that are too hard to observe directly
scientific notation way of expressing a value asthe product of a number between 1 and 10 and a power of ten - makes it easier to work with very large or very small numbers
length straight line distance between two points; SI unit =meter
mass quantity of matter in an object; SI unit = kilogram or grams
volume amount of space taken up by an object; number will be cubed; SI unit liters
density ratio of an object's mass to it's volume; D=M/V
conversion factor ratio of equivalent measurements that are used to convert a quantity expressed in one unit to another: example changing meters to kilometers
precision gauge of how exact a measurement is
significant figures all the digits that are known in a measurement plus the last digit that is estimated
accuracy closeness of a measurement to the actual value of what is being measured
thermometer instrument that measures temperature, or how hot or cold an object is
slope of a line; ratio of vertical change to the corresponding horizontal change or rise/run
direct proportion relationship in which the ratio of two variable is constant - Density and mass
inverse proportion relationship in which the product of two variables is constant - volume and density
System International A set of universal measurements that scientists all over the world use. (S.I.)
centi (c) hundredth
deci (d) tenth
mili (m) thousandth
kilo (k) thousand
deka (da) ten
base unit The seven metric units that the SI system is built on; mass is grams, meters is length, liters is volume, time is seconds and temp is Kelvins......
hecto (h) hundred
Created by: msparks