1.1-1.4

scientific law

a statement that summarizes a pattern found in nature

model

a representation of an object or event

scientific notation

a way of expressing a value as the product of a number between 1 and 10 and a power of 10

scientific theory

a well-tested explanation for a set of observations or experimental results

controlled variable

an experiment in which only one variable, the manipulated variable, is deliberately changed at a time

responding variable

the variable that changes on response to the manipulated variable

manipulated variable

the variable that causes a change in another

hypothesis

a proposed answer to a question or an educated guess

observation

information that you obtain through your senses

scientific method

an organized plan for gathering, organizing, and communicating information

biology

the study of the origin and behavior of living things

astronomy

the study of the universe beyond Earth

geology

the study of the origin, history, and structure of Earth

physics

the study of matter and energy and the interactions between the two through forces and motions

chemistry

the study of the composition, structure, properties, and reactions of matter

technology

the use of knowledge to solve practical problems

science

system of knowledge and the methods you use to find that knowledge

conversion factor

a ratio of equivalent measurements used to convert a quantity from one unit to another

line graphs

used to show the changes that occur in related variables

bar graphs

bars used to compare a set of measurements of amounts

circle graphs

a circle divided into sections or portions that shows how a part of something relates to the whole

density

the ratio of an objects mass to its volume (density=mass/volume)

slope

the ratio of the vertical change to the corresponding horizontal change (slope=rise/run)

inverse proportion

a relationship in which the product of two variables is a constant

direct proportion

a relationship in which the ratio of two variables is constant

accuracy

the closeness of a measurement to the actual value of what is being measured

significant figures

all the digits that are known in a measurement plus that last ones that are estimated

precision

the gauge of how exact a measurement is

volume

the amount of space taken up by an object (measured by m3)

mass

the quantity of matter in an object (measured by kilograms {kg)

length

the straight-line distance between two points (measured by meters {m)