| A | B |
|---|
| second | a common unit used in measuring time |
| time | a measurement that describes the interval between two events; the past, present, and future |
| English system | a system of measuring that uses length units of inches, feet, and miles |
| length | a type of distance measurement |
| distance | How far it is from one point to another |
| research question | A question that can be answered by an experiment or series of experiments |
| variables | factors that affect the result of an experiment |
| cause and effect | when one variable affects another |
| scientific method | a process used to solve a problem or test an idea about how things work |
| hypothesis | an educated guess about what will happen |
| investigation | a series of experiments connected to a basic question |
| measurement | an observation that can be recorded and thought about |
| scientific evidence | an observation that can be repeated with the same result |
| experiment | a situation that is set up in order to observe what happens |
| metric system | a system of measuring that uses length units of millimeters, centimeters, meters, and kilometers |
| experimental technique | how an experiment is done |
| trial | the running of an experiment |
| experimental variable | a variable that is changed in an experiment |
| controlled experiment | an experiment in which one variable changes and all other variables are kept the same |
| control variable | a variable that is kept the same in an experiment |
