# Chapter 2 Science Test

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### experiment

Tells/finds the relationship between variables

### scientific model

shows how each variable relates to another based on the results of an experiment

### physical model

a model you can look at, touch, feel, and take measurements from

### conceptual model

a way to show how something works that is descriptive in nature

### graphical model

a graph showing how two variables are related

### dependent variable

a variable that changes based on another variable

### independent variable

a variable that you control and change, the experimental variable

### experimental variable

a variable that you control and change, the independent variable

### y

the dependent variable goes on the _ axis

### x

the independent variable goes on the _ axis

### data

if a graph is created from accurate ___, the prediction will also be accurate

### cause and effect

the relationship between two variables is also known as a _______ relationship

### pattern

to have a relationship between variables, the graph must show a what?

### strong

a relationship where a small change in one variable makes a big change in the other is ____

### weak

a relationship where a big change in one variable has little effect on the other is ____

### inverse

a graph with a negative slope (points down to the right) shows what kind of relationship?

### velocity

a distance vs. time graph shows speed, whereas a position vs. time graph shows...

### position

where something is compared to where it started

### distance

an interval of length without regard to direction

### rise

the vertical change of a graphed line

### run

the horizontal change of a graphed line

rise over run

### average speed

total distance traveled divided by total time taken

### instantaneous speed

the speed at a specific point in your journey

Example: