For #1-3 below, identify the independent variable, dependent variable and at least 3 variables that need to be controlled. 1. A student wanted to test how the mass of a paper airplane affected the distance it would fly. Paper clips were added before each test flight. As each paper clip was added, the plane was tested to determine how far it would fly.

Independent variable:

Dependent variable:

Controls:

2. Two groups of students were tested to compare their speed working math problems. Each group was given the same problems. One group used calculators and the other group computed without calculators.

Independent variable:

Dependent variable:

Controls:

3. An experiment was performed to determine how the amount of coffee grounds could affect the taste of coffee. The same kind of coffee, the same percolator, the same amount and type of water, the same perking time, and the same electrical sources were used.

Independent variable:

Dependent variable:

Controls:

4. Given an independent variable of light and a dependent variable of plant growth, come up with a description of an experiment and at least 3 controlled variables.