Experiments, variables and data

When is it OK to eat or drink at the lab tables?

• Always
• During group work, but not during lab activities
• Never
• During lab activities

You are heating a substance in a test tube. Always point the open end of the tube 

• away from all people
• toward another classmate
• toward your lab partner
• toward yourself

Anything in an experiment that can  be changed.

• models
• variables
• explanation
• qualitative data

A controlled experiment is one where

• you change only one variable.
• you change many variables.

The independent variable is the

• one you measure.
• one you change.

You can have more than one independent variable in a controlled experiment.

• True
• False

Mr. S. sets up an experiment to see how the mass of a ball affects the distance it rolls off a ramp.  Identify the independent variable.

• distance traveled by the ball
• height of the ramp
• mass of the ball
• weight of the ball

An Independent variable is the one that is changed in an experiment.  

• True
• False

Mr. S. sets up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. Identify the constant (controlled variable).

• distance traveled by the ball

• height of the ramp

• mass of the ball

• weight of the ball

Controlled variables (constants) are quantities that a scientist wants to change constantly.

• True

• False