Experimental Design & Variables

What step does every scientific experiment begin with?

• hypothesis
• question/problem
• procedures
• conclusion

What is an if....then... statement that predicts the outcome of an experiment?

• Conclusion
• Materials
• Hypothesis
• Problem

If I water the plant more often, then it will grow taller.  Name the independent variable.

• The height of the plant
• The size of the pot
• The amount of water
• The amount of light.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

If I water the plant more often, then it will grow taller.  Name the dependent variable.

• The amount of water.
• The amount of soil.
• The height of the plant.
• The amount of water.

Tags

NGSS.MS-LS1-5

If I water the plant more often, then it will grow taller. Which of these is not a controlled variable?

• The amount of soil.
• The pot size.
• The type of plant.
• The amount of water.

Tags

NGSS.MS-LS1-5

What you change in an experiment...

• Independent variable

• Dependent variable

• controlled variables

• data

What you measure, count, or observe as a result of what you changed.

• Dependent variable

• Independent variable

• Controlled variable

• scientific method

The parts of the experiment that remains the same.

• controlled variables
• data
• independent variables
• dependent variables

Mr. Gomez 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
• all of the above

Tags

NGSS.MS-PS2-2

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

• height of the ramp
•  distance the ball rolls
• mass of the ball
• weight of the ball

Tags

NGSS.MS-PS2-2