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Scientific Method to the Rescue

Practice scientific investigation skills by determining the strongest brand of paper towel. This experiment involves testing the wet strength of different paper towel brands. Follow the step-by-step process, analyze the data, and draw a conclusion.

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Scientific Method to the Rescue

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  1. Scientific Method to the Rescue Will the strongest towel please stand up!

  2. Purpose • To practice the skills used in scientific investigations • To think like a scientist

  3. Problem/Question • Many brands of paper towels claim to be the strongest. • Which brand of paper towel is the strongest?

  4. Research • In research laboratories, papermakers test the paper they make for physical properties such as strength, absorbency, stretch, tear resistance, folding endurance, and stiffness. They also test for optical properties like transparency, opacity, brightness, color, and gloss.

  5. Research • Since paper towels are usually wet when they are being used, the “wet strength” of the towel is important. Wet strength is the strength of paper when wet. This can be measured by the amount of mass that a wet paper towel can hold.

  6. Hypothesis • _____ is the strongest paper towel. (Bounty, Brawny, Generic/school)

  7. Experiment Gather materials: • 3 brands of paper towels • Graduated cylinder • 2 jars with ring lid • Pennies • Water • Triple beam balance

  8. Variables • Independent Variable: • Dependent Variable: • Controlled Variables:

  9. Procedure • Step by step process to follow • Number the steps • Use complete sentences. • Be specific!

  10. Procedure 1. 2. 3. 4. 5. 6.

  11. Procedure 1. 2. 3. 4. 5. 6.

  12. Analyze Data • Chart including trials and reduced data (averages) • Graph of reduced data • Remember to label X and Y axis and give a specific title that relates to the purpose of the lab

  13. Chart

  14. Graph Use reduced data

  15. Conclusion First paragraph (5 sentences) • Restate the hypothesis. • Do you accept or reject your hypothesis? • Give 3 facts from your data that support the hypothesis. Look at your chart/graph. • In conclusion, ___.

  16. Conclusion Second paragraph (5 sentences) • How would you change this experiment if you repeated it? • How can this information be used? • Is it helpful information for individuals or society? • Who cares about the results?

  17. Congratulations! You can think like a scientist!

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