To practice the skills used in scientific investigations To practice the skills used in scientific investigations To think like a scientist To think like a scientist

Many brands of paper towels claim to be the strongest. Many brands of paper towels claim to be the strongest. Which brand of paper towel is the strongest? Which brand of paper towel is the strongest?

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. 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.

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. 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.

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

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

Independent Variable: Independent Variable: Dependent Variable: Dependent Variable: Controlled Variables: Controlled Variables:

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

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

Towel#pennies Mass (g) #pennies #pennies #pennies Trial 1 Trial 2 Trial 3 TotalAverage Brawny##### g g g g Bounty#### g g g g Generic#### g g g g g

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

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