2. To practice using the scientific method to design and conduct an experiment To practice using the scientific method to design and conduct an experiment To think like a scientist To think like a scientist

3. Many brands of paper towels claim to be the strongest or most absorbent. Many brands of paper towels claim to be the strongest or most absorbent. Which brand of paper towel is the strongest or absorbent? Which brand of paper towel is the strongest or absorbent? Choose which question you will test. Choose which question you will test.

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

5. Wet strength is the strength of paper when wet. 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. This can be measured by the amount of mass that a wet paper towel can hold. Use the internet to learn what makes paper towels different from each other. Maybe look up prices as well Use the internet to learn what makes paper towels different from each other. Maybe look up prices as well

6. If different paper towels are tested for strength (__________, _______________, and ____________), then _____________ will be the strongest. If different paper towels are tested for strength (__________, _______________, and ____________), then _____________ will be the strongest.

7. Gather materials: 3 brands of paper towels 3 brands of paper towels Graduated cylinder Graduated cylinder basin basin Washers or pennies Washers or pennies Water (how much in mL) Water (how much in mL) Balance scale Balance scale scissors scissors

8. : what you will change (the ‘if’ part of the hypothesis) Independent Variable: what you will change (the ‘if’ part of the hypothesis) Dependent Variable: what changes based upon the independent variable. (the ‘then’ part of the hypothesis). Dependent Variable: what changes based upon the independent variable. (the ‘then’ part of the hypothesis). Constants: things that remain the same each time you perform the test. Constants: things that remain the same each time you perform the test.

9. 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! Indicate number of trials Indicate number of trials

10. 1.2.3.4.5.6.

11. Sample procedure idea Picture credit: www.tappi.org/paperu/fun_science/testStrength.htm

12. Create a data table that includes the trials and the average of all trials (the reduced data). Create a data table that includes the trials and the average of all trials (the reduced data). Create a graph, using of the average information (the reduced data). Create a graph, using of the average information (the 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

13. # : Title LabelLabel: Trial 1 Trial 2 Trial 3 Average Brawny##### Bounty#### Scott#### Always include an appropriate title Include a number Include labels for columns; include units!

14. Include a title and number Labels should include units where needed

15. Follow the directions to complete the conclusion template.