Grade 6, Chapter 6 Investigation Organizer:

**1. Plan It**

**Make five paper tubes that are 21-cm (8 1/2 in.) long.**
Use 8 1/2 in. by 11 in. paper.

- First decide on the diameter of the tubes you want to test.
- Calculate the size of the rectangle needed for each tube. Use C = ¼ x
*d*to find each circumference. Allow an extra 1-cm for the tube to overlap itself. - Cut the paper to the size you want. Roll the paper and secure the tube with tape.
- Measure to be sure the tubes have the diameters you want.

**Our planning completed**

**2. Put It Together**

** A. Put two desks close to each other. **

- Hang a paper cup over the tube.
- Place the tube over the space between the desks.
- Put two rolls of 50 pennies in the paper cup.
- Gently pull the desks apart, only 1 cm at a time until the tube falls.

** C. Repeat.** Repeat the steps with the other tubes.

**Our experiments completed**

**3. Wrap It Up**

**A. Discuss.** Discuss your data. What have you learned from your experiment? Which design works best?

**B. Design.** Design a bridge that can span a 40cm gap and support the weight of 100 pennies.

- Specify the length, the diameter, and the span of the tube or tubes in your diagram.

**Model completed**

**4. Discuss Your Results**

- How well did you use measurement?
- How well did you design your bridge?
- Is the data on your chart clear and complete?
- Did your group work together and share ideas?
- Explain how well your final diagram worked.

**Review completed**

Return to Investigation Page.

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