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The paper cup and ceramic mug were in the middle. indd 43 9/29/10 10:47 AM 44 man-made materials builDing the Future Scientists and engineers are working hard to come up with new and improved building materials that require less energy and materials to make, and that also save energy in the structures in which they are used. In many cases, the best solution involves the recycling of old building products. This saves energy and reduces construction and demolition waste. One material that has a long history of being recycled is metal.
Select several other metal objects from around your home or classroom and test them using the magnet as well. record the information on the data table. Use your observations to answer the questions in the analysis section. indd 54 9/29/10 10:47 AM magnificent metals 55 Quarter steel food can Painted steel Galvanized washer stainless-steel cutlery stainless-steel cookware Other items (list your own): Analysis Which items were strongly attracted to the magnet? Which items showed no attraction to the magnet?
In this activity, you will compare plywood with natural wood and test to see how plywood solves several of the common problems encountered during construction. -long (45-cm) piece of 1 in. x 6 in. indd 34 9/29/10 10:47 AM Building a Better World ● piece of plywood that is 18 in. (45 cm) long, 6 in. (15 cm) wide, and 5/8 in (15 mm) thick ● goggles ● heavy work gloves ● an adult to assist you 35 Safety Note During this experiment, you will be cutting and splitting wood using a hammer and chisel. Always wear work gloves and safety glasses.