Some roofs caved in. Roofs crashed down on a soup company in Ohio, a restaurant in Michigan, and a school in New Hampshire. Ask a good question. A model is a copy of an object that is too big, too small, or too complicated to study easily. A toy ship, for example, is a small model of a big ship.
Engineers use models to test and study how well things are built.
Spread newspaper over your testing area. Cut out one end of the shoe box. Then use the stiff paper to make the three roof shapes shown in the pictures on the right. To test each roof, put it in the shoe box as shown in Step 2. Keep watching the roof through the open end of the box.