Building Shape Models Practice Test

Problem: Books slid off when Maya carried them to the rug. At the building station, Maya and Chen built a tray model from a shallow box. Materials: shallow box, cardboard strips, tape. Shape features: they added raised edges on all four sides. They tested it by putting books on the tray and walking. The books stayed on the tray and did not slide off. The edges acted like walls to keep items in. The model showed the shape helps the tray work. How did the edges help when they tested it?​

Problem: Water spilled when Carlos poured into a small bottle. At the building station, Carlos and Keisha built a funnel model from paper. Materials: paper, tape, bottle, cup of water. Shape features: the funnel was a cone with a wide top and narrow bottom. They tested it by holding the narrow bottom over the bottle. Then they poured water into the wide top. The water went into the bottle with less spilling. The model showed the shape guides water where it should go. Which shape feature makes the model work to solve the problem?​