Human Respiration and Circulation introduces Grade 4 students to real-world examples and fundamental concepts of forces, which will be explored in greater depth in later grades. Students will learn about observable effects of balanced and unbalanced forces on an object’s motion, describe and predict patterns of repeating motion, and explore how forces are associated with cause-and-effect relationships.

Students also learn that engineers use their knowledge of forces as they develop solutions to problems and build things that are useful to people. As a series of culminating activities, students explore the principles and practices of engineering design, such as scientifically defining a problem to be solved using magnets and evaluating and optimizing their possible solutions.