Simple Machines Screw

In Simple Machines: Screw, young learners in grades 1–3 will explore what a screw is and how it is useful. This 24-page title uses real-world examples of simple machine mechanisms and explains how these feats of engineering can make daily work less difficult to complete. The Simple Machines series for grades 1–3 explains how basic mechanical devices, that are used for applying a force, can help make daily tasks much easier. Featuring before- and after-reading activities, a glossary, an inde...