Research pulley systems, then design and build a simple machine to lift a box that uses less than half the force! Engage your students with an interactive STEM challenge. These activities are fun, hands-on learning experiences for middle school and upper elementary school kids. Lessons include engineering, math, science, physics, problem solving, & teamwork building ideas for the classroom. Inexpensive items needed. Project is TEKS & NGSS aligned. 5th 6th 7th 8th 9th