Students can construct, examine and explain simple machines to develop a deeper understanding of how they make work easier. Contains enough pieces to build a lever, pulley, inclined plane, wheel and axle and wedge; 5 machines at the same time. Modify machines with 4 included weights (1 of each 5 g and 10 g) and 8 included rubber bands to explore effort, force, load, motion and distance. Pieces assemble easily and separate to store. Includes activity guide.