An all-in-one activity tub contains everything you need to help students learn about simple machines—as they build marshmallow catapults, create their own pulley systems and more! You get 8 different experiment cards with involving activities based on national science standards. Plus, we’ve included tons of materials to complete each experiment and explore concepts in depth—from a spring scale and lever to a fun flip book, vocabulary cards and full-color charts that make concepts easy to grasp!