Let your students discover the principles of the three basic classes of levers with the hands-on materials provided in this kit. Careful analysis of various lever arrangements will produce quantifiable data for determining the mechanical advantage of each lever type. As students pull on the levers they will personally experience the mechanical advantage of each lever type. Once discovered the principles can be applied to many everyday items such as wheelbarrows, shovels, scissors and hammers. The kit comes complete with meter stick, quality balance support, three knife lever clamps, weight hanger, spring scale, string, student laboratory experiments, and detailed teacher background. Each kit is useful for one student group. Purchase multiple kits for an entire class set. Slotted weights sold separately.