Teach the mechanical principles of pulleys to a whole class! Using hands-on activities that are easily understood, this versatile set provides both intellectual and practical experiences. Includes 18 single-sheave pulleys, 12 double-sheave pulleys, 12 triple-sheave pulleys, 6 spring scales (500 g, 50 N), a roll of twine, 20 pulley chain links, and 32-page teacher guide with background information, reproducible student activity sheets, and assessment ideas.