Illustrate the workings of a system of gears and the basic concept of the laws of physics. When you turn one gear, the meshed teeth cause the other gears to rotate as well. The second gear turns in the opposite direction as the first, and the third gear turns in the same direction as the first. By meshing together a series of gears, you can transmit force from one place to another, as well as the change in the direction of applied motion. Handcrafted from replenishable and durable rubberwood, an eco-friendly sustainable and high-quality hardwood. Includes a Gear Train student model and teacher guide. Measures 10cm x 40cm L x 17cm H (4"W x 15-3/4"L x 6-3/4"H). Grades 2+. Ages 7+.