Explore the decomposition and synthesis of forces, explore the relationship between the distance, speed and time of the particle movement. The product should be stored in a dry, ventilated environment. Incredible physical laboratory equipment aid tool, or as a decoration in your lab,making physical experiment learning more efficient. The instrument consists of a base, a bracket, an iron ring and a steel ball. Good for school teaching tool, learning display, and collectibles, also will be a great addition to your lab supplies.