Purpose: Let students understand the basic principles of kinetic and potential energy. Structure: This instrument is composed of three tracks, steel balls, and controllers with the same height and different paths. Operation: Connect the student power supply DC 12-16V to the terminal of the instrument, turn on the switch, and suck the three steel balls on the upper part of the track respectively, and then turn off the switch. The three steel balls move down the track from the same height, although three The steel ball has different paths, but in the end the steel ball will reach the end at the same time. This device features three parallel tracks with varying slopes or surface textures, allowing students to compare the descent speed and arrival time of balls rolling down each track—clearly demonstrating the conversion between gravitational potential energy and kinetic energy: the steeper the slope, the faster potential energy converts to kinetic energy, resulting in shorter travel time. Illustrates the conversion between potential energy and kinetic energy through comparative track experiments.