A visual teaching instrument designed specifically for the chapters of "kinetic energy theorem" and "conservation of mechanical energy" in high school physics. It uses "one track+two small balls" to complete qualitative and quantitative double verification in 2 minutes, solving the pain points of traditional experimental setup being cumbersome and having large errors. Single aluminum alloy track (surface anodized, friction coefficient ≤ 0.05), with a total length of 1.0 m, capable of continuously adjusting the inclination angle from 0 to 45 °, equipped with laser scale, with a minimum division of 1 mm. Teaching scenario: 4 people per group, complete all data acquisition within 3 minutes; Replace small balls of different materials and discuss the sources of energy loss; Can be connected to an external data collector for real-time plotting of Ek-h curves.