This device is a desktop experimental system designed specifically for physics teaching in middle schools and universities. It visually verifies the physical law of "conservation of mechanical energy in the system only when gravity or elasticity does work" through mechanical motion visualization. Students can complete a complete data collection, calculation, and error analysis within 15 minutes without the need for additional software, truly "ready to use". Experimental content: Straight track: Verify mgh=189mv ². Arc track: Verify that mgh=189mv ²+189I ω ² (rolling expansion). Spring emission: Verify that half kx ²=half mv ² (elastic potential energy conversion). Flat throwing comparison: Compare the percentage of energy loss with and without friction.