The multifunctional rail car is an integrated mechanics/kinematics experimental platform designed for middle schools, universities, and science popularization venues. It integrates track, power, measurement, data acquisition, and intelligent analysis into a mobile car, achieving "one car, multiple experiments, one lesson, multiple scenarios", helping teachers and students verify formulas, explore laws, complete competitions, and expand research with real physical phenomena. Hengli catapult, adjustable 0-2 N, used for uniform acceleration and kinetic energy theorem experiments. Typical experiments: uniform speed linear motion, free fall, inclined acceleration. Newton's Second Law, conservation of momentum, elastic/inelastic collisions. Conservation of mechanical energy, spring oscillator, and measurement of slope friction coefficient.