Based on the physical phenomenon of u201Cfloating under a levitating liquid, u201D this paper designs and develops an interactive physics simulation and visualization platform for the liquid-levitation experiment. By solving a damped harmonic oscillator model under periodic driving, the platform simulates the resonant behavior of the gas layer and the dynamic process associated with an effective u201Cnegative gravity field.u201D This paper presents the physical modeling, platform design, technical implementation of the simulation system, and practical experience in using generative artificial intelligence to assist the development of physics experiments. The platform has been deployed on NuSEP and can provide a useful reference for the design, development, and optimization of similar physics simulation teaching projects.
To cultivate new military talents who are competent for combat-oriented and professionalized duties, university physics teaching in military academies should play an important role in developing cadets' scientific thinking, spirit of inquiry, and innovative awareness. Taking u201CThermal Radiation and Planck's Energy Quantum Hypothesisu201D as an example, this paper constructs a three-dimensional integrated teaching model featuring u201Ccontext-driven instruction, progressive thinking development, and value guidance.u201D Starting from practical problems in military engineering, following the logical process of scientific inquiry, and aiming at value cultivation, this model promotes the coordinated development of knowledge construction, ability enhancement, and educational objectives. This study provides a feasible paradigm for teaching reform in military academies and also offers transferable teaching strategies for science and engineering courses in regular universities. It has reference value for cultivating interdisciplinary talents with solid theoretical foundations, innovative thinking, and a strong sense of patriotism.
The u201Cruler cannonu201D is a mechanical device consisting of two closely placed rulers and a cylindrical projectile inserted between them; when a force is applied, the projectile can be ejected at high speed. The process involves complex changes such as energy conversion, strain energy, and frictional dissipation. This paper aims to systematically investigate the key parameters affecting the ejection velocity of the projectile and their underlying mechanisms. Based on the Euler-Bernoulli beam model, a theoretical model describing the ejection velocity is established. An integrated experimental platform with u201Cconstant-force generation, symmetric loading, and real-time force measurementu201D is independently constructed, and quantitative studies on the magnitude of the external force, projectile radius, and ruler length are conducted through controlled-variable experiments. The results show that, within the experimental parameter range, the ejection velocity is positively correlated with the external force and projectile radius, while it first decreases and then increases with increasing ruler length, exhibiting a distinct minimum point. The study also reveals the critical ejection conditions and the applicability limits of the model. This work not only deepens the understanding of the energy conversion and dissipation mechanisms in the u201Cruler cannonu201D system, but also provides theoretical and experimental references for the analysis and optimization of similar elastic-friction coupled mechanical systems.
When the bottom of a Slinky is fixed and its top is twisted several turns before being released, the system exhibits an intriguing u201Cdancingu201D motion: in addition to overall rotation, clear wave-like patterns can be observed from the side. In this work, we experimentally investigate this phenomenon and establish a corresponding dynamical model. The Slinky is modeled as an Euler-Bernoulli helical beam. In the zeroth-order approximation, a basic equation describing its periodic overall rotation is obtained. By retaining first-order perturbations, a dispersion relation for transverse bending waves is further derived, which explains the origin of the observed wave-like patterns. Experiments were carried out using Slinkies of different sizes, and the overall rotation period, steady-state angular velocity, transverse wave speed, and distance between adjacent wave crests were measured. The results show that the overall rotation period is linearly related to a combination of geometric parameters, the steady-state angular velocity is proportional to the initial number of twists, the transverse wave speed is independent of the initial twist, and the distance between adjacent wave crests is inversely proportional to the initial number of twists. The good agreement between theory and experiment verifies the validity of the model and provides a consistent physical explanation for this interesting phenomenon.
This paper investigates the intriguing climbing motion of magnets proposed in Problem 4 of IYPT 2025. The results show that the climbing motion originates from periodic stick-slip interactions. A theoretical model based on the magnetic charge method is established, and an experimental apparatus is constructed to systematically study the effects of the parameters of neodymium magnets and ferromagnetic rods. The results show that, within the critical range, the climbing velocity first decreases and then increases with increasing magnet length and ferromagnetic rod diameter. The climbing velocity decreases as the remanence of the magnet increases. In addition, as the distance between the constraint point and the magnet or the magnet diameter increases, the climbing velocity first increases and then decreases. The theoretical predictions agree well with the experimental results, providing a clear explanation of the physical mechanism and main influencing factors of the climbing motion.
