Problems for the 38th IYPT 2025 Approved by the IOC on 18 July 2024 Please refer to the official and signed pdf as the authoritative source. 1. Invent Yourself: Paper Boomerang Make a returning boomerang from a sheet of paper by folding and/or cutting. Investigate how its motion depends on relevant parameters. 2. Air Muscle Place a balloon inside a […]
IYPT 2025 Problems Problems for the 38th IYPT 2025 Approved by the IOC on 18 July 2024 Please refer to the official and signed pdf as the authoritative source. 1. Invent Yourself: Paper Boomerang Make a returning boomerang from a sheet of paper by folding and/or cutting. Investigate how its motion depends on relevant parameters. 2. Air Muscle Place a balloon inside a cylindrical net (as is sometimes used to wrap garlic) and inflate it. The net will expand and shorten. Investigate the properties of such a "muscle". 3. Lato Lato Attach a ball to each end of a string and connect the center of the string to a pivot. When the pivot oscillates along the vertical direction, the balls start to collide and oscillate with increasing amplitude. Investigate the phenomenon. 4. Climbing Magnets Attach a rod assembled from cylindrical neodymium magnets horizontally to a vertical ferromagnetic rod. Limit the motion of the magnets to the vertical direction. When the ferromagnetic rod is spun around its axis of symmetry, the magnetic rod begins to climb up. Explain this phenomenon and investigate how the rate of climbing depends on relevant parameters. 5. Dancing Slinky Twist a slinky several times and keep its bottom fixed. After releasing the top, the slinky starts to "dance" – wave-like phenomenon can be observed from the side-view. Explain the phenomenon and investigate the parameters affecting the slinky's motion. 6. Dripping Faucet A leaky faucet develops interesting dripping patterns, where the time between drops depends on the water flowrate. Investigate this phenomenon and study how it depends on relevant…