Lightning Talk (No.1) - Only Initial Kinetic & Potential Energies Determine the Launch Angle of Longest-Range Projectile

詳細情報

日時	2026年01月31日 23:00 - 23:30
テーマ	Only Initial Kinetic & Potential Energies Determine the Launch Angle of Longest-Range Projectile
発表者	Chamonix_MBさん
集会名	VRChat International Science Community
発表資料

Abstract

Consider throwing a ball from a top of a cliff at an launch angle of θ. When the horizontal distance of the travel takes maximum, θ satisfies tan θ = √{ v₀² / ( v₀² + 2gh ) } = √{ K / ( K+P ) } with initial kinetic energy K = (1/2) mv₀² and initial potential energy P = mgh, where m is the mass of the ball, v₀ is the initial velocity, h is the cliff height, and g is the gravity acceleration. Interestingly, we can write θ in terms of K and P alone, and the logic can be explained without calculus. This talk is based on the following document written in Japanese: Kudo, T., Hara, N. & Shimoda, M. (2013). doi: 10.50835/kumako.5.0_116

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VRChat International Science Communityの開催情報・参加方法

VRChat International Science Community

開催日: 2026年01月31日

開催時間: 23:30 - 00:00

開催曜日: 土曜日

開催周期: 隔週

Let's talk about science! We hold LTs (Lightning Talks) hosted by group members about once every two weeks. Feel free to join usǃ There's absolutely no need to worry about not knowing anyone of the existing members․ We wish you a fruitful exchange․ Expected Level: University student (Year 1-2 undergraduate) level Field: Natural science (Physics, Chemistry, etc.) Time: For 30 min from Sat 14:30 UTC (6:30 PST, 9:30 EST, 15:30 CET, 23:30 JST) Language: English 【Short description in Japanese】さめさん主催のVRChat物理学集会の国際版集会です．使用言語は英語のみです．もちろんメンバーの中には日本語が分からない方もたくさんいます．英語の発表を練習したい理系の方歓迎です！