Rocket Equation on Martin‘s Physics Clubhttps://martinphysics.club/tags/rocket-equation/Recent content in Rocket Equation on Martin‘s Physics ClubHugoen-US2020-2026 martinphysics.clubSat, 03 Apr 2021 17:19:03 +0000从牛顿第二定律到火箭运动方程https://martinphysics.club/posts/wp-100010/Sat, 03 Apr 2021 17:19:03 +0000https://martinphysics.club/posts/wp-100010/<p>从牛顿第二定律出发，由加速度、动量的定义可以得出动量定理：</p> <span class="math-expression" data-display="true"> F=m\frac{dv}{dt}\Rightarrow\Delta p=F\Delta t</span> <p>假设变质量时仍然满足动量定理，讨论合外力为0的简单条件下得出动量守恒定律：</p> <span class="math-expression" data-display="true">\Delta p=0</span> <p>对火箭，设箭体的对地速度为v，喷射气体对地速度为u，建立变质量动量守恒有：</p>