动态摩擦

在天体物理学之中，动态摩擦描述一物体在空间中移动时，受到周遭其他物体的重力影响而损失动量与动能的现象。动态摩擦最早由钱德拉塞卡于1943年时提出并且进行详细的探讨。

考虑一颗质量为 $M$ 的目标星，假设一系统中之场星（假设质量为 $m_a \ll M$ ）速度为各向同性，则该目标星所受之动态摩擦可简单表示为

$\frac{d\mathbf{v}_M}{dt} = - 16 \pi^2 G^2 M m_a \ln{\Lambda} \left[ \int^{v_M}_0 dv_a {v_a}^2 f(v_a) \right] \frac{\mathbf{v}_M}{{v_M}^3}$

其中

由式中可得知仅有速度较目标星为慢的场星能够对目标星产生动态摩擦，而动态摩擦所造成之力的作用方向总是与目标星的行进速度方向相反。

单词	Dynamical friction
释义	Dynamical friction 中文百科动态摩擦在天体物理学之中，动态摩擦描述一物体在空间中移动时，受到周遭其他物体的重力影响而损失动量与动能的现象。动态摩擦最早由钱德拉塞卡于1943年时提出并且进行详细的探讨。考虑一颗质量为 $M$ 的目标星，假设一系统中之场星（假设质量为 $m_a \ll M$ ）速度为各向同性，则该目标星所受之动态摩擦可简单表示为 $\frac{d\mathbf{v}_M}{dt} = - 16 \pi^2 G^2 M m_a \ln{\Lambda} \left[ \int^{v_M}_0 dv_a {v_a}^2 f(v_a) \right] \frac{\mathbf{v}_M}{{v_M}^3}$ 其中由式中可得知仅有速度较目标星为慢的场星能够对目标星产生动态摩擦，而动态摩擦所造成之力的作用方向总是与目标星的行进速度方向相反。英语百科 Dynamical friction 动态摩擦 In astrophysics, dynamical friction, sometimes called gravitational drag, is loss of momentum and kinetic energy of moving bodies through gravitational interactions with surrounding matter in space. It was first discussed in detail by Subrahmanyan Chandrasekhar in 1943.
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Dynamical friction

动态摩擦

Dynamical friction 动态摩擦