The sledge gained momentum as it ran down the hill. 雪橇从山上下冲时的动力越来越大。
Angular momentum can accompany nonrotational motion. 非旋转的运动可能伴随着有角动量。
The movement was gaining momentum. 这运动势头越来越大。
Those variables for which it holds (e.g., momentum and position, or energy and time) are canonically conjugate variables in classical physics. 那些具有的变量(如动量与位置,或能量与时间)是经典力学里的正则共轭变量。
According to this hypothesis, the solar wind could transfer energy and momentum to the plasma surrounding the earth only by wave motions along the magnetopause. 根据这项假说,太阳风只能靠磁层顶上的波动,来传递能量与动量给地球四周的电浆。
In classical mechanics, linear momentum or translational momentum (pl. momenta; SI unit kgm/s, or equivalently, newton second) is the product of the mass and velocity of an object. For example, a heavy truck moving rapidly has a large momentum—it takes a large or prolonged force to get the truck up to this speed, and it takes a large or prolonged force to bring it to a stop afterwards. If the truck were lighter, or moving more slowly, then it would have less momentum.