名词

1. 势头;冲劲;动力
If a process or movement gains momentum, it keeps developing or happening more quickly and keeps becoming less likely to stop.

2. (物理学中的)动量，冲量
In physics, momentum is the mass of a moving object multiplied by its speed in a particular direction.

1. the product of a body's mass and its velocity

e.g. the momentum of the particles was deduced from meteoritic velocities

2. an impelling force or strength

e.g. the car's momentum carried it off the road

Synonym: impulse