The drag force acts in the opposite direction to the path of the ball.
阻力方向与球的运行方向相反。
A force which ACTS on an object is opposed by an equal and opposite reaction.
作用于物体上的力会受到大小相等、方向相反的反作用力。
The product of a force and the time during which it acts is called impulse.
冲量就是力和它所作用的时间的乘积。
The product of a force and the time during which it acts is called impulse.
冲量就是力和它所作用的时间的乘积。
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