air drag

基本解釋

Even if you remove gravity then there is friction, there's air drag.
即使沒有重力,摩擦和空氣阻力也會起到這個作用。
Now comes my last part, and that is, how does air drag influence trajectories?
現(xiàn)在是最后一部分，就是，空氣阻力如何影響軌道？
Of course, in reality, the baseball player knows better They give effect to the ball, they deal with air drag they spin the ball, and then these equations are not valid.
當(dāng)然，還是棒球選手更了解現(xiàn)實情況,他們用特殊的拋球方式減小空氣阻力,他們使球在飛行時帶自轉(zhuǎn)，這些公式就無法應(yīng)用了。

This low, air resistance creates drag, so the station is constantly slowing down and losing altitude—at the rate of about two miles of altitude every month.
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Since He is much less dense that air (He has only 14% of the density of air) the drag and flutter of the platters in the drives is reduced.
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There are so few air particles to create drag that a slow rotation can quickly accelerate into an uncontrollable spin.
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