牛頓第二運動定律-加速度定律

In episode seven of the Shedding Light on Motion series, we answer the most important question that has ever been asked: how does a magician pull a tablecloth out from under a dinner set? No, seriously, we look at the so simple and yet so powerful equation F = ma. Newton Second Law tells us how to calculate the amount of force required to accelerate something by a given amount.