牛頓第三運動定律-作用力與反作用力定律

In episode eight of the Shedding Light on Motion series, we look at that most poetic of all Laws. For every action there is an equal and opposite reaction. How does a rocket engine work? Why do guns recoil when fired? How do our muscles work? What propels us when we swimming? And how exactly is gravity a two-way interaction? All these questions, and many more, are answered in this excellent video.