Why Newton's 3rd Law is Conservation of Momentum in Disguise
Newton's third law looks a little strange the first time you see it: all forces between particles come in equal-but-opposite pairs. But it's really all about a more intuitive physical principle: the conservation of momentum.
It implies that in an isolated system—meaning one where there are no outside forces acting on it—the total momentum will be conserved. And in this video, I'll explain why.
But there's a catch: Newton's third law isn't always true!