The Momentum Principle for multiparticle systems would seem to say that the center of mass of a system moves just as though the system were a point particle. This led Chris to ask, “Wouldn't that...

The Momentum Principle for multiparticle systems would seem to say that the center of mass of a system moves just as

though the system were a point particle. This led Chris to ask, “Wouldn't that mean that a piece of paper ought to fall in the

same way as a small metal ball, if they have the same mass?” Explain carefully to Chris the resolution of this puzzle.