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http://www.wired.com/2015/06/thors-hammer-weird-center-mass-avengers/
IN THIS QUICK clip from Avengers: Age of Ultron (you can see it here), Thor tosses his hammer (Mjölnir) up into the air and catches it. Why does he do this? Because he’s Thor. That’s just what Thor does.
It might seem like a simple trick, but is there any hidden physics here? YES! After the hammer leaves Thor’s hand, there is only one force acting on it—the gravitational force. Even though the hammer is rotating while in the air, the center of mass should move just like a point particle.
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