Like when a dog shakes his head back and forth. Or if you were to take a hand helicopter like this http://www.virginiatoy.com/v/vspfiles/ph鈥?/a> and spin it in opposite directions with your hands. Does anyone know the scientific term for this motion? Is there a term for it?What do you call the motion of something spinning back and forth on a central axis?Reciprocal or reciprocating motion.
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