Newton's Third Law of Motion
Since the person's face is softer than your hand it suffers more from the interaction. The Third Law is very important for space travel. In the cold void of space their is no air for jets to suck or for propellers to churn, and yet space ships can manouver in a vacuum. How do they do it? The engines propel gas particles out the back of the space ship. Since every force has an equal and opposite reaction force, the space ship will be propelled forwards. Because of the First Law space ships do not need very much fuel -- once they are moving they will stay in motion.
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