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2015-03-18T07:00:38+08:00

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Yes, we should use a force in order to move object, a force is pull or push, human should be generate a force to  make one object in motion.
why do you use force to downward by itself?  you're indicating about the gravitational force of attraction of the object  it is a force of attraction between all objects that have a tendency to pull them toward one another.
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