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Princess Shanya is pushing the boulder across the grave yard. Since it is heavier she has to use more force. This demonstrates Newtons 2nd law of motion.
SECOND LAW OF MOTION
Katniss is going to push Gale off the dock. Since Gale is light she does not require that much force to push, so Heather can save her energy to push President Snow off a cliff.
So, the second law of motion is that an object of less mass needs less force to move. An object with more mass needs more force to move.
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