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Newton's Second Law is all based on F=ma! Acceleration is measured in meters per second per second, and mass is measured in kilograms. Acceleration is the rate at which velocity [speed in a given direction] changes. Say you have a suit case full of clothes and a suit case with no clothes, obviously the suit case that has no clothes will have a less mass. If the same amount of force [push or a pull] is applied to both suitcases the one that has less mass will accelerate the most do to the second law of motion.