Quote:
Originally Posted by pzkpfw
Every gram of that 10kg object is in that field, and feels the acceleration due to that field. Every gram of that 1kg object is in that field, and feels the acceleration due to that field.
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Your answer is a good one, but it is really only part of the story. You have explained why a brick falls the same if broken in two pieces, but that's not anything unique to gravity. What's so special is that a brick falls the same as a bucket of water, or an iron bar.