Why do objects of different sizes fall at the same speed, even though gravity has a larger pull on larger objects?
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Because objects require more force to accelerate them the same rate as lighter objects.
So let’s say you have one object with mass M, which has a gravitational pull G, and therefore accelerates at a rate A.
If you have a second object with mass 2M, it will have a gravitational pull of 2G, but in order to accelerate an object with mass 2M at a rate of A, you will need to have a force of 2G, which you do.
Another way to think of it is this. Take two objects of the same size in each hand. They should fall at the same rate, right? Well, why would their rate of fall change if you brought those objects in contact with each other? When you realize they shouldn’t, then you understand why a single object of double mass wouldn’t fall at a different rate either.
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