PhyFl18–SS3.2.15 So then why does the Big ball fall at the same increasing speed as the small ball so that they hit the ground at the exact same time with the exact same speed? The answer is that the Big ball has 10X the resistance to fall than the small ball. Gravity puts 10X the force on it to get it to fall. The tennis ball has 10X LESS force pulling on it, but it only offers 1/10 of the resistance. It’s a perfect balance between force of the Earth’s gravitational pull and the relative resistance each object offers.