When weight acting downwards is equal to air resistance acting upwards why is the object falling???
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Because an object is already in motion when those forces reach balance, and if the object were to slow down or speed up then it would throw the balance off.
Before reaching terminal velocity the body accelerating downwards is is being pulled harder by gravity than they are being lifted up by air resistance. But there is already some air resistance, and it continues to increase as gravity increases the speed of falling.
You can also balance the forces out so that an object floats and place. This is exactly what is happening with every boat, and with every balloon that it’s being held roughly at 1 place in the air column. But if you started already in motion downwards then all of that force would have to be dealt with before you could balance things out in order to have buoyancy. Independent on how much force it is that might be too much. For instance, dropping a boat out of an airplane it might break apart on hitting the water or even go below the water and fill up.
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