Question

why do objects dro towards the ground if released?

Answer 1

I believe that the official statement is that we really don't understand the 'why?' behind gravity. If two objects have mass, they attract each other relative to the amount of mass they have and their distance. The effect that gravity has on an object based on distance is 1/(r^2) stating that for every time you increase the radius by 2 the effect of gravity is reduced by 4. http://www.youtube.com/watch?v=p_o4aY7xkXg this video may help a tad in the explanation. Good luck
-RF

Answer 2

Every object on Earth gets the gravitational force(gravity) from the Earth.
All object, universally, are 'attractive'.
and when you're holding an object, you're using your own energy, force to stop gravity from making it fall down. When you release it, you're not using your force anymore. So gravity wins.
That's why