Why can't charged objects exert electrostatic forces on heavier objects?

Question

We know that, for example, amber rubbed with fur attracts bits and pieces of straw, paper, Styrofoam, etc. which are all light objects. Why don't they attract heavier objects, likewise?

Answer 1

The force is simply based on the amount of charge--it has nothing to do with the size or shape of the objects. With a very large or heavy object, it simply does not respond to the force the way lighter objects do. The coulomb force is simply determined by the charge on each object, and the distance:

https://en.wikipedia.org/wiki/Coulomb%27s_law

Keep in mind that an uncharged conductive object will have an "induced charge" when brought near a charged object.