點解施力在物體上,物體會比番力你?(打爛沙盆問到篤)

Yes, you are right, it concerns with electrons.

Contact force is actually electromagnetic in nature. Electromagnetic force is one of the four fundamental forces (the other three are gravitational, strong nuclear interaction and weak nuclear interaction). It arises because of electrostatic repulsion between electrons of atoms.

When your hand pushes an object, the force experiences by your hand is the electrostatic repulsive force given by the electrons of those atoms in the object. The object, on the other hand, also experiences the same electrostatic force given by electrons from your hand. This is how action and reaction forces come from.

2008-10-09 22:23:42 補充：
Notice that electrostatic force is generally 10^20 times stronger than gravitational force. This is why you could safety pull up a person (electrostatice force against gravitational force) by grabbing his hands.

唔關電子事
電子邊有甘大力量
如果關電子事 甘你拎隻手店住d野
d野咪係甘向你施力?係人都知唔會

其實有d理論 只係有人發現自然中有呢種定律
可能冇得解釋

正如chem一樣
點解氧係氣體?點解金屬會同酸反應??
有d野係冇得解 只係有人發現有呢一種規律
希望幫到你