How electromagnetic force makes the collision? What makes matter collide?. I guess electromagnetic force, one of 4 fundamental forces, makes collision. If it is, in the equal distribution of electric charge, matters will go through each other and collide will never happen. Then what causes collision? Is it a appliance of same principle of Rutherford gold foil experiment?
 A: Atoms on overall are electrically neutral but you asked how they interact then when they collide. It’s wrong to assume from the Rutherford experiment because he used a thin Gold-foil which are very large and only alpha particles or Helium nuclei were fired but when atoms collide they have a huge boundary of electron shells. Hence when it’s an atom-atom collision there is indeed repulsion between the electron clouds that are the shells of the atom and hence they can interact with each other such as bounce off elastically such as for gas atoms. 
But for the Rutherford experiment the Alpha particles had no electron shells hence most of them were undeviated as they were also very small compared to the radius of the whole atom. Hence it’s a different scenario when atoms with shells colliding. They just have a higher chance of interacting as atoms are more comparable to each other in-terms of size and both have negative charge on the outside so the positive nuclei rarely effect collision outcomes.
