Question: Does an electron and/or light follow the rules of momentum, power, gravity and so on...just on such a unmeasurable scale? So due to an electron(s) mass, isn't it impossible for it to go in a straight vector due to gravity caused by obviously larger pulling forces?

James Holloway answered on 18 Mar 2013:

Hi gummybear, here is my response from your older post:

“The law of energy conservation and the law of momentum conservation do count for electrons and light, and both also are effected by gravity. So yes they do follow those rules.

Electrons and light can travel in a straight line if they are free from other forces (no gravity, no electric field), or if they are traveling in the direction of the force.

That means if you drop an electron from rest then it will feel gravity, and fall downwards it in a straight line, so yeah its perfectly possible for light and electrons to travel in a straight line!”