The Latin word for distance is spatium. It's also the source of the English word space. For this reason, we will use s0 (s nought) for the initial position on a path, s for the position on the path any time after that, and Îs (delta s) for the space traversed going from the one position to another â the distance.
Another is social stigma, or the possibility of public advocacy due to such a factor. Critical mass may be closer to majority consensus in political circles, where the most effective position is more often that held by the majority of people in society.nother is social stigma, or the possibility of public advocacy due to such a factor. Critical mass may be closer to majority consensus in political circles, where the most effective position is more often that held by the majority of people in society.
We say it has no mass and no weight because it has no energy associated with zero velocity. We call this the rest mass, and for photons the rest mass is zero. Ordinary matter like protons and electrons have a rest mass, so we say they have nonzero mass and nonzero energy associated with zero velocity. Protons and electrons respond to gravity the way we expect particles with mass to respond, and they are the reason each of us has mass and weight.