When constructing buildings architects need to take into account that there is a constant driving force going against us. That force is gravity which influences a change in the shape or movement of a body.  Newtons third law of motion ” For every force acting on a body, the body exerts a force having equal magnitude in the opposite direction along the same line of action as the original force”. Which translates to when building things like columns and beams that these things are sturdy and heavy and there needs to be a balanced to the point where the whole building wouldn’t crumble. The same goes for Arches which have to be able to support anything above them so they don’t slide apart.