It holds for both, the difference is in what is classed as a successful result. With the physical sciences you expect the outcome of your experiment to be somet

It holds for both, the difference is in what is classed as a successful result. With the physical sciences you expect the outcome of your experiment to be something repeatable, as it implies you've understood the variables well enough to do so. On the other hand, with social science we accept that our knowledge of the variables is too limited to expect repeatability, so our experiments rely on statistical correlation in order to show whether a hypothesis was worthy of further exploration. In both cases, you need experimentation to back up your claims. Social science without experimental results is just collective dogma.