Almost nothing about experiments. Physics is an experimental science, based on observation of nature.
Its treatments of experiments is as if they were mere side notes to the real thing. The Tools section might include something like a ruler, clock, or basic physical tools used to observe nature with.
I strongly disagree. Experiencing concepts first-hand through experiments improves learning and understanding, excites curiosity, and teaches practices that can be used in other disciplines.
I learned about many physics concepts with simple experiments in elementary school. They can certainly be extended and adapted for an adult audience.
What you say is true about learning physics. Not valid criticism against this site.
It's not meant to be the only source for learning physics. It is focused reference site for concepts. Having focus and focusing on just one viewpoint is a good thing.
> Physics is an experimental science, based on observation of nature.
I strongly disagree with this. In my first undergrad QM course I barely learnt anything about experiments. Experiments are quite important, but they are just side notes to the real thing.
Experiments are a way to check whether certain theories make sense, but not all theories. Many concepts have been proven mathematically, but have not yet been tested through experiments. Does that mean that theories are not part of physics? How do we know how elementary particles behave on a scale so small that we can’t observe their behaviour?
When we’re not able to acquire data, what's left for us is to construct new theories purely based on mathematics. Physics does not end where we can’t do observations, it actually starts exactly there.
Its treatments of experiments is as if they were mere side notes to the real thing. The Tools section might include something like a ruler, clock, or basic physical tools used to observe nature with.