Most/all of the capacitors (which are mostly piezoelectric), the inductors, any ferrite beads, and of course thermal expansion. I'd also bet that liquid crystals change pressure when they rotate, but idk.
The glass moves quite a lot once I drop it.
Not so much with modern phones; the glass has gotten a lot stronger over the years. I can drop mine on hardwood with no visible effects and dropping it on concrete only causes cosmetic issues (chipped edges) without affecting functionality. I went caseless and screenprotector-less ~10 years ago and never regretted it.