Pedantic note: people say capsules 'burn up' from friction, but most of the heating comes from the air in front of the vehicle being compressed. The shield spends reentry sitting behind a layer of extremely hot gas.

Thank you. I have been correcting people about this at dinner parties for years and have stopped being invited to dinner parties.

Compression is the main term, though friction isn't zero. This is the point in the thread where someone links a textbook and we all learn the word 'stagnation'.