What are the differences between physical&mathematical model

[shivajikobardan]

Representation is of some system.

Physical model is the one where the representation is physical and tangible.
eg-: Hardware scale models, analog computer models.

Mathematical model is the one where the representation is done in the form of equations.
eg-: Supply demand equation

What are some other equations and differences in between these two?
For full context-:https://drive.google.com/file/d/1KvETzek_NB7nDyUIxpjfQItS_i0wczTX/view