Decalogue I (1989) on Netflix

Krzysztof Henryk Baranowski lives in an apartment in Warsaw, with his young and inquisitive son Pawel Wojciech Klata. Pawel spends a lot of time with his father exploring computer programs. One snowy day, Pawel quickly solves a kinematics problem given by his father using the computer. And later he goes out for shopping in a cheerful mood but soon all the cheerfulness fades after seeing a poor stray dog's frozen corpse. Pawel returns home with a pensive mind, filled with sorrow, grief, and questions about Death. During the breakfast, Pawel asks his father ".. what is death?". At first, his father gives him the scientific explanation of death and then tells him that it is only the memory of a person which is left after death. Krzystof also denies the existence of the soul, calling it an alternate easier explanation for life and death.