Pistemassaa
Pistemassaa is a term used primarily in Finnish-language physics literature to denote a point mass—an idealized object in which all of its mass is concentrated at a single point in space, with negligible physical size. In English, the standard term is “point mass.”
Definition and mathematical model
A pistemassaa is treated as a particle with mass m and position vector r(t). The mass distribution
Point-mass models are foundational in introductory mechanics, celestial mechanics, and orbital dynamics, where bodies are approximated
The term pistemassaa is not standard English; it is typically used to translate or adapt the concept
See also: Point mass, Dirac delta function, Newtonian mechanics, Gravitational two-body problem.