momentumiin
Momentumiin is the illative case form of the Finnish noun momentumi, meaning momentum. In Finnish grammar, the illative case (ending -iin) indicates direction toward or into something, or into a particular state. Therefore momentumiin is used in sentences where one refers to moving toward momentum or entering a state characterized by momentum. The term momentumi itself is a loanword from Latin momentum and is used in physics to denote the quantity of motion.
In physics, linear momentum, or momentumi, is defined for a body as p = m v, a vector