inertial
adj. C1 Advanced US //ˌɪˈnɝʃəɫ// UK //ɪnˈɜːʃəl// in·er·tial
adj. describing something that stays in its current state of motion or rest unless a force acts on it. It is a physics term for the property of matter that resists changes in speed or direction.
adj. relating to the property of matter that resists changes in its state of motion. Often used in physics to describe the tendency of an object to maintain its velocity unless acted upon by an external force.
The ball has an inertial force that keeps it moving.
When the car stops suddenly, the passengers continue moving forward due to their own inertial mass.
The spacecraft's trajectory is determined by its inertial momentum, which must be precisely calculated to ensure a successful rendezvous with the orbiting station.
From inertia + -al.