| a frame of reference that moves with the object, so that the moving object appears to violate Newton's laws of motion since it accelerates despite having no horizontal forces on it. |
non·in·er·tial frame  (nŏn'ĭ-nûr'shəl)  n. An accelerating reference frame for which Newton's laws of motion do not apply and in which force does not equal the product of an object's mass and acceleration. |