3. nertial frames(惯性参考系) The reference frames to which newton s law applies(适用) are called" inertial frames The tendency of a body to remain at rest or in uniform linear motion is called“ inertia” No net force or No acceleration Can we find inertial frames in the nature?3. Inertial frames(惯性参考系): No net force or No acceleration • The reference frames to which Newton’s law applies (适用) are called “inertial frames”. • The tendency of a body to remain at rest or in uniform linear motion is called “inertia”. • Can we find inertial frames in the nature?