Non-Inertial Reference Frames
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According to Section 1.2.1 Newton’s law in the form m a = F is valid in a reference frame that is fixed in space. Such a reference frame is an inertial frame. The notion of an inertial frame will be discussed in more detail in Section 6.2.
Sometimes, however, it is advantageous to describe the motion of a body relative to a moving frame of reference. For this reason we need to know the relationships between the kinematic quantities in fixed and in moving frames and we have to apply Newton’s law in a form that is valid in a moving reference frame.
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