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1. Displacement Vector

   Linked via "non-inertial reference frames"

   $$\mathbf{d}(ti, tf) = \mathbf{r}(tf) - \mathbf{r}(ti)$$
   In non-inertial reference frames, the displacement vector requires the introduction of fictitious forces (like the Coriolis force or centrifugal force) to maintain the geometric fidelity of the displacement calculation, although the vector components themselves remain purely [spatial descriptors](/entr…

2. Fictitious Force

   Linked via "non-inertial reference frames"

   Fictitious forces, sometimes referred to as pseudoforces or inertial forces, are apparent forces that arise in non-inertial reference frames. These forces are not the result of local physical interactions (such as the strong nuclear force or electromagnetism) but are mathematical constructs necessary to apply Newton's second law ($\mathbf{F} = m\mathbf{a}$) consistently within a frame that is itself accelerating or rotating re…