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Does the displacement arrow depend on the choice of reference point?
Wiki User
∙ 11y ago
Yes and no.
Some use "displacement" only to describe a change in the position of an object from some initial starting point to some ending point. That is, there is a distinction between "position" and "displacement." The position would be defined relative to a reference point. In that case the arrow depends only on where the particle was and where it ended up and the reference point does not matter.
Others use a definition for displacement which describes the difference between an object's position and a fixed reference point. That is, how far an object is displaced from a certain point even if the object had never been at that point. A distinction between position and displacement is not made. For this latter definition, the choice of reference point will make a difference in the direction of the arrow.
In physics problems one usually only cares about the changes in position (and velocity, etc) and the choice of reference point will not affect these.
Wiki User
∙ 11y ago
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Why you write S symbol for distance?
Strictly speaking, it's not. The symbol 's' is so often used for displacement because the symbol 'd' is often chosen for distance.This is an important distinction in physics, where differences between scalar (distance) and vector (displacement) types are used to measure and describe different things.============I believe that the standard explanation for the use of the letter s for distance is that the Latin word for distance is "spatium". Whether s (or d) is used to indicate distance or displacement, the distinction is that a right-facing arrow is placed over the letter to indicate displacement since it is a vector quantity.That said, it is probably not unheard of to find a textbook that uses d for distance and s for displacement, so long as their use is defined that way.
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