College Physics II – Mechanics, Sound, Oscillations, and Waves
Definition
Position is a vector quantity that refers to the location of a point in space relative to an origin. It is typically represented by coordinates in a given reference frame.
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Position is often denoted by the symbol $\vec{r}$ or $x$ in one-dimensional motion.
It is measured in meters (m) in the International System of Units (SI).
The position vector can change over time, indicating motion along a straight line.
Position can be positive or negative depending on its direction relative to the chosen origin.
Initial position ($x_0$) and final position ($x_f$) are used to calculate displacement.
Review Questions
What symbol is commonly used to denote position in physics?
How does position differ from displacement?
Why can the position have negative values?
Related terms
Displacement: A vector quantity that represents the change in position of an object. It is calculated as the difference between final and initial positions.
Reference Frame: A coordinate system or set of axes within which measurements are made. It provides a perspective for describing positions, velocities, and accelerations.
Scalar Quantity: A physical quantity that has only magnitude and no direction, such as mass or temperature.