Explain subtraction of vectors.
Explain subtraction of vectors.
Subtraction of vectors can be defined in terms of addition of vectors.
We define the difference of two vectors $\overrightarrow{\mathrm{A}}$ and $\overrightarrow{\mathrm{B}}$ as the sum of two vectors $\overrightarrow{\mathrm{A}}$ and $-\overrightarrow{\mathrm{B}}$.
$\overrightarrow{\mathrm{A}}-\overrightarrow{\mathrm{B}}=\overrightarrow{\mathrm{A}}+(-\overrightarrow{\mathrm{B}})$
Thus, substraction of vectors means adding opposite of a vector in another vector.
In figure (a), $\vec{A}, \vec{B}$ and $-\vec{B}$ is represented.
In figure (b), $-\vec{B}$ is added to $\vec{A}$.
By triangle method for vector addition,
$\overrightarrow{\mathrm{R}_{2}}=\overrightarrow{\mathrm{A}}+(-\overrightarrow{\mathrm{B}})$
$\therefore\overrightarrow{\mathrm{R}_{2}}=\overrightarrow{\mathrm{A}}-\overrightarrow{\mathrm{B}}$
(For comparison, $\overrightarrow{\mathrm{R}_{1}}=\overrightarrow{\mathrm{A}}+\overrightarrow{\mathrm{B}}$ is shown).
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- [AIPMT 1988]
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