If unit vectors $\hat{i}$ and $\hat{j}$ are along the x and y axes respectively, what is the value of $\hat{i} \cdot \hat{j}$?
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Question

If unit vectors $\hat{i}$ and $\hat{j}$ are along the x and y axes respectively, what is the value of $\hat{i} \cdot \hat{j}$?

Accepted Answer

Since $\hat{i}$ and $\hat{j}$ are mutually perpendicular unit vectors, the angle between them is $90^\circ$. Therefore, their dot product is $\cos(90^\circ) = 0$.

Motion in a Plane

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