Find position vector using midpoint of two other vectors

In summary, the problem is to find an expression for the position vector of point R, which is located midway between two given points P and Q, in terms of the position vectors of P and Q. The solution is simply to take the average of the position vectors of P and Q, which can be represented as $\vec{r} = \dfrac{1}{2}(\vec{p}+\vec{q})$.
  • #1
TheFallen018
52
0
Hi, I've got this problem I'm trying to work out. The problem seems simple, but I don't think I have a good way to construct a way to solve it.

This is the problem.

Let P and Q be two points with position vectors p and q and let
R be a point midway between these two. Find an expression for
the position vector r of R in terms of p and q.

So, the midpoint of P and Q should be \[R=\frac{P+Q}{2}\], however I'm not sure how to turn each of these things into position vectors. Any help would be great. Thanks
 
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  • #2
Find an expression for
the position vector r of R in terms of p and q.

unless I'm missing something, it seems that you're making this more difficult than it really is ...

$\vec{r} = \dfrac{1}{2}(\vec{p}+\vec{q})$
 

FAQ: Find position vector using midpoint of two other vectors

What is the formula for finding the position vector using the midpoint of two other vectors?

The formula for finding the position vector is given by:
P = (A + B)/2
where P is the position vector, A and B are the two given vectors, and the division by 2 represents the midpoint.

Can the position vector be found using only one given vector and the midpoint?

No, the position vector cannot be found using only one vector and the midpoint. The position vector is a combination of two vectors and therefore, both vectors are required to find it.

Is the position vector the same as the midpoint vector?

No, the position vector and the midpoint vector are not the same. The position vector is the average of two vectors, while the midpoint vector is the vector that divides the line segment joining the two vectors into two equal parts.

What is the significance of finding the position vector using the midpoint of two other vectors?

Finding the position vector using the midpoint of two other vectors helps in determining the location of a point in between the two given points. This can be useful in various applications such as calculating the center of mass or finding the midpoint of a line segment.

Can the position vector be found if the two vectors are not perpendicular to each other?

Yes, the position vector can still be found if the two given vectors are not perpendicular to each other. The formula for finding the position vector works for any two vectors in 3-dimensional space, regardless of their orientation or angle between them.

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