Understand the rules of vector addition and subtraction using analytical methods.
Apply analytical methods to determine vertical and horizontal component vectors.
Apply analytical methods to determine the magnitude and direction of a resultant vector.
Analytical methods of vector addition and subtraction employ geometry and simple trigonometry rather than the ruler and protractor of graphical methods. Part of the graphical technique is retained, because vectors are still represented by arrows for easy visualization. However, analytical methods are more concise, accurate, and precise than graphical methods, which are limited by the accuracy with which a drawing can be made. Analytical methods are limited only by the accuracy and precision with which physical quantities are known.
Resolving a vector into perpendicular components
Analytical techniques and right triangles go hand-in-hand in physics because (among other things) motions along perpendicular directions are independent. We very often need to separate a vector into perpendicular components. For example, given a vector like
in
[link] , we may wish to find which two perpendicular vectors,
and
, add to produce it.
and
are defined to be the components of
along the
x - and
y -axes. The three vectors
,
, and
form a right triangle:
Note that this relationship between vector components and the resultant vector holds only for vector quantities (which include both magnitude and direction). The relationship does not apply for the magnitudes alone. For example, if
east,
north, and
north-east, then it is true that the vectors
. However, it is
not true that the sum of the magnitudes of the vectors is also equal. That is,
Thus,
If the vector
is known, then its magnitude
(its length) and its angle
(its direction) are known. To find
and
, its
x - and
y -components, we use the following relationships for a right triangle.
If the perpendicular components
and
of a vector
are known, then
can also be found analytically. To find the magnitude
and direction
of a vector from its perpendicular components
and
, we use the following relationships:
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