As the name suggests, this is theforcethat is the result of
two, or more,forcesacting on an object. Asforcesarevector
quantities, theforcescannot just be added by
only taking into account the magnitude (size). The directions of theforceshave also to be
considered. If theforcesare all in a straight
line, the addition (or subtraction) of theforcesare straightforward,
which does not have to involve angles.
However, when theforcesare not in a straight
line, methods such as the triangle / parallelogram of forces and/ortrigonometrycan be used to
determine the resultant force. In the example below, trigonometry is
employed to help solve the resultant force of A and B.
Resolving force A into component forces in the vertical and
only theforcesand/or componentforcesin the vertical and
horizontal directions are dealt with.
Using thePythagorean theorem,
the magnitude of the resultant force can be calculated, and usingtrigonometry,
the angle or direction (angle) can be determined.
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