Ok, so let us try to understand how to
find out the resultant of a coplaner
concurrent force system by using graphical method so, here we have shown the
concurrent force system and we have to  find out what will be the resultant of this
particular system, so here we are having
various forces, so this 200N force is the
pull type of the force acting on this
particular point, this 300 N
force is the push type of the force
then this 500 N force is the pull
type of the force and 400 Newton force
is the push type of the force. Now the
space between this particular forces is
divided by using the Bow's  notation so
this A B C and D this are known as the Bow's notation. According to the Bow's notation,
we can say that this AB is
representing this force of 200 Newton
which is of pull type similarly BC is
representing this 300 Newton force which
is of push type then this CD represent this
500 Newton force which is of  pull type
and finally this DA represent this
400 Newton force which is of push type.
Now let us try to understand how to  find out the resultant of this particular system
Now, we will  draw this  particular force
system. Now, as we have already seen this
is the space diagram and the angle
between these two forces, so angle
between these two forces is 50 degree and angle between these two forces is 70 degree. Now A B C D
are these Bow's notation as we have seen
already , now we will start with this particular
AB  so AB is representing these 200
Newton force so we'll take some suitable
force diagram scale or vector diagram
scale, suppose we will take one centimeter is
equal 100 Newton then we can say that
this 200 divided by 100 that is 2
centimeter will be the length by which
we will be representing this particular
force similarly BC is representing this
300N force and as we have
selected  a scale of one centimeter is
equal to 100N & therefore  300 /
hundred that  is 3 centimeter will be the
length by which we be representing
this particular force similarly this
CD will be representing this 500
newton force that is 5 centimeter and
DA will be representing this 400 Newton
force that is four centimeter by scale
so let us start with this particular
diagram that is the force diagram or
Victor diagram ,  so the first forces is
200N represented by this AB by 2 cm
 so we'll draw this 2
centimeter length then
so the first force that we have drawn is
of 2 cm length parallel to this 200 N force
the second force is BC draw a  line parrallel to this
300N force that is 3 cm  by scale the next force will be this particular force
so draw a line parallel to this 500 Newton force by 5 cm so this length will be 5
centimeter then from this point draw a line parallel to this 400N force
by 4 cm so once again try to
understand this so this 200 N force
is represented by AB
so a to b that vector is 2 cm then bc that vector is representing this
300 N force so it is 3 cm  in the downward
direction then this cd vector will be parallel this particular that is 500N
force and by 5 cm and then
from this to this  this particular vector
is of 400 divided by hundred that is 4 cm length and then the closing side of
this particular polygon will be the
resultant  of the given particular force
system
so ab and then cd and a' , now give the arrows appropriate arrows to this
particular diagram  then this is the closing
side and this aa' will be the
resultant of the given particular force
system graphically.  Now as you can see over
here we are having this particular
length aa' we have measured and this 5.3.
multiplied by  the scale, the scale that we have chosen is one cm is equal to 100 N
so 5.3 X 100 = 530 N
& it  is making an angle of
54.2 degree with the positive x-axis.
So in this way we can calculate the
resultant in magnitude and direction of
this particular co planer concurrent
force system
