Question

I wanna know if we say resultant of two forces suppose f1 and f2 is 2 and this resultant is along BD what does this line means that resultant is along bd?

Answer 1

By this we mean that the resultant force has direction vector along BD .

for ex there is a block placed at origin.

now if u apply a constant force on it from left then you would say that the block moves towards right and the force is also towards right.

so the direction of your force is towards +x axis which is nothing but force along +x axis.

thus by saying along 'abc' we mean that the direction of force is towards 'abc'

Please read NCERT

:-)