Methode I: Using Graphical Method.
Choose a scale for the axes
Draw the vectors at the given angle
Complete the Parallelogram of vectors.
Measure the length R of the diagonal
Multiply R by the scale to get the resultant Vector.
Method II: Using the Cosine Rule.
Method III: By Resolving the Forces Horizontally and Vertically.
FV = y = 3N
FH = x+8 = N
A mass of 15kg is suspended using a string. The string is then pulled by a horizontal force F such that the string makes an angle of 300 with the down ward vertical.
(i) Tension in the string.
(ii) Horizontal force F.
A block of mass 2kg is pulled along a rough horizontal ground by a force of 120N, with the help of a string, which makes an angle of 600 with the horizontal. If the friction between the block and the ground is 50N,
(i) Resultant force on the block.
(ii) Acceleration of the block.