SYSTEM OF FORCES

FORCE

                           Force is an agent or cause which when applied on a body , it tends to move along a straight line at a uniform velocity.

                           Force is a vector quantity having both magnitude and direction.

UNITS

1.       M.K.S – Kilogram force (kgf)

2.       S.I – Newton

3.       C.G.S – Dyne

4.       F.P.S – Powndal

                            F=mf
                                                      ·           1 n = 1 kg x 1 m/s²
                                    ·         1 kgf = gn ( g = accedcaration due to gravity )

                                    = 9.81 n

                                    =9.81 kg – m/s²

          1.       1KN = 10³ N

          2.       1MN = 10⁶ N

FORCE SYSTEM

·         COPLANER FORCE SYSTEM

                       The forces whose line of action lies on the same plane , called coplanar force system or coplanar forces.

  F1, F2, F3 are three co planar forces. 
  ·    COLLINEAR FORCE SYSTEM

                      The forces whose line of action lies on the same line , called collinear force system.

F1, F2, F3 are the co-llinear force.
   ·    CONCURRENT FORCE SYSTEM

                       The force which meet at a point are known as concurrent force system.

F1, F2 ,F3, F4, F5 are concurrent force.  
 ·     COPLANNAR COLLINEAR FORCE SYSTEM

                         The force system whose lines of action lies on the same plane and same line , called coplanar – collinear force system.

F1, F2 are two coplanar co-llinear force system. 
  ·    NON COPLANNAR FORCE SYSTEM

                         The forces whose lines of action lies on different planes, called non-coplannar force system

F1, F2, F3 are three coplanar concurrent forces
·    NON COPLANNAR CONCURRENT FORCE SYSTEM

The forces which meet at a point but their lines of action lies on different planes , are known as non coplanar concurrent force system.

F1, F2, F3 are three non coplanar concurrent.
   ·    NON COPLANNAR NON CONCURRENT FORCE SYSTEM

       The forces which do not meet a point and their lines of action do not lie on the same plane , are called non coplanar non con current force system.

   F1, F2, F3 are three non-coplannar non-concurrent force system.