FORCE SYSTEM

FORCE SYSTEMBy Rani Rumita

ForceIs the action of one body to anotherTends to move a body in the direction of its actionThe action of force is characterized by (the effect of the action on one body depends on):Its magnitude (P)The direction of its action ()Its point of application (A)

Force MeasurementSI UnitsN (Newton)kN (kilo NewtonUS UnitsPound (lb)Klp (k) = 1000 pound

Garis Kerja GayaGaris yang panjangnya tak tentu yang terdapat pada vektor gaya tersebutTitik tangkap suatu gaya dapat dipindahkan ke titik lain yang terletak pada garis kerjanya, tanpa mengubah efek translational dan rotasional dari gaya terhadap benda yang dibebaniGaya yang bekerja pada benda tegar dapat dipandang bekerja di MANA SAJA di sepanjang garis kerjanya

Principle of TransmissibilityStates that a force may be applied at any point on its given line of action without altering the resultant effects of the force external to the rigid body on which it actsThus, whenever we are interested in only the resultant external effect of a force, the force may be treated as a sliding vector, and we need specify only the magnitude, direction and line of action of the force, and not its point of application

Force ClassificationExternal ForcesApplied ForcesReactive ForcesInternal ForcesThe resulting internal forcesDeformation distributed throughout the material of the bracket

(the relation between internal forces and internal deformations depends on the material properties of the body and is studied in strength of materials, elasticity and plasticity)

Contact vs body forceContact force is produced by direct physical contactBody force is generated by virtue of the position of a body within a force field such as a gravitational, electric or magnetic fieldConcentrated vs distributed forceAction vs reaction force

Concurrent ForcesTwo or more forces are said to be concurrent at a point if their lines of action intersect at that point

Triangle Law

The Parallelogram Law for The Addition of ForcesTwo forces acting on a particle can be replaced by a single force, called resultant, obtained by drawing the diagonal of the parallelogram which has sides equal to the given forces