Force | Basic Definition | SI Units

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A basic definition of force:


In simple words, force is any interaction that will change the motion of the object. Force can cause an object with mass to change its velocity with time. A force has both quantity such as magnitude and direction making it a vector quantity. 

 Force can be defined as an agent that produces the motion of the body in different ways which are following. 


  • Change the motion of the body
  • Retard or slow down the motion of the body 
  • Balance the forces already acting on the body 
  • Give rise to the internal stresses in the body 

In order to determine the effects of forces acting on the body, you must know the characteristics of the force which are following. 
  • The magnitude of the force
  • The line of action of the force 
  • The nature of the force
  • The point at which the force is acting 

Units of force:


M.K.S System: kilogram-force ( kg-f )

SI System: kg×m / s2  = Newtons (N)

Other Units: dyne, pound-force, poundal, kilopond, kip

1kgf = 9.81 N

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