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  • Work is defined as the force acting upon an object that causes an object to move.
  • It is defined as the product of the magnitude of force and the displacement due to force.
                   W=F x s

Here,    W= work done on an object
            F = Force on the object
            s = Displacement of the object

  • Work done depends upon 2 factors
  • Force: greater the force, greater the work done.
  • Displacement: greater the displacement, greater the work done.
  • When F=1N and s=1m then the work done will be 1Nm or 1J
  • 1 Joule is defined as the work done by an object when 1N Force is applied on that object and the object is displaced by 1m.
  • Work is Scalar physical quantity.
  • Work done is of three types.

POSITIVE WORK:  

  • When force and displacement acts on the same direction, then the work is said to be positive work.
  • In positive work, force applied by the object and displacement produce follows the same path.
  • When the value of angle (Ɵ) is less than 90°, the work is said to be positive.

NEGATIVE WORK

  • When force and displacement acts on the opposite direction, then the work is said to be negative work.
  • In negative work, force applied by the object and displacement produce follows the opposite path.
  • In this case, displacement is opposite to the direction of force.

Zero work done

  • When the displacement is perpendicular to the work done then the work done is said to be zero.
  • When the value of angle (Ɵ) is equal to 90°, the work is said to be zero.
  •   W= 0 as cos90°=0, therefore, work done is zero.

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