Class 11 Physics Work Energy Power Work done by a variable force

Work done by a variable force

  • The variable force is more commonly encountered than the constant force.
  • If the displacement Dx is small, we can take the force F (x) as approximately constant and the work done is then
    DW =F (x) Dx

For total work, we add all work done along small displacements.

Example: A force F = 3x2 start acting on a particle which is initially at rest. Find the work done by the force during the displacement of the particle from x =0m to x = 2m.


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