Write a note on work done by a variable force. Solution in Tamil
When the component of a variable force F ac!s on a body, the small work done ( dW) by the force in producing a small displacement dr is given by the relation
dW=Fcosθdr [ F cos θ is the component of the variable force F]
where, F and θ are variables. The total work done for a displacement from initial position ri to final position rf is given by the relation
W=∫rfridW=∫rfriFcosθdr
A graphical representation of the work done by a variable force is shown in figure given below. The area under the graph is the work done by the variable force.
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