what are the two condition necessary for work to be done
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Two conditions must be met in order for work to be done on an object. The first is that the object moves. The second is that a force must act on the object in the direction the objectmoves.
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The work is given as
Work done = (F).(Disp) where F is the force vector and Disp is the displacement vector.
It is the dot product of two vectors hence, it is a scalar quantity.
|Work| = |Force|x|Displacement| x cosθ, where θ is the angle between the force and displacement vector.
The following can be inferred from the above formula and can be considered as necessary:
- For work to be done, a net force should be acting on the body.
- For work to be done, the body has to be displaced from its initial position.
- The force and displacement vectors should not have an angle of 90° between them as the value of cos90 is zero. So, the magnitude of work done will also be zero.
Therefore, for work to be done, the presence of a force acting on the body and the body should be displaced from its original position.
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