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Work done by variable force is considered one the most difficult concept.
12 Questions around this concept.
Work done by static friction on an object:
And work done by the variable force is given by -
Where is a variable force and is a small displacement
When Force is time-dependent
And we can write
So,
Where and are force and velocity vector at any instant.
Work Done Calculation by Force Displacement Graph
The area under the force-displacement curve with the proper algebraic sign represents work done by the force.
Work done by the frictional force is zero -
When the force applied on a body is insufficient to overcome the friction.
Work done by the frictional force is negative
When the force is large enough to overcome the friction
Work done by the frictional force is positive
When force is applied on a body, which is placed above another body ,the work done by the frictional force on the lower body
maybe positive.
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