A variable force displaces a body having mass M very gradually by an angle theta find the work done by this force.
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Answer:
Given,
mass=m,length=l,force=f,angle=θ
By the work energy theorem, since the change in KE is zero, so the total work done by all forces must equal to zero.
Thus,
W
f
+W
g
=0
Where W
f
is the final work done, W
G
is the initial work done.
W
f
=−W
g
W
f
=−mgl(1−cosθ)
Since W
g
=mgl(1−coθ)
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