Question

When will the work is minimum when the angel b/w force and displacement is (a)0degree(b)60degree(c)30degree(d)90degrees

Answer 1

The force will be minimum.when the angle between force and displacement is 90 degrees.


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Answer 2

work will be minimum when the angle is 90degrees because perpendicular bodies are independent and while force is perpendicular to displacement there will be not much work..
eg: pulling a toy truck with rope ...
when you pull rope straightly (perpendicular) then toy will move up rather moving on..
there fore work will be minimum when angle between force and displacement is 90 degree