Question

What should be the angle between the force and the displacement for maximum and minimum work?

CLASS - XI PHYSICS (Work, Energy and Power)

Answer 1

Work = f.s
         =fs cosΦ
i)  Minimum work
   cosΦ=cos90°
      Φ=0
  work =0
ii) Maximum work 
    cosΦ=cos0° 
        Ф=1
    work= fs
            

 

Answer 2

`theta ` = 0' and for minimum work `Theta ` = 90'.