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A body of weight W is required to move up the rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by (where $$\mu $$ = $$\tan \varphi $$  = Coefficient of friction between the plane and the body)?

LohaHridoy
  1. $${\text{P}} = {\text{W}}\tan \alpha $$
  2. $${\text{P}} = {\text{W}}\tan \left( {\alpha + \varphi } \right)$$
  3. $${\text{P}} = {\text{W}}\left( {\sin \alpha + \mu \cos \alpha } \right)$$
  4. $${\text{P}} = {\text{W}}\left( {\cos \alpha + \mu \sin \alpha } \right)$$

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AhmedNazir

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Answer: Option 3

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