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Dear sir, In the problems related to smooth inclined plane; why don’t we resolve N(normal reaction) into two components -Ncos θ and Nsinθ? Why do we write N=mgcosθ? Why not Ncosθ=mg ?

Dear sir,
In the problems related to smooth inclined plane; why don’t we resolve N(normal reaction) into two components -Ncosθ and Nsinθ?   
Why do we write N=mgcosθ? Why not Ncosθ=mg ?

Grade:12

1 Answers

Khimraj
3007 Points
6 years ago
If you resolve like this then the net horizontal force parallel to ground on block is Nsinθ. Which is away from wedge. So block leave contact with wedge . Which is not possible so we can`t resolve like this. Hope it clears. Please if u like answer then approve the answer.

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