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  4. A body of weight 50 N placed on a horizontal surface is just moved by a force of 28.2 N. The frictional force and normal reaction are

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Q. A body of weight 50 N placed on a horizontal surface is just moved by a force of 28.2 N. The frictional force and normal reaction arePhysics Question Image

Jharkhand CECEJharkhand CECE 2012

Solution:

Frictional force,
$ f=28.2\cos {{45}^{o}} $
$ =28.2\frac{1}{\sqrt{2}}=20\,N $
Normal reaction, $ R=50-28.2\text{ }sin\,{{45}^{o}} $
$ =50-20=30N $

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