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Question

An object of mass M is kept on a rough table as seen from above. Forces are applied as shown. Find the direction (from the vertical)  of static friction if the object does not move. 


  1. 37
  2. 45
  3. 53
  4. 30


Solution

The correct option is C 53
The net force acting on the block will be
Resultant force =152+202=25 N
 Angle with horizontal tan1(1520)=370

The direction of static friction is opposite to the direction of the resultant force its magnitude is equal to 25 N and it making an angle of 370 with horizontal and 900370=530 with vertical
 

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