Physics-
General
Easy

Question

A horizontal force of 25 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.4. The weight of the block is
<img src="https://mycourses.turito.com/tokenpluginfile.php/c161933dbfaab094c54655ab71e9b8f0/1/question/questiontext/965284/1/1211149/Picture905.png" alt=""

  1. 2.5 N    
  2. 20 N    
  3. 10 N    
  4. 5 N    

hintHint:

mg=fs

The correct answer is: 10 N


    Given horizontal force F equals 25 N and coefficient of friction between block and wall open parentheses mu close parentheses equals 0.4
    We know that at equilibrium horizontal force provides the normal reaction to the block against the wall. Therefore, normal reaction to the block open parentheses R close parentheses equals F equals 25 N
    We also know that weight of the block open parentheses W close parentheses equals Frictional forceequals mu R equals 0.4 cross times 25 equals 10 N

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