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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=""

2.5 N
20 N
10 N
5 N

hint Hint:

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 force $equals mu R equals 0.4 cross times 25 equals 10$ N

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