Static friction force

Classical Mechanics Level 2

In the above diagram a force of 200 200 N is pushing a brick weighing 50 50 N against the wall, and the brick is static. If the coefficient of static friction is 0.5 , 0.5, what is the magnitude of static friction force on the brick (in N)?


The answer is 50.

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Srinivasa Satti by Srinivasa Satti

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2 solutions

Shuchit Khurana
May 3, 2014

the block is static. So friction= weight of the block.

14 Helpful 0 Interesting 0 Brilliant 0 Confused

So when the block is at rest whatever be the co-efficient of friction, its static friction is same?

Umang Vasani - 7 years ago

Static friction = normal reaction × coefficient of static friction

mitesh warang - 7 years ago

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limiting friction = normal reaction x limiting friction. but not static friction. static friction adjust according to the external force acting on it.

so, static friction = weight of the block

parvatham charunya - 6 years, 10 months ago

what normal reaction will u take in the quetion???

Akshay Iyer - 6 years, 12 months ago
Aslam Sufian
Jun 22, 2014

Third law - upwards force equals downwards force i.e. 50 N - That the 200 N push can support up to 100 N is inconscequental

2 Helpful 0 Interesting 0 Brilliant 1 Confused

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