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  4. A block is lying static on the floor. The maximum value of static frictional force on the block is 10 N. If a horizontal force of 8 N is applied to the block, what will be the frictional force on the block?

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Q. A block is lying static on the floor. The maximum value of static frictional force on the block is $10\, N$. If a horizontal force of $8\, N$ is applied to the block, what will be the frictional force on the block?

Delhi UMET/DPMTDelhi UMET/DPMT 2009

Solution:

Static frictional force $ {{f}_{s}}=10\,N $ If $ F=8\,N $
$ {{f}_{s}}=8\,N $ for the given case. Because if force is applied and the body remains $m$ at rest, then static force is equal to applied force.

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