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A block placed on a horizotnal surface i...

A block placed on a horizotnal surface is being pushed by a force F making an angle `theta` with the vertical. If the friction coefficient is `mu`. How much force is needed to get the block just started. Discuss the situation when `tan thetaltmu`.

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The situation is shown in ure. In the limiting equilibrium the frictioN/Al force f will be equal to `muN`. For horizontal equilibrium
`F sin theta=muN`
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