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JEE Advanced2012PhysicsLaws of MotionActual

A small block of mass of 0.1 ~kg lies on a fixed inclined plane PQ which makes an angle with the horizontal. A horizontal force of 1 ~N acts on the block through its centre of mass as shown in the figure. The block remains stationary if (take g=10 ~m / s ² )

Options

  1. A=45^
  2. B>45^ and a frictional force acts on the block towards P.
  3. C>45^ and a frictional force acts on the block towards Q.
  4. D< 45^ and a frictional force acts on the block towards Q.

Correct answer

A. =45^

Step-by-step solution

The various forces acting on the block are as shown in the figure. When =45^ , = The block will remain stationary and the frictional force is zero. When >45^ , > Therefore a frictional force acts towards Q . When Therefore a frictional force acts towards P .

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