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2014-10-02T21:35:32+05:30

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The frictional force acting on the block is 0. 
Frictional force acts only when a net external force acts on the object. And the frictional force acts in the opposite direction of external force preventing the impending motion.
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2014-10-04T02:30:31+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Frictional force acts on the block when the block moves and in the direction opposite to the movement of the block.

At the moment, the forces acting on it are weight of the block and the normal reaction. The block is in a static equilibrium. 

If the block is pushed by an external force in the horizontal direction, then static frictional force will increase from 0 to a maximum of 0.3 * 5*10 = 15 Newtons.
Once block starts moving the frictional force could be to a maximum of  0.1 * 50 = 5 Newtons.


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