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The velocity-time graph of the figure shows the motion of a wooden block of mass which is given an initial push at =0 along a horizontal table.


(a)The coifficient of friction between the block and the table is
(b)
The coefficient of friction the block and the table is
(c)
If the table was half of its present roughness, the time taken by the block to complete the journey is
(d)If the table was half of its present roughness, the time taken by the block to complete the journey is

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Important Questions on Friction
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A block of mass slides along a floor while a force of magnitude is applied to it at an angle as shown in figure. The coefficient of kinetic friction is . Then, the block's acceleration is given by : ( is acceleration due to gravity)

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diameter of capillary,
rise of water,
Using and the simplified relation the possible error in surface tension is closest to:

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(Surface tension of water

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Given in the figure are two blocks and of weight and , respectively. These are being pressed against a wall by a force and kept in equilibrium as shown. If the coefficient of friction between the blocks is and between block and the wall is , the frictional force applied by the wall on block is:

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