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A vehicle of mass is moving on a rough horizontal road with momentum . If the coefficient of friction between the tyres and the road be then the stopping distance is
(a)
(b)
(c)
(d)

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Important Questions on Friction in Solids and Liquids
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A body is pushed with just enough force to start it moving across a floor and the same force continues to act afterwards. The coefficient of static friction and sliding friction are and respectively. The acceleration of the body is

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A ball of radius and density falls freely under gravity through a distance h before entering the water. The velocity of the ball does not change even on entering water. If viscosity of water is the value of is given by

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In the houses far away from the municipal water tanks often water does not rise to the top floor. This happens because

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A plane is in level flight at constant speed and each of its two wings has an area of . If the speed of the air is over the lower wing and over the upper wing surface, determine the plane's mass. (Take air density to be and ).

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For a fluid in a steady flow, the increase in flow speed at a constriction follows

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A cylindrical tank is filled with water to a level of A hole is opened at a height of from bottom. The ratio of the area of the hole to that at a cross-sectional area at cylinder is Then the velocity with which water is coming out is

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Assertion: The acceleration of a body down a rough inclined plane is greater than the acceleration due to gravity.
Reason: The body is able to slide on an inclined plane only when its acceleration is greater than the acceleration due to gravity.

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Which one of the following is not used to reduce friction?
