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A vehicle of mass m is moving on a rough horizontal road with momentum P. If the coefficient of friction between the tyres and the road be μ, then the stopping distance is

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Important Questions on Friction in Solids and Liquids

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A 60 kg 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 0.5 and 0.4 respectively. The acceleration of the body is
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A ball of radius r and density ρ falls freely under gravity through a distance h before entering the water. The velocity of the ball does not change even on entering water. η,If viscosity of water is the value of h 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 20 m2. If the speed of the air is 180 km h-1 over the lower wing and 216 km h-1 over the upper wing surface, determine the plane's mass. (Take air density to be 1 kgm-3 and g=10 m s-2).
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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 4 m. A hole is opened at a height of 60 cm from bottom. The ratio of the area of the hole to that at a cross-sectional area at cylinder is 0.2. Then the velocity with which water is coming out is g=10m s-2
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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.