Questions in Laws of Motion

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	The coefficient of static friction, ${\mu _s},$ between block A of mass 2 kg and the table as shown in the figure is 0.2. What would be the maximum mass value of block B so that the two blocks do not move? The string and the pulley are assumed to be smooth and massless. $(g = 10\,m/{s^2})$
	If mass of $A = 10\,\,kg$, coefficient of static friction = 0.2, coefficient of kinetic friction = 0.2. Then mass of B to start motion is
	A uniform metal chain is placed on a rough table such that one end of chain hangs down over the edge of the table. When one-third of its length hangs over the edge, the chain starts sliding. Then, the coefficient of static friction is
	A lift is moving downwards with an acceleration equal to acceleration due to gravity. A body of mass m kept on the floor of the lift is pulled horizontally. If the coefficient of friction is $\mu$, then the frictional resistance offered by the body is
	If a ladder weighing 250 N is placed against a smooth vertical wall having coefficient of friction between it and floor is 0.3, then what is the maximum force of friction available at the point of contact between the ladder and the floor
	Which one of the following statements is correct
	The maximum speed that can be achieved without skidding by a car on a circular unbanked road of radius R and coefficient of static friction $\mu $, is
	A car is moving along a straight horizontal road with a speed ${v_0}$. If the coefficient of friction between the tyres and the road is $\mu $, the shortest distance in which the car can be stopped is
	A block of mass 5 kg is on a rough horizontal surface and is at rest. Now a force of 24 N is imparted to it with negligible impulse. If the coefficient of kinetic friction is 0.4 and $g = 9.8\,m/{s^2}$, then the acceleration of the block is
	A body of mass 2 kg is being dragged with uniform velocity of 2 m/s on a rough horizontal plane. The coefficient of friction between the body and the surface is 0.20. The amount of heat generated in 5 sec is $(J = 4.2\,joule/cal$ and $g = 9.8\,m/{s^2})$

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