JEE Advanced 2007 Physics question
STATEMENT-1 : A block of mass m starts moving on a rough horizontal surface with a velocity v. It stops due to friction between the block and the surface after moving through a certain distance. The surface is now tilted to an angle of 30° with the horizontal and the same block is made to go up on the surface with the same initial velocity v. The decrease in the mechanical energy in the second situation is smaller than that in the first situation. because STATEMENT-2 : The coefficient of friction between the block and the surface decreases with the increase in the angle of inclination.
Solution
Statement-1: On the horizontal surface the entire kinetic energy is dissipated by friction. On the incline, part of the kinetic energy becomes gravitational potential energy and only the rest is lost to friction (the friction force is also smaller and acts
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