2010 IIT JEE Physics Study Plan 18 September 2008

18 September Physics Friction – Ch.6 Session 7

Based on Text: Concepts of Physics, H C Verma, Part I

Do exercise problems 11 to 15

Before doing problems do a quick revision of the chapter and formulas.

Friction chapter formula revision sheet
http://iit-jee-physics.blogspot.com/2008/02/iit-jee-physics-formula-revision-6.html

From earlier chapter
Revise problems marked as difficult
If you have past JEE problems book go through problems related to the chapter.



JEE question 2007 paper I

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 degrees 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.

(A) Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1
(B) Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1
(C) Statement-1 is True, Statement-2 is False
(D) Statement-1 is False, Statement-2 is True


Correct choice: (C)

Coefficient of friction doesn’t depend on the angle of inclination of the plane.

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