PHYSICAL QUANTITIES IN LINEAR MOTION:

1.INERTIA :

LOOK AT A ROCK, DOES IT MOVE WHEN WIND BLOWS?
LOOK AT A BODY AT REST, UNLESS YOU PUSH OR PULL, IT CANNOT MOVE AT ALL.
LOOK AT THE SMOKE COMING OUT FROM A JET PLANE FOR  SOME SECONDS. YOU CAN SEE THE SMOKE IS MOVING SWIFTLY WITH A CONSTANT(SAME) SPEED.

ALSO LOOK AT THE FLOW OF A RIVER, EVEN IT MAY APPEAR SOMETIMES FLOWING  IN A CONSTANT SPEED.

ANY OBJECT WHICH IS AT REST OR ANY BODY WHICH IS MOVING AT A CONSTANT SPEED IS SAID TO POSSESS A PHYSICAL QUANTITY NAMED INERTIA.

INERTIA IS THE INABILITY OF A BODY ,TO CHANGE BY ITSELF ITS STATE OF REST               
 (OR)                                                         
INABILITY OF A BODY (WHICH IS  IN A LINEAR MOTION) TO CHANGE BY ITSELF ITS STATE OF CONSTANT (SPEED)MOTION.

INERTIA IS DIRECTLY PROPORTIONAL TO MASS .
i.e. IF THE MASS OF A BODY INCREASES , THEN INERTIA WILL ALSO INCREASE.
FOR EXAMPLE, A PAPER CANNOT STAY AT REST EVEN FOR A SMALL GUST (FLOW OF AIR), BECAUSE IT IS A LIGHTER OBJECT.i.e.ITS MASS  IS LESS.
BUT  A ROCK CANNOT FLY OR MOVE ,WHEN THERE IS A HEAVY FLOW OF AIR. BECAUSE ROCK'S MASS IS MORE THAN THAT OF A PAPER.
A BOOK ON THE TABLE WILL BE AT REST IF IT IS NOT GIVEN ANY EXTERNAL AGENCY CALLED FORCE.
FROM THE ABOVE EXAMPLES ,ROCK AND THE BOOK ARE SAID TO BE  IN INERTIA.

HOW TO GET CENTUMS AND WHICH LESSONS TO LEARN?(2010-11)

  1 MARKS 

( 30Q ) 1 MARKS  FROM BOTH THE VOLUME 1 & VOLUME 2 =>.( 30 * 1 = 30 MARKS )

     NOTE : MOSTLY PTA BOOK 1 MARKS AND LESS FROM BOOK BACK 1 MARKS WILL BE ASKED.

3 MARKS

    FROM VOLUME 1,(10Q) 3 MARKS =>  10 * 3 = 30 MARKS                                                     +   FROM VOLUME 2, {( 6,7,8,) OR (9,10 )} => ( 5Q ) 3 MARKS => 5 * 3 = 15 MARKS. 

     TOTALLY FROM BOTH THE VOLUMES ( 15 * 3 = 45 MARKS)

     NOTE: FOR 3 MARKS PROBLEMS CONCENTRATE MAINLY ON 2nd, 3rd, 5th and       9th LESSONS.

5 MARKS

   FROM 2nd & 7th LESSONS,( 4Q ) 5 MARKS ( INCLUDING PROBLEMS)                                                                                                                       => 4 * 5 = 20 MARKS

     1 COMPULSARY PROBLEM,( 1Q ) 5 MARKS => 1 * 5 = 5 MARKS                                         

   NOTE: FOR COMPULSARY AND 5 MARKS PROBLEMS CONCENTRATE MAINLY ON 1st, 4th, 6th and 7th  LESSONS. 

 TAKE ANY 2 LESSONS ( INCLUDING PROBLEMS ) FROM VOL.1 & VOL.2 => 2 * 5 =10

                                                                          TOTAL   =>  7 * 5 = 35 MARKS

10 MARKS 

  FROM VOLUME 1 OR VOLUME 2 ,( 4Q ) 10 MARKS  => 4 * 10 = 40 MARKS 

                                                                  TOTAL  => 150 MARKS

     

 

PATTERN FOR +2 PHYSICS PUBLIC EXAM

         1st VOLUME :

( 15 Q) 1 MARKS =>   15 * 1  =15
( 10 Q) 3 MARKS =>  10 * 3  = 30
( 6 Q )  5 MARKS =>    6 * 5   =30
( 4 Q ) 10 MARKS =>  4 * 10  =40
                                  
                                 TOTAL  =  115
         

           2nd VOLUME :

( 15 Q) 1 MARKS => 15 * 1 = 15
( 10 Q ) 3 MARKS => 10 * 3 = 30
( 6 Q ) 5 MARKS =>    6 * 5 = 30
( 4 Q ) 10 MARKS =>  4 *10 =40

                                   TOTAL  = 115

    (TOTAL) VOLUME 1 + VOLUME 2 = 230

                  TO GET CENTUM 150 / 200                                               ( BUT  YOU ARE ATTENDING OUT OF 230 MARKS REMEMBER ),

 1 MARKS : 30 / 30 => 30 * 1 = 30

 3 MARKS : 15 / 20 => 15 * 3 = 45 ( 6 PROBLEMS)
 5 MARKS :  7 / 12  =>  7 * 5 = 35 ( 1 COMPULSARY PROBLEM )
 10 MARKS : 4 / 10 => 4 * 10 = 40
                                TOTAL = 150