KINEMATICS

KINEMATICS IS A BRANCH OF MECHANICS THAT STUDIES THE MOTION OF BODIES .A MOVING BODY IS ONE THAT CONTINOUSLY CHANES IT'S POSITION WITH RESPECT TO THE OBSERVER OR RECPECT TO ITS SRROUNDINGS .THERFORE IN ORDER TO STUDY OF PROPERTIES THE MOVING BODIES ,THE TIME TAKEN FOR CHANGES IN POSITION HAS TO BE MESURED AND RECORDED
VERY FEW THINGS MOVE AT THE SAME SPEED FOR LONG. MOVING CARS, AEROPLANES, PEOPLE AND ANIMALS ALL EVENTUALLY SPEED UP OR SLOW DOWN. ACCELERATION MEANS THAT A GREATER DISTANCE IS COVERED IN A SHORTER TIME. IN FACT, NEARLY EVERYTHING IN THE UNIVERSE IS CONSTANTLY ACCELERATING OR DECELERATING.

SPEED
SPEED IS DEFINED AS THE DISTANCE TRAVELLED BY A BODY IN UNIT TIME (1 SECOND OR 1 MINUTE OR 1 HOUR). SPEED IS A SCALAR QUANTITY.

DISTANCE
IT IS THE ACTUAL LENGTH OF THE PAT TAKEN BETWEEN TWO POINTS .THIS ACTUAL PATH NEED NOT HAVE FIXED DIRECTION

DISPLACEMENT
DISPLACMENT IS THE SHORTEST LEGHT IN A GIVEN DIRECTION BETWEEN TWO POINTS

VELOCITY
IS THE DISTANCE TRAVELLED BY A BODY IN UNIT TIME IN A GIVEN DIRECTION .VELOCITY IS A VECTOR QUANTITY.

ACCELERATION
ACCELERATION IS THE RATE OF CHANGE OF VELOCITY

GRAVTATIONAL ACCELERATION
GRAVITY IS THE FROCE WHICH PULLS ALL BODIES TOWARDS THE CENTRE OF THE EARTH KEEPS THE PLANET REVOLING ROUND THE SUN IN DEFINITE PATHS AND IS RESPONSIBLE FOR THE WEIGHT OF ALL OBJECTS. WHEN THE BODY IS RELEASED FROM A HEIGHT ,ITS VELOCITY INCRESES AS GRAVITATIONAL FORCE PULLS IT TOWARDS THE EARTH.