WORK ENERGY THEOREM

ANJANA M

NOAUTPN002

PHYSICAL SCIENCE

NSSTC OTTAPALAM

WORK

WORK IS SAID TO BE DONE WHEN A BODY UNDERGOES DISPLACEMENT IN

THE DIRECTION OF THE APPLIED FORCE. MEASURE OF WORK DEPENDS ON

APPLIED FORCE(F) AND THE DISPLACEMENT OF THE OBJECT ALONG THE DIRECTION

OF FORCE (S).

WORK MAY BE POSITIVE OR NEGATIVE. IT IS CONSIDERED AS POSITIVE IF THE

DISPLACEMENT IS ALONG THE DIRECTION OF FORCE AND IT IS CONSIDERED AS

NEGATIVE IF THE OBJECT IS DISPLACED OPPOSITE TO THE DIRECTION OF FORCE

ENERGY

ENERGY IS THE CAPACITY TO DO WORK. UNIT OF ENERGY IS SAME AS THAT OF

WORK AND IS JOULE. WE MAKE USE OF DIFFERENT FORMS OF ENERGY IN OUR

DAY TO DAY LIFE.

KINETIC ENERGY:�ENERGY POSSESSED BY A BODY BY VIRTUE OF ITS MOTION IS KINETIC ENERGY. �FLOWING WATER, MOVING VEHICLE, WIND ETC ARE EXAMPLES FOR OBJECTS �HAVING KINETIC ENERGY. THE KINETIC ENERGY OF AN OBJECT DEPENDS ON ITS �MASS (M) AND SPEED (V).

POTENTIAL ENERGY:� THE ENERGY POSSESSED BY A BODY BY VIRTUE OF ITS POSITION OR STRAIN IS �THE POTENTIAL ENERGY (U). STONE PLACED AT HEIGHT, WATER RESERVED IN �DAM, COMPRESSED SPRING, STRETCHED RUBBER BAND ETC ARE EXAMPLES FOR �THE OBJECTS POSSESSING POTENTIAL ENERGY.

WORK ENERGY THEOREM� WORK - ENERGY THEOREM STATES THAT WORK DONE IS EQUAL TO �CHANGE IN KINETIC ENERGY. WHEN CERTAIN FORCE IS APPLIED ON A BODY OF �MASS ‘M’ MOVING WITH VELOCITY U, ITS VELOCITY IS CHANGED TO V. �

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