WORK, POWER, ENERGY

                   WORK POWER AND ENERGY

WORK

WHEN A FORCE (F) IS APPLIED TO AN OBJECT THEN IT COVERS A DISPLACEMENT'S IN THE DIRECTION OF THE FORCE APPLIED. IT IS SAID TO BE THAT THE WORK HAS BEEN DONE ON AN OBJECT.

WORK = FORCE * DISTANCE

WORK = fs

POWER

POWER IS THE RATE AT WHICH ENERGY IS TRANSFERRED OR THE RATE AT WHICH WORK IS DONE.

POWER P = WORK DONE/TIME TAKEN

ENERGY

ENERGY IS DEFINED AS THE POTENTIAL OR THE ABILITY TO DO THE WORK

THERE ARE DIFFERENT FORMS OF THE ENERGY SOME OF THEM ARE LISTED BELOW:-

1. POTENTIAL ENERGY

2. KINECTIC ENERGY

3. HEAT ENERGY

4. ELECTRICAL ENERGY (ETC)

SI UNITS

1. MASS

IT IS QUANTITY OF MATTER CONTAINED IN THE BODY

UNIT OF MASS IS KILOMETER(KG)

1 QUINTAL = 100KG, 1TONNE = 10 QUINTALS = 1000KG

2. FORCE

THE UNIT OF FORCE IS NEWTON (N). THIS IS DEFINE BY THE NEWTON'S SECOND LAW OF MOTION.

F = ma

3. WEIGHT

IT IS THE FORCE WITH WHICH EARTH PULLS A BODY DOWNWARDS. ITS UNITS ARE THE SAME AS FOR FORCE

(a) UNIT OF WEIGHT IS NEWTON (N)

(b)GRAVITATIONAL UNIT OF WEIGHT IS KG-wt

w = mg NEWTONS = 9.8 NEWTONS

4. WORK

IF A FORCE F MOVES A BODY THROUGH A DISTANCE S IN ITS DIRECTION OF APPLICATION.

WORK DONE  W = F*S

(A) UNIT OF WORK IS JOULE (J)

5. POWER

IT IS THE OF DOING WORK. ITS UNIT IS WATT (W) WHICH REPRESENTS I JOULE PER SECOND.

1 W = I J/S

IF A FORCE OF F NEWTON MOVES A BODY WITH A VELOCITY OF V M/S THEN

POWER = F*V (WATT)