phiysics project by nitin chandwani xi-b 22

8/3/2019 PHIYSICS PROJECT by Nitin Chandwani Xi-b 22

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ST STEPHENES SENIOR SECANDRY SCHOOL

AJMER

PROJECT ON PHIYSICS

TOPIC :-

SUBMITTED TO :- SIR DEEPAK

SUBMITTED BY :- NITIN CHANDWANI

XI-B

22

APPLICATIONS OF WORK ENERGY AND

POWER


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WORK

REFERS TO AN

ACTIVITY INVOLVING

A FORCE AND

MOVEMENT IN THEDIRECTION OF THE

FORCE. A FORCE OF

20 NEWTONS

PUSHING AN OBJECT

5 METERS IN THEDIRECTION OF THE

FORCE DOES 100

JOULES OF WORK


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Workcan be defined as transfer of energy. In

physics we say that work is done on an object

when you transfer energy to that object. If one

object transfers (gives) energy to a second

object, then the first object does work on the

second object

Work is the application of a force over adistance. Lifting a weight from the ground and

putting it on a shelf is a good example of work.

The force is equal to the weight of the object,

and the distance is equal to the height of theshelf (W= f x d)

Work-Energy Principle --The change in the

kinetic energy of an object is equal to the net

work done on the object.


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W=f x s

Unit of work done is

Newton n, meter m,

N-M or joules

IN THIS PICTURE WE CAN

SEETHAT THE YOUTH AREPUTTING THEIR FORCE TO

DISPLACE THE MUD THIS

SHOWSWORK DONE.


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Energy

Is the capacity fordoing work. Youmust have energy

to accomplish work- it is like the"currency" for

performing work.To do 100 joules ofwork, you mustexpend 100 joulesof energy.


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ENERGY can be defined as the capacity

for doing work. The simplest case ofmechanical work is when an object is

standing still and we force it to move. The

energy of a moving object is called kinetic

energy. For an object of mass m, movingwith velocity of magnitude v, this energy

can be calculated from the formula E= 1/2

mv^2.


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ENERGY

KINETIC POTENTIAL

ENERGY OF MOTION STORED ENERGY


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Power

IS THE RATE OFDOING WORK ORTHE RATE OFUSING ENERGY,

WHICH ARENUMERICALLYTHE SAME. IF YOUDO 100 JOULESOF WORK IN ONESECOND (USING100 JOULES OFENERGY), THEPOWER IS 100

WATTS


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POWER (P) IS THE RATE OF ENERGYGENERATION (OR ABSORPTION) OVERTIME:P = E/T

POWER'S SI UNIT OF MEASUREMENT ISTHE WATT, REPRESENTING THEGENERATION OR ABSORPTION OF ENERGY

AT THE RATE OF 1 JOULE/SEC. POWER'SUNIT OF MEASUREMENT IN THE ENGLISH

SYSTEM IS THE HORSEPOWER, WHICH ISEQUIVALENT TO 735.7 WATTS.

IN PHYSICS, POWERIS THE RATE ATWHICH WORK IS PERFORMED OR ENERGYIS CONVERTED. IT IS AN ENERGY PER UNIT

OF TIME. AS A RATE OF CHANGE OF WORKDONE OR THE ENERGY OF A SUBSYSTEM,POWER IS

WHERE P ISPOWER, W IS WORK AND T IS TIME


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THE END

I THANK SIR DEEPAK FOR GIVING METHIS OPORTUNITY TO PREPARE A

PROJECT ON APPLICATION ON WORK

ENERGY AND POWER.

phiysics project by nitin chandwani xi-b 22

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