WORK, POWER AND ENERGY! (ACCORDING TO PHYSICS)

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Presentation transcript:

WORK, POWER AND ENERGY! (ACCORDING TO PHYSICS)

WORK APPLYING A FORCE OVER A DISTANCE THE OBJECT MUST MOVE IN THE DIRECTION OF THE FORCE

EQUATION: WORK = FORCE X DISTANCE or W=Fxd UNITS : J N m joules newtons meters

HOW MUCH WORK IS DONE IN EACH PICTURE?

POWER THE RATE AT WHICH WORK IS DONE (HOW FAST) EQUATION : POWER = WORK or P = W TIME t

Power is measured in watts which is one joule of work in one second and one horsepower equals 746 watts and a kilowatt is 1000 watts

EX)

CAN MACHINES REDUCE WORK? NO! THEY CAN ALLOW YOU TO USE LESS FORCE OVER A GREATER DISTANCE OR THEY CAN INCREASE DISTANCE AND SPEED WITH LESS FORCE

ENERGY ANYTHING THAT HAS THE ABILITY TO DO WORK IT CAN ONLY BE OBSERVED WHEN IT IS TRANSFERRED FROM ONE SYSTEM TO ANOTHER THERE ARE MANY KINDS OF ENERGY AND DIFFERENT WAYS TO CATEGORIZE IT IT IS ALSO MEASURED IN JOULES

POTENTIAL ENERGY (PE) STORED ENERGY OR ENERGY OF POSITION EX) A STRETCHED RUBBER BAND HAS ELASTIC POTENTIAL ENERGY

GRAVITATIONAL POTENTIAL ENERGY (PEg) ENERGY OF POSITION DUE TO GRAVITY DEPENDS ON AN OBJECTS MASS AND HEIGHT

FORMULA IF YOU KNOW MASS IN KILOGRAMS PEg = mgh or PEg = mass x gravity x height FORMULA IF YOU KNOW WEIGHT IN NEWTONS PEg = Fgh or PEg = weight x height

EX)

EX)

KINETIC ENERGY THE ENERGY AN OBJECT HAS DUE TO IT’S MOTION IT IS SIMILAR TO MOMENTUM KINETIC ENERGY = ½ X MASS X VELOCITY2

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