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### 23 Cards in this Set

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 WORK FORMULA WORK = FORCE X DISTANCE w = f x d w = (m x a) x d TWO CATEGORIES OF WORK 1. WORK DONE AGAINST ANOTHER FORCE. 2. WORK DONE TO CHANGE THE SPEED OF AN OBJECT. WORK UNITS UNIT OF FORCE (N) xUNIT OF DISTANCE (m) (N x m) = JOULES (J) POWER FORMULA WORK DONE/TIME INTERVAL POWER = (m x a) x d ------------- TIME ENERGY ENABLES AN OBJECT TO DO WORK MECHANICAL ENERGY -ENERGY DUE TO THE POSITION OR MOVEMENT OF AN OBJECT FORMS OF MECHANICAL ENERGY -POTENTIAL ENERGY (PE) -KINETIC ENERGY (KE) -SUM OF THE TWO POTENTIAL ENERGY -ENERGY THAT IS STORED AND HELD IN READINESS -HAS POTENTIAL FOR DOING WORK -EX.=BOW IS DRAWN, ENERGY IS STORED IN THE BOW GRAVITATIONAL POTENTIAL ENERGY (GPE) -PE DUE TO ELEVATED POSITIONS -EX.=HAMMER UP IN PILE DRIVER GPE FORMULA WEIGHT x HEIGHT PE = (m x g) x h PE = mgh KINETIC ENERGY (KE) -ENERGY OF MOTION -DEPENDS ON OBJECT MASS AND SPEED KE FORMULA KE = ½ mass x speed² KE = ½mv² KE OF MOVING OBJECT FORMULA -NET FORCE x DISTANCE = KE -Fd = ½ mv² TRANSFER OF KE -KE OF MOVING OBJECT IS EQUAL TO THE WORK REQUIRED TO BRING IT FROM REST TO THAT SPEED. WORK/ENERGY THEREOM -NET WORK = ∆KE -WORK IS NOT A FORM OF ENERGY, IT IS A WAY OF TRANSFERRING ENERGY FROM ONE PLACE/FORM TO ANOTHER. LAW OF CONSERVATION OF ENERGY ENERGY CANNOT BE CREATED OR DESTROYED, IT MAY BE TRANSFORMED FROM ONE FORM INTO ANOTHER, BUT THE TOTAL AMOUNT OF ENERGY NEVER CHANGES. MACHINE MULTIPLIES OR CHANGES THE DIRECTION OF FORCES MACHINE PRINICPLES (ideal machine/no heat energy lost) -WORK(input)=WORK(output) -(Fxd)input = (fxD)output -input FORCE THROUGH A LARGE DISTANCE HEAVY LOAD IS MOVED A SHORT DISTANCE/VICE VERSA EFFICIENCY ENERGY OUTPUT OF MACHINE AFTER THERMAL ENERGY IS LOST EFFICIENCY FORMULA Eff = USEFUL ENERGY OUTPUT ----------------------------- TOTAL ENERGY INPUT CONSERVATION OF MACHINE ENERGY THE WORK OUTPUT OF ANY MACHINE CANNOT EXCEED THE WORK INPUT. KE/p COMPARISON KE -SCALAR QUANTITY -TOTAL KE OF 2 MOVING OBJECTS > EITHER OBJECT ALONE -DIRECTLY PROPORTIONAL TO SQUARE OF VELOCITY (½mv²) p -VECTOR QUANTITY -TWO p'S MAY PARTIALLY OR FULLY CANCEL. -PROPORTIONAL TO VELOCITY (mv) WORK DEFINITION -WORK EQUALS CHANGE IN KINETIC ENERGY w = ∆ KE