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AGC/United Learning • 1560 Sherman Ave., Suite 100 • Evanston, IL 60201 • 800-323-9084

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DARREN: WORK IS THE TRANSFER OF ENERGY FROM ONE SYS- TEM TO ANOTHER. IN THIS CASE, I’M TRANSFERRING THE ENERGY IN MY BODY TO THIS CAR. IF YOU WANT TO REDUCE THE AMOUNT OF ENERGY YOU NEEDED TO DO WORK, YOU NEED TO FIGURE OUT HOW TO MAKE THE ENERGY TRANSFER AS EASY AS POSSIBLE. IT’S SIMPLY SCIENCE, AND IT’S CALLED EFFICIENCY EVERYTHING WE DO REQUIRES ENERGY. THIS GASOLINE IS A MIXTURE OF PETROCHEMICALS DERIVED FROM FOSSIL FUELS AND ETHA- NOL, AN ORGANIC SUBSTANCE MADE FROM GRAIN. NOW, IN A MECHANICAL SYSTEM, WE TAKE THE FUEL AND CONVERT THE CHEMICAL POTENTIAL ENERGY, FIRST TO THERMAL EN- ERGY, THEN TO KINETIC ENERGY. AND IN A BIOLOGICAL SYS- TEM, THROUGH A SERIES OF ENERGY CONVERSIONS, WE TRANSFORM THE CHEMICAL POTENTIAL ENERGY OF FOOD INTO KINETIC ENERGY. THAT’S ENERGY CONVERSION. CHEMI- CAL POTENTIAL ENERGY TO KINETIC ENERGY. BUT NOT ALL THE ENERGY WE START WITH GETS USED WHERE IT COUNTS...HERE, WHERE THE RUBBER MEETS THE ROAD. SO WHERE DOES THE REST GO? BRYCE: HI. WANT SOME? COLLEEN: SURE. DARREN: HOW CAN WE GET THE MOST ENERGY OUT OF OUR FUELS? FOR THAT MATTER, CAN WE FIGURE OUT HOW MUCH ENERGY A FUEL CONTAINS IN THE FIRST PLACE? WELL, THE ANSWER IS IN THE BAG! KINETIC ENERGY. IT’S THE ENERGY POSSESSED BY A MOV- ING OBJECT. BRYCE: IF IT MOVES, IT’S GOT KINETIC ENERGY. CRAIG BULAWKA: BRYCE, THE EASIEST TECHNIQUE I COULD TEACH YOU IS A DIAGONAL STRIDE. BRYCE: OKAY. CRAIG BULAWKA: IT’S JUST LIKE WALKING. YOU PUT ONE FOOT IN FRONT OF THE OTHER. BRYCE: ALL RIGHT. CRAIG BULAWKA: AND THEN FOLLOW THROUGH WITH THE

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