屋苑的十個energy changes

1.升降機:電能→動能→勢能(向上升後最高點)→動能

2.人們進出:化學能(人類進食後才有能量)→動能

3.有人高空擲物:化學能→勢能→動能(地心吸力)

4.人們坐在長椅上談話:化學能→動能(喉部震動)→聲能

5.保安密碼機:電能→聲能

6.大廈的電燈:化學能→電能→光能+熱能

7.有人用煤氣煮食:化學能(煤氣是燃料)→光能+熱能

8.屋苑停車場開/關閘:電能→動能



2010-02-13 11:46:04 補充：
9.爆水管:動能→聲能

10.屋苑火警，冒濃煙:化學能→光能+熱能→動能

花草樹木: solar energy --> Light energy --> chemical energy stored into the leaf
有人行路: Chemical energy --> Kinetic energy
車: Chemical energy --> kinetic energy
有人dang垃圾落樓: Potential energy --> kinetic energy
電燈: Electric energy --> Light + heat energy
電梯: Electric energy --> Kinetic + potential energy
有人打網球: Chemical energy --> kinetic energy
yiu yiu 板: interchange between kinetic energy and potential energy
水pump: eletric energy --> potential energy (因為pump 左上樓)
消防警鐘: electric energy --> sound energy

more difficult ones:
輕氣球: potential energy --> kinetic energy
有人仆低，喊: Chemical energy --> kinetic energy --> sound energy
噴水池: electric energy --> potential energy + kinetic energy --> sound energy (沙沙聲)

etc. 夠你用了