動能和勢能

firstly,your concept is wrong.the energy stored in the ice is total internal energy but not PE.secondly, i don't know wheather your ice is melting or not.if the ice is melting,the energy stored is PE.but if it is not melting, energy stored is KT.
Also, PE of the ice is different from the PE of stone in your example.PE of the ice is the fouce between particle.In your example, the kind of PE is between the earth and the stone.when changing of statue, particles move far away from each other.so the PE increase due to the distance between particles increase.when changing of statue, the heat energy supplied by the heater is all used to oppose the energy between particles, that is PE between particles.as a result, there is only increase in PE but not KE.but after all particle complete changing of statue,that means all ice has changed into water, the energy stored will be in form of KE again.

http://img840.imageshack.us/img840/1701/79874382.jpg
自家制作 勢能動能轉換圖
你可以將地心吸力之類引力當成勢能,
而機械力就係動能.
最高點受地心吸力影響為勢能, 動能=0.
最低點受慣性影響而繼續擺動, 形成動能, 勢能=0.
而受地心吸力影響, 動能減少, 勢能增加.
反以唔係PE愈多, KE亦愈多.

溫度係量度能量既單位,
而熱能係會由高溫留去低溫,
因為冷熱間形成左一個階級, 就出現左一個"勢".

引力人人皆有, 視乎大小, 大如地球吸力亦只有10m每秒,
人與人間既引力更低得可以無視.
計引力公式F6會教:)

2010-09-06 19:41:45 補充：
ENERGY=PE+KE.
如果能量一樣, PE愈多, KE就會相應減少.

1.但點解轉移到冰塊既能量,會以PE儲存?
PE意義係咁解既咩?
Potential Energy between the particles forming the ice.
物態改變,PE增加,唔係應該動能增加咩?
PE increase means the distance between particles increases.
究竟係咩能量,克服左粒子間引力?
It can be many kind of energy overcome the attraction force between the particles