[閒聊] 為什麼地心引力不需要消耗能量?
最近在查跟直升機有關的東西,突然想到直升機需要消耗很多的能量來抵抗
地球的重力,而一旦直升機燃料沒了直升機就會往下墜落
小弟突然覺得很怪
為何直升機施力要耗能量而地球的重力就像源源不絕的能量一樣完全不用消耗
任何東西就可以有力跑出來?
抱歉問題有點蠢 希望有板上高手幫我回答
--
※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 111.249.108.209
※ 文章網址: https://www.ptt.cc/bbs/Physics/M.1457851611.A.732.html
推
03/13 14:58, , 1F
03/13 14:58, 1F
小弟我念工科的不是物理,因次對能量的瞭解並不是很深入
推
03/13 14:59, , 2F
03/13 14:59, 2F
就是這個“力場”的力為什麼不需要靠消耗能量來產生 小弟不是很明白
→
03/13 14:59, , 3F
03/13 14:59, 3F
→
03/13 15:00, , 4F
03/13 15:00, 4F
→
03/13 15:06, , 5F
03/13 15:06, 5F
推
03/13 15:16, , 6F
03/13 15:16, 6F
→
03/13 15:16, , 7F
03/13 15:16, 7F
→
03/13 15:16, , 8F
03/13 15:16, 8F
→
03/13 15:16, , 9F
03/13 15:16, 9F
→
03/13 15:16, , 10F
03/13 15:16, 10F
對 我的問題就是你說的這樣
※ 編輯: danny555361 (111.249.108.209), 03/13/2016 15:20:16
推
03/13 15:23, , 11F
03/13 15:23, 11F
XDD感謝大大的回答 看來我離了解這個問題還有很遠的距離
※ 編輯: danny555361 (111.249.108.209), 03/13/2016 15:28:14
→
03/13 18:50, , 12F
03/13 18:50, 12F
→
03/13 22:05, , 13F
03/13 22:05, 13F
→
03/13 22:06, , 14F
03/13 22:06, 14F
→
03/13 22:07, , 15F
03/13 22:07, 15F
→
03/13 22:10, , 16F
03/13 22:10, 16F
→
03/13 22:10, , 17F
03/13 22:10, 17F
在頂樓會有反作用力支撐 也是因為直昇機受到重力才會有這個反作用力
大大的意思是反作用力和重力一樣不需要消耗能量嗎?
推
03/13 22:44, , 18F
03/13 22:44, 18F
→
03/13 22:44, , 19F
03/13 22:44, 19F
→
03/13 22:44, , 20F
03/13 22:44, 20F
→
03/13 22:46, , 21F
03/13 22:46, 21F
→
03/13 22:57, , 22F
03/13 22:57, 22F
→
03/13 22:57, , 23F
03/13 22:57, 23F
→
03/13 23:00, , 24F
03/13 23:00, 24F
推
03/13 23:02, , 25F
03/13 23:02, 25F
→
03/13 23:02, , 26F
03/13 23:02, 26F
→
03/13 23:02, , 27F
03/13 23:02, 27F
→
03/13 23:02, , 28F
03/13 23:02, 28F
→
03/13 23:03, , 29F
03/13 23:03, 29F
推
03/13 23:04, , 30F
03/13 23:04, 30F
推
03/13 23:19, , 31F
03/13 23:19, 31F
→
03/13 23:19, , 32F
03/13 23:19, 32F
→
03/13 23:19, , 33F
03/13 23:19, 33F
→
03/13 23:19, , 34F
03/13 23:19, 34F
還有 76 則推文
還有 9 段內文
→
03/15 15:43, , 111F
03/15 15:43, 111F
→
03/15 15:44, , 112F
03/15 15:44, 112F
→
03/15 15:44, , 113F
03/15 15:44, 113F
→
03/15 15:45, , 114F
03/15 15:45, 114F
→
03/15 15:46, , 115F
03/15 15:46, 115F
→
03/15 15:47, , 116F
03/15 15:47, 116F
→
03/15 15:47, , 117F
03/15 15:47, 117F
→
03/15 15:48, , 118F
03/15 15:48, 118F
→
03/15 15:49, , 119F
03/15 15:49, 119F
→
03/15 15:49, , 120F
03/15 15:49, 120F
→
03/15 15:50, , 121F
03/15 15:50, 121F
→
03/15 15:51, , 122F
03/15 15:51, 122F
→
03/15 15:52, , 123F
03/15 15:52, 123F
→
03/15 15:53, , 124F
03/15 15:53, 124F
→
03/15 15:54, , 125F
03/15 15:54, 125F
→
03/15 15:55, , 126F
03/15 15:55, 126F
→
03/15 15:56, , 127F
03/15 15:56, 127F
→
03/15 15:56, , 128F
03/15 15:56, 128F
→
03/15 15:57, , 129F
03/15 15:57, 129F
→
03/15 15:58, , 130F
03/15 15:58, 130F
推
03/15 19:00, , 131F
03/15 19:00, 131F
→
03/15 19:01, , 132F
03/15 19:01, 132F
→
03/15 19:03, , 133F
03/15 19:03, 133F
→
03/15 19:04, , 134F
03/15 19:04, 134F
→
03/15 23:12, , 135F
03/15 23:12, 135F
→
03/15 23:14, , 136F
03/15 23:14, 136F
→
03/15 23:15, , 137F
03/15 23:15, 137F
→
03/15 23:17, , 138F
03/15 23:17, 138F
→
03/15 23:17, , 139F
03/15 23:17, 139F
→
03/15 23:19, , 140F
03/15 23:19, 140F
→
03/15 23:20, , 141F
03/15 23:20, 141F
→
03/15 23:21, , 142F
03/15 23:21, 142F
→
03/15 23:25, , 143F
03/15 23:25, 143F
→
03/15 23:26, , 144F
03/15 23:26, 144F
推
03/16 10:25, , 145F
03/16 10:25, 145F
感謝各位大大回答 我應該得到我想知道的答案了
※ 編輯: danny555361 (140.113.186.247), 03/17/2016 05:21:09
推
03/19 01:12, , 146F
03/19 01:12, 146F
推
03/19 14:42, , 147F
03/19 14:42, 147F
推
08/19 10:28, , 148F
08/19 10:28, 148F
→
08/19 10:28, , 149F
08/19 10:28, 149F