venusyore 10 Posted January 13, 2014 Report Share Posted January 13, 2014 先自我介紹一下，我現在2x歲，高中只讀高一一學期就休學了，因為我身體因素無法去學校上課，但我一直沒放棄升學，最近透過我表弟知道這個論壇，我剛好遇到一些關念題不太了解，需要各位的協助，謝謝！ps ：我是自學。小敏在路上向右跑了200公尺，然後沿相同路徑步行折返150公尺，求小敏位移？課本是寫200-150=50可是不是末位-初位嗎?我自己算是50-0=50雖然答案相同，但我想知道課本的思路。 Link to post Share on other sites
司馬特 12 Posted January 13, 2014 Report Share Posted January 13, 2014 題目的想法是:假設一開始在原點 初位=0先向右200 再返回150所以 末位=200-150=50位移就是 末位-初位=50-0=50 Link to post Share on other sites
venusyore 10 Posted January 13, 2014 Author Report Share Posted January 13, 2014 謝謝你！我懂了!我好開心＾＾感恩 Link to post Share on other sites
venusyore 10 Posted January 13, 2014 Author Report Share Posted January 13, 2014 剛看了課本，上面只寫200-150=50 那只算出末位啊! Link to post Share on other sites
venusyore 10 Posted January 13, 2014 Author Report Share Posted January 13, 2014 還有一個步驟50-0=50 不是嗎@@？ Link to post Share on other sites
男孩 15 Posted January 13, 2014 Report Share Posted January 13, 2014 有些題目如果沒有特別提到初位置不等於0的時候通常最後那行會省略 Link to post Share on other sites
★羽翼 14 Posted January 13, 2014 Report Share Posted January 13, 2014 個人對直線上位移的理解是這樣：向右為正，向左為負。所以我會把解答解釋為向右200，向左150→200+(-150)=50 Link to post Share on other sites
HK_WongVic 10 Posted February 19, 2014 Report Share Posted February 19, 2014 我再補充一下，位移是 向量（有方向和數值）所以，你需要界定 方向例如，好像 羽翼 說的一樣，向右是正(+)，向左是負(-)那麼，向右跑了200公尺就等於+200 ，折返150公尺就等於-150位移 =(+200)+(-150) =+ 50 或者寫 50 (向右)如有錯誤，請指出 ^ ^ Link to post Share on other sites
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