"動力学" meaning in Japanese

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  "etymology_text": "From 動 (dō, “to move”) + 力学 (rikigaku, “mechanics”).",
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          "力",
          "りき"
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          "学",
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          "roman": "dōryoku",
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            [
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          "word": "動力"
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      "other": "どーりきがく"
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      "ipa": "[do̞ːɾʲikʲiɡa̠kɯ̟]"
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  "word": "動力学"
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  ],
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    {
      "form": "動力学",
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          "動",
          "どう"
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        [
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