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# 運動定律

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• 也稱之為超距力

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## 牛頓第二定律

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12 2

g

### =

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### 

w = mg 為牛頓第二定律的一種特殊表示

• g 是由重力所產生的加速度

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21

12

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12

21

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r 及 r

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g g

g

g

g

g

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g

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## 牛頓定律的應用

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• 可以不管物體的轉動(到目前為止)

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• 那些作用於物體上的力的反作用力不需列入考慮

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g

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利用箭頭將作用力標示出來

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### 

若有二個以上的物體同在一個系統中，要將每 一物體的自由物體圖畫出

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x

y

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### 例題4.10

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## 摩擦力

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s

s

### n

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### fk = μ k

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### 例題4.11

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• 張力不再是外力，此時它是系統的內力

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### 例題4.14

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Edit Video Layer (Right click and drag, left click to set). Drag the strip

Choose output file type(Targa) Click “ANIM” button.. Step by

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On the course content page, click the function module to switch to different learning activities pages for learning; you can also directly click the &#34;learning activity&#34; in

* Attained: Accumulated at least 420 minutes of moderate- to vigorous-intensity physical activities across the week (60 x 7 = 420 minutes). 本星期體能活動總時間：

This is especially important if the play incorporates the use of (a) flashbacks to an earlier time in the history of the characters (not the main focus of the play, but perhaps the