作用与反作用力大小相等,方向相反。
Example 4:Action is equal to reaction, but it acts in a contrary direction.
还有一个例子证明作用力,与负反作用力相等。
That's another example where you see action equals minus reaction.
作用力等于反作用力,这是牛顿第三定律,因此Fij与Fji完全相等,但它们方向相反。
Actions equals minus reactions, according to Newton's Third Law, so this force, Fij, will be exactly the same as Fji, except in the opposite direction.
This is the thing about action and reaction.
这就是作用力与反作用力
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