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action and reaction

Is action=reaction?And why?

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  • Anonymous
    9 years ago
    Favorite Answer

    action=reaction ga~!~我係讀中文中學ga~

    佢地係大小相同, 方向相反的~

    如果你諗唔到~就試下用e 個主邏輯去諗

    A 作用於B 既力= B 反作用於A 既力~

    eg. 放o係台面上有個5kg既盒~

    咁盒作用於台既力= mg = 5kg x 9.8 = 49N

    咁台其實係用緊49N 托住個盒~即係台反作用於盒既力係49N

    .

    你睇唔到reaction of an motion 係正常ga~

    因為有d motion 唔洗力ga~ 你有學過慣性inertia gala~都newton 2nd law

    有acceleration 就冇 force ~ 冇action and reaction pair la wor

    如果有acceleration~咁又要諗下d force applied 係邊

    eg. 一個人跳傘~開頭係有accelaration ga~

    action force 來自人既重量la~reaction 就作用左o係空氣到~

    o係motion 當中個人推開左好多空氣ga~因為空氣既粒子好細~而且唔集中~

    分佈o係身體分一串~所以空氣粒子對人既reaction 就好似細d la~

    咁空氣既移動~即係風la~咁睇唔到ga wor

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  • 9 years ago

    Newton's Third Law: For every action, there is an equal and opposite reaction.

    This is a very useful website about Physic

    http://www.physicsclassroom.com/Class/newtlaws/U2L...

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  • 9 years ago

    有action就會有reaction,但未必等如,如係堅硬地面,為方便計算,可以認同等如,例如你有50kg重,50kg就係action,你站立地上,地面亦有50kg嘅力承託起你,呢個就係reaction,但如你站立流沙上,reaction就唔等如action,你就會下沈。

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