? asked in 科學及數學其他 - 科學 · 1 decade ago

關於mass同weight一問

A : The weight of an object at a particular place is proportional to its mass.

B : Both the mass and the weight of an object very slightly at different place on the earth

以上既statements,,,邊個係岩..邊個係錯..

俾埋原因..點解個個岩,,點解另外個個錯~

萬分感激!!!!

2 Answers

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  • 1 decade ago
    Favorite Answer

    A is correct. B is incorrect.

    For A, weight = mass X acceleration due to gravity

    i.e. W = mg

    where g is the acceleration due to gravity (gravitationalfield strength), in which it can be treated as a constant.

    So, weight of an object at a particular place isproportional to its mass.

    For B, mass is a property of matter. That is it does not varyin different places. It should be the same at all places.

    Weight is a property of space. W = mg, The weight depends onthe magnitude of g, which can be varied. So it varies very slightly atdifferent places.

    Source(s): Myself~~~
  • 1 decade ago

    you may ask,

    why the manitude of g can be varied? (statement2)

    因為地球不停地轉動,會產生一種自轉離心力,因此物體所受重力的大小,等於地心引力和自轉慣性離心力的合力,應當是地心引力減去自轉慣性離心力在垂直方向的分量。因為地球是兩極稍扁的橢球體,越近赤道,地面與地心的距離越遠,地心引力也就越小。另一方面,越近赤道,物體隨地球自轉產生的自轉離心力卻越來越大,所以越近赤道,物體實際所受重力就越小

    參考資料:十萬個為甚麼—物理篇1(p.2)

    上述資料涉及中六課程,不過這本書是不分年級的-.-

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