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Urania

Joined: 30 Nov 2008
Posts: 1
Location: England

 Posted: Mon Dec 01, 2008 2:21 pm    Post subject: Newton's law of gravitation I know that if you hold a plumbline (or any object by a thread) near a mountain it will be pulled towards it. However, what happens if instead of a mountain, you are standing near a giant hole in the ground? Also what would happen if you held the plubline actually over the hole? Any information is much appreciated.
A physics teacher

Joined: 05 Sep 2009
Posts: 6
Location: Mauritius

Posted: Mon Sep 07, 2009 3:40 am    Post subject: Re: Newton's law of gravitation

 Urania wrote: I know that if you hold a plumbline (or any object by a thread) near a mountain it will be pulled towards it. However, what happens if instead of a mountain, you are standing near a giant hole in the ground? Also what would happen if you held the plubline actually over the hole? Any information is much appreciated.

the plumbline will be vertical. Since the would be only one force the weight of the bob.
You could throw in the the force due to the mass of the hole,s wall but their resultant you be zero.
Hope that will help you.
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