Physics Help Forum Stability Issue Help

 Equilibrium and Elasticity Equilibrium and Elasticity Physics Help Forum

 Apr 13th 2013, 07:38 AM #1 Junior Member   Join Date: Apr 2013 Posts: 5 Stability Issue Help Can anyone help to explain why the possible centre of gravity is at position D as in the attached photo? Attached Thumbnails
Apr 13th 2013, 09:26 AM   #2

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 Originally Posted by Alexis87 Can anyone help to explain why the possible centre of gravity is at position D as in the attached photo?
They're just trying to mess with you. D is not a possible answer.

-Dan
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Oct 10th 2013, 08:38 AM   #3

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 Originally Posted by phyoy Do not understand
There is far more mass on the right than on the left. D could not possibly be an answer.

-Dan
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 Oct 30th 2013, 03:54 PM #4 Senior Member     Join Date: Apr 2008 Location: Bedford, England Posts: 668 My answer would be C. A different term for centre of gravity is centre of mass, they are just different names for the same thing. Using this alternative name might make things a bit clearer. Adding extra mass below the original centre of mass must mean that the new centre of mass will be below the old centre of mass. This means that A and B are ruled out. Why not D is less obvious, The centre of mass of the disc must be within the disc. The addition of the disc cannot move the combined centre of gravity further than this point.

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