Physics Help Forum Gravitational field (variation of g with latitude)

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 Aug 8th 2017, 08:55 AM #1 Junior Member   Join Date: Jul 2017 Posts: 4 Gravitational field (variation of g with latitude) Anyone know why should the mg' does not directed downward straight(90°) but slanted to the left side which merely same with mg? Sent from my Lenovo A5000 using Tapatalk
 Aug 8th 2017, 09:59 AM #2 Senior Member   Join Date: Apr 2015 Location: Somerset, England Posts: 688 Your diagram, although grossly oversize, clearly shows that a body on the surface of the Earth experiences two forces. 1) An attraction due to gravity directed towards the centre of the Earth 2) A centripetal force due to rotation directed towards the north south axis of rotation. On a sphere the first force is the same everywhere, but the second force varies with distance from the axis of rotation (ie latitude). It is zero at the poles and maximum on the equator. The total forces is the vector sum of these two. goldsomecriss likes this.
Aug 8th 2017, 04:17 PM   #3
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Join Date: Jul 2017
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 Originally Posted by studiot Your diagram, although grossly oversize, clearly shows that a body on the surface of the Earth experiences two forces. 1) An attraction due to gravity directed towards the centre of the Earth 2) A centripetal force due to rotation directed towards the north south axis of rotation. On a sphere the first force is the same everywhere, but the second force varies with distance from the axis of rotation (ie latitude). It is zero at the poles and maximum on the equator. The total forces is the vector sum of these two.
get it, thanks a lot!

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 Tags field, gravitational, latitude, variation