Centre of Gravity: Balance Point

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Originally Posted by slug_burner

I think you know the answer, static. Global movement will not change the CoG, you have to have relative movement of weighty parts to get any change. How do you get the CoG to move forward? I can picture minor vertical movement of the CoG as a result of the suspension allowing the axle assemblies to move relative to the chassis/body but having difficulty picturing fore and aft movement of the CoG solely due to suspension movement.

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OK... Under heavy acceleration, the weight is shifted rearwards and under heavy breaking, it is shifted forwards.

Is that affecting the CoG or is that something else???

M

is it changing because of the weight shift....or because the front squats down and the rear lifts under braking, vise versa for accelleration. thus changing the heights in relation to the ground etc :confused:

still having no joy with the link on page 1....yes I tried what John suggested.

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Originally Posted by uninformed

snip ..
still having no joy with the link on page 1....yes I tried what John suggested.

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pm me your email address and I will send you the pdf file.

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Originally Posted by camel_landy

OK... Under heavy acceleration, the weight is shifted rearwards and under heavy breaking, it is shifted forwards.

Is that affecting the CoG or is that something else???

M

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I'm affraid not. I only quickly scanned what slug_burner wrote, but it seemed valid.

When you calculate the the normal reactions between road and tyres at the front and rear wheels the inertial forces resulting from acceleration increase the reaction at one end and reduce the reaction by the same amount at the other. Increasing the height of the COG increases the change in the reactions i.e. change = mass x accel x height of COG / wheelbase

However there is no change to the postion of the COG (assuming no loose mass was displaced).

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Originally Posted by Bush65

I'm affraid not. I only quickly scanned what slug_burner wrote, but it seemed valid.

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OK. So CoG stays put but it's essentially subtle differences between gravity, momentum, inertia, etc..

Every day is a school day. :D

M

Everything you need to know about CofG is here

Center of Gravity and Roll-Over Angle - Jeepaholics Anonymous


this bloke did not read the article
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Adding insult to injury by taking out the back panels of the green-ish car...:o