- #1
Chaso
- 23
- 0
Hi I need some help explaining kinetic moment and moment of the center of mass.
This is an example:
http://session.masteringengineering.com/problemAsset/1529176/3/Hibbler.ch17.p107.jpg
Okay I know that when you do moment equations:
The Moment forces about some point is = to the kinetic moment about that point so for same.
M_g = KM_g (kinetic moment)
So if we do this for point C (where the wheel touches the ground)
Its M_C = Ig (moment of inertia about g, center of mass)*(angular acceleration) + kinetic moment about C which would be due to the acceleration of G.
But when you do that for for the Point G the Moment about G is always equal to the the Ig*a.
So my question is way is the moment about the center of mass always equal to the Ig*a when there's an acceleration at point c. wouldn't that affect the moment about G?
This is an example:
http://session.masteringengineering.com/problemAsset/1529176/3/Hibbler.ch17.p107.jpg
Okay I know that when you do moment equations:
The Moment forces about some point is = to the kinetic moment about that point so for same.
M_g = KM_g (kinetic moment)
So if we do this for point C (where the wheel touches the ground)
Its M_C = Ig (moment of inertia about g, center of mass)*(angular acceleration) + kinetic moment about C which would be due to the acceleration of G.
But when you do that for for the Point G the Moment about G is always equal to the the Ig*a.
So my question is way is the moment about the center of mass always equal to the Ig*a when there's an acceleration at point c. wouldn't that affect the moment about G?