Oh, aG is the acceleration of the center of mass.
And yes I understand how to calculate moments and torque, it's just summing the moments about a point other than the center of mass or the rotational axis when considering an accelerating rigid body that I am confused about.
Why are kinetic moments not included in the regular summation of the moments? In other words why is the equation ∑M = ∑Mk and not ∑M + ∑Mk = 0 ?
I guess it would help if someone could explain exactly what a kinetic moment is, and why it is equal to the summation of the moments due to external...
So you're saying the book made a mistake? This whole chapter is about how when a rigid body is accelerating, you have to account for the kinetic moments which are the moments of maG about whatever point you're summing the moments about + Iα
Here is the diagram containing the kinetic forces that...
In the example they never summed the moments of the applied forces about the centers of mass though? The values they use for the kinetic moments are m1aG1rB and m2aG2rB
Take a look at this example.
http://imgur.com/a/Gfxq5
and the solution
http://imgur.com/a/8B7Rq
And are you sure about being able to apply the parallel axis theorem to that equation? You would get ∑Mp = (I + md2)α; that just doesn't seem right to me.
Edit: Oh and I just realized that Iα is...
This is only true if the net torque is calculated about the center of mass on a rigid body. If you are calculating the moment of an accelerating rigid body about a point other than the center of mass, you have to include the moment that maG (where G is the center of mass) makes about that...
Why don't we include the kinetic moments in the summation of the moments of a rigid body? In other words, why are the kinetic moments on the opposite side of the equation as the moments due to external forces? I understand that the math works out but it's not making sense to me conceptually...
I just found that applying an axial load of magnitude σ on both sides of a ductile rod will produce a max in plane shear stress of magnitude σ/2. Why is this? How can there be shear stress if only a normal force is applied?
How about for this problem?
Cartons having a mass of 5kg are required to move along the assembly line at a constant speed of 8 m/s. Determine the smallest radius of curvature for the conveyor so the cartons do not slop. The coefficients of static and kinetic friction between a carton and the...
For a particle undergoing a constant velocity circular motion. I thought friction always acted in the direction of motion which would be in the tangential direction.
Hey thanks for the reply, it's good to hear from someone that majored in EP. Did you end up going to grad school for physics? Was it easy to get into a physics grad program?
And I posted a picture of the curriculum, could you tell me what you think of it?
I'm not sure if I want to go to grad school for physics or get an engineering job, so I'm wondering if this degree will allow me to do both, so I can pick later on down the road.
I have been stuck between physics and engineering for a while. Someone recommended that I major in engineering physics, as the school I want to transfer to has like the 4th best EP program in the US. I pretty much take all of the physics classes physics majors need (except for labs and...