Dynamics: Absolute and Relative Acceleration in Plane Motion

AI Thread Summary
The discussion revolves around a physics problem involving a rod on a horizontal table subjected to a force, with specified accelerations at points A and the need to determine the accelerations at points G and B. The user expresses confusion regarding the absence of a normal component of acceleration in the solution provided, noting that the solution only considers the tangential acceleration and angular acceleration without addressing the normal component. There is a consensus that the problem's evaluation focuses solely on the given accelerations, implying that no additional forces or components are necessary for the calculation. The user seeks clarification on why an acceleration in the normal direction is not accounted for in the context of the problem. The discussion highlights the complexities of analyzing motion in dynamics, particularly in relation to angular and linear accelerations.
Drew Davison
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Homework Statement


zPRsg3f.png


A force P is applied to the rod which rests on a horizontal table. The following accelerations are produced. aA= 3.6m/s2 to the right, α of the rod = 6 rad/s2 CCW. Determine the acceleration of point G and B

Homework Equations


aG=aA+aG/A
aG=aA+[(aG/A)tangential + (aG/Anormal)]
aG=aA+[(α X rG/A) + ( ω2 * rG/A)]

The Attempt at a Solution


So I tried to solve the problem and quickly found that there is no way to solve for angular acceleration (ω). Looking at the solution they completely leave out the normal component of acceleration to solve for the acceleration at G and A. They just plug in values for acceleration at A, angular acceleration and distance from A to G.

I can't figure out why there is no normal component of acceleration in this problem.
Any help?
Thanks!
 
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is there a force parallel to AG?
 
No only the forces that are show. The evaluation of the question only involves the accelerations
 
Drew Davison said:

Homework Statement


zPRsg3f.png


A force P is applied to the rod which rests on a horizontal table. The following accelerations are produced. aA= 3.6m/s2 to the right, α of the rod = 6 rad/s2 CCW. Determine the acceleration of point G and B

Homework Equations


aG=aA+aG/A
aG=aA+[(aG/A)tangential + (aG/Anormal)]
aG=aA+[(α X rG/A) + ( ω2 * rG/A)]

The Attempt at a Solution


So I tried to solve the problem and quickly found that there is no way to solve for angular acceleration (ω). Looking at the solution they completely leave out the normal component of acceleration to solve for the acceleration at G and A. They just plug in values for acceleration at A, angular acceleration and distance from A to G.

I can't figure out why there is no normal component of acceleration in this problem.
Any help?
Thanks!
Do you know how to work with the center of mass ?
 
Drew Davison said:
No only the forces that are show. The evaluation of the question only involves the accelerations
Then why should there be an acceleration in that direction?
 

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