Rotating mass system with a forward velocity and acceleration

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SUMMARY

The discussion focuses on a solid rotating body with a moment of inertia I, which maintains a constant angular velocity w while moving in a straight line at velocity v. When the system undergoes an acceleration a, the objective is to derive the equation for the force vector F acting on the axis of rotation. The problem involves the Coriolis effect, akin to the behavior of a spinning gyroscope when subjected to lateral forces. Key equations include the torque vector N, defined as N = r x F, and the application of Newton's laws to account for inertial forces in a moving reference frame.

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  • Understanding of rotational dynamics and moment of inertia
  • Familiarity with angular velocity and linear acceleration concepts
  • Knowledge of the Coriolis effect in rotating systems
  • Proficiency in applying Newton's laws in non-inertial reference frames
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Homework Statement


I have a

solid rotating body with moment of inertia I rotating at a constant angular velocity w

body is spinning about an ideal bearing located at its CG, the system is also moving in straight line at a velocity v when it suddenly undergoes an acceleration a. I want to find an equation for the Force vector F placed on the axis of rotation by the accelerating rotating mass.
** angular velocity remains the same **

This problem has something to do with the coriolis effect and is similar to taking a spinning gyroscope and pushing it strongly in one direction. It puts a side force on your hand

Homework Equations



Not sure where to start. I have the angular velocity equations as well as the forward velocity and acceleration equations of . A good start would be helpfull please!


The Attempt at a Solution


 
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Consider the pivot point of the rotating body. The torque vector, N, is related to the applied force by N = r x F where r is the distance from the pivot point to the center of mass of the system. Also, the acceleration is linear so Newton's laws become F - ma = m times the second time derivative of the postion vector relative to the moving reference frame, and a is the acceleration of the system. The ma term is an inertial force and not a real force and depends on the acceleration of the moving coordinate system. F = mg in this case and points vertically downward, and ma points in a horizontal direction. The effective force acting on the pivot point is the vector addition of these two components.
 

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