The discussion revolves around the dynamics of a falling and sliding stick, particularly focusing on the forces acting on the stick and the motion of its center of mass (CoM). Participants are exploring concepts related to translational and rotational motion, as well as the role of normal force (N) in the context of the stick's pivot on a frictionless rail.
The discussion is active, with various interpretations being explored regarding the motion of the stick and the forces acting on it. Some participants have offered insights into the necessity of considering both translational and rotational dynamics, while others are questioning the assumptions made about the pivot and the nature of the forces involved.
Participants are navigating the complexities of analyzing motion in a non-inertial frame and the implications of fictitious forces. There is a recognition that the pivot's acceleration affects the analysis, and some participants are considering the moment of inertia in relation to the stick's rotation.
If you lift a suitcase up by the handle, then the handle doesn't necessarily break off from the rest of the suitcase. And, if you hold a tennis racket by the handle, then the racket head (the bit with the strings) moves as well when you swing the handle.Father_Ing said:I am a bit confused..
If we see the the rod as a rigid body that is formed by many particles, N is exerted only to the particle at the end of the rod.In my opinion, N only affects the acceleration of the particle this point (the pivot, or we can also say, the end of the rod). However,in the equation ##N -mg = ma## , I can conclude that N affects the acceleration of the whole particles.
How can N affects the whole particles' acceleration?
Yep! I have made it through the 2nd question. I still have some problems regarding the concepts, though.PeroK said:Have you made any progress at solving this problem?
So, each particle has a force ##dN## exerted on it, and the value of ##dN## differs from each particle?haruspex said:Because the rod is rigid, so each particle transfers force and torque to the next.
Yes, each particle on the rod must be subject to the force required by the constraint that the rod remains rigid. ##N## is an external force applied at the pivot. ##dN## doesn't make sense in this context.Father_Ing said:So, each particle has a force ##dN## exerted on it, and the value of ##dN## differs from each particle?