FBD and what forces should I include?

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Homework Help Overview

The discussion revolves around identifying the forces to include in a free body diagram (FBD) for a scenario involving a metal rod with a string attached to a mass, which is spun around the rod. The context is related to dynamics and forces acting on objects in circular motion.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants are attempting to identify the relevant forces acting on the mass, including gravity, centripetal force, and tension. Questions are raised about the role of gravity and whether a normal force is present. Some participants express the need for a visual representation to clarify the situation.

Discussion Status

The discussion is active, with participants exploring various forces that should be included in the FBD. There is a focus on understanding the interactions between these forces, and some guidance has been offered regarding the types of forces to consider. However, there is no explicit consensus on the complete set of forces or their interactions.

Contextual Notes

Participants note the difficulty in predicting the forces without a drawing, indicating that visual aids may be necessary for clearer understanding. The original poster's request for help suggests constraints related to homework guidelines on drawing FBDs.

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In the following situation, how should I draw a FBD and what forces should I include? A metal rod has a string coming out of one end. The other end of the string is attached to a small mass. The metal rod undergoes spinning action by the hand so that the string with the mass attached spins around the metal rod and is parallel to the ground. The metal rod is held in the hand perpendicular to the ground.
 
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Could you provide a drawing please...?And what is the problem asking...?

Does gravity play a role...?

Daniel.
 
Basically the situation is, you are flinging a string with a mass at one end over your head. The strings flies around in circles kind of like a helicopter. My question is, what forces should I include in the FBD. I know there is centripetal force. There should be gravity pulling down, but what counteracts this force (a normal force?)
 
Last edited:
Elastic force,centripetal force,gravity force,and tension in the rod...What other forces would be there...?

Daniel.
 
I’m just looking for forces acting on the mass at the end of the string
 
Elastic,gravity and centripetal.But it's difficult to predict which acts how,if you don't provide a drawing ...

Daniel.
 
thanks, i'll try to get a drawing
 

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