A Marble Rolls Around a Circular Cone - Diagram

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Homework Help Overview

The discussion revolves around a physics problem involving a marble rolling around a circular cone, focusing on forces acting on the marble and its acceleration. Participants are analyzing a free body diagram (FBD) and the relationships between normal force and gravitational force in the context of circular motion.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants discuss the direction of the normal force and acceleration, with one participant attempting to identify the correct representation of these forces from a diagram. Questions arise about the correct choices for acceleration and normal force from given options.

Discussion Status

The discussion is ongoing, with participants providing insights into the direction of acceleration and the need to consider both direction and magnitude of forces. Some guidance has been offered regarding the use of Fnet = ma, and there is recognition of the need to analyze y-components for a more accurate understanding.

Contextual Notes

Participants note that the problem requires selecting answers from specific choices (A-X) for both normal force and acceleration, which adds complexity to the analysis. There is an acknowledgment of previous incorrect attempts and the need for clarification on the correct approach.

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Homework Statement



http://gyazo.com/fa8026ffdf2ccb97d0b09b9e74460455

Homework Equations



Fnet=mg

The Attempt at a Solution



I said that the letter B was the normal force which I derived from just drawing an FBD of the ball on the left side of the code

For acceleration I used Fnet=mg so the Fnet was gravity, so from there I said that the letter representing normal force was pointing in the same way of fnet, being letter E..

It was wrong. Please help
 
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OK for the normal force direction.

For the direction of the acceleration, you should be able to see what it is without worrying about the forces. Use what you know about the acceleration of a particle moving in a circle with constant speed.

[Although you don't need it for this question, the correct formula is Fnet = ma, not Fnet = mg. The acceleration of the particle is not g for this problem. Fnet is the vector sum of all of the forces acting on the particle.]
 
So my answer would be that the acceleration is pointing towards the center of the circle. But that could be C, K, or S. How would I answer this? It has to be one of those but I don't know which.
 
The question says to pick answers for the acceleration from the choices Q through X.
 
I just attempted BS and was incorrect
 
Ah. I see an extra thing you have to consider. Sorry, I didn't see that before. Note that the question asks for you to pick the normal force from the choices A-X. Now B, J and R all have the same direction. But they have different magnitudes. So, you will now have to decide which of those has the correct magnitude. For this you will need to use Fnet = ma.

[HINT: Consider the y-components: ƩFy = may ]
 
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