Why Can't a Conical Pendulum's String Be Horizontal?

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Homework Help Overview

The discussion revolves around the mechanics of a conical pendulum and the conditions under which the string can or cannot be horizontal while the mass moves in a circular path. Participants are exploring the forces acting on the system, particularly focusing on tension and centripetal force.

Discussion Character

  • Conceptual clarification, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants are questioning why the string cannot be horizontal in a conical pendulum setup and are considering the implications of setting the angle θ to 90 degrees. There are inquiries about the forces acting on the mass and the nature of centripetal force in circular motion.

Discussion Status

The discussion is active, with participants providing insights into the forces involved and questioning the implications of different configurations. Some have suggested examining the vertical forces and the resultant force direction, indicating a productive exploration of the topic.

Contextual Notes

There is an emphasis on understanding the relationship between tension, weight, and the geometry of the pendulum's motion. Participants are also considering the implications of specific assumptions, such as the angle of the string.

Hugofung
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Such as the figure
c47166411v146.png


Why the string could not be horizontal when the rubber bungis moving in a horizontal circle?
Only moving at conical pendulum?

By the way, if tension is equal to weight(W), have any conclusion?
 
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Why the string could not be horizontal when the rubber bungis moving in a horizontal circle?

Write an equation for the vertical forces acting on the bung. Set θ = 90 and see what happens.
 
What do you know about the force that is required to make an object move in a circle?
 
andrevdh said:
What do you know about the force that is required to make an object move in a circle?
centripetal force
 
Correct. That is the resultant force on the object needs to point to the centre of the circle.
In this case it means that the resultant of the two vectors must point to the center of
the circle. If the string could be horizontal where would the resultant lie?
 

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