Does 2 spring @ 30 degrees = 1 @ 90?

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Discussion Overview

The discussion revolves around the effective spring constant of a system of two identical springs attached at a 30-degree angle to the ceiling, compared to a single spring oriented vertically. Participants explore the implications of this configuration on the spring constant and the behavior of the system under different conditions.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests that the effective spring constant of the system can be considered equal to that of one spring due to the geometry of the setup, specifically referencing the relationship 2*sin(30) = 1.
  • Another participant questions the validity of this assumption, noting that the angle will change as the system moves, which may affect the effective spring constant.
  • A third participant agrees with the initial claim but specifies that this holds true only for the vertical spring constant in a small neighborhood around the equilibrium position, while acknowledging that horizontal behavior differs.
  • A repeated assertion of the initial scenario emphasizes the need to apply the correct formula for effective spring constants in parallel configurations, contrasting it with series connections, which is likened to electrical resistors.

Areas of Agreement / Disagreement

Participants express differing views on the validity of the effective spring constant being equal to that of one spring. While some support the idea under specific conditions, others raise concerns about the changing dynamics of the system, indicating that the discussion remains unresolved.

Contextual Notes

There are limitations regarding the assumptions made about the angle remaining constant and the conditions under which the effective spring constant is evaluated. The discussion also highlights the distinction between vertical and horizontal components of the spring system.

alaix
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Let's say you have 2 identical springs

Let's say length = 1m
Spring constant = 0.5

You attach each spring to the ceiling and a mass. The springs make a 30 degree angle with the ceiling. Basically the system forms a triangle...

Is it OK to say that the effective spring constant of the system is equal to the spring constant of one spring, since 2*sin(30) = 1?
 
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effective constant,,,for how long? I mean, as soon as you move a bit, that 30 degree angle is not going to be there...

...the truth is that I have not look into it, just yet, I figure I shoot you back a quick reply to make you think about your own statement, for now.
 
Yes, I think this is correct... for the vertical spring constant, in a small neighbourhood around the equilibrium.

Horizontally it is different, and it will change as the end moves, as gsal mentioned.
 
alaix said:
Let's say you have 2 identical springs

Let's say length = 1m
Spring constant = 0.5

You attach each spring to the ceiling and a mass. The springs make a 30 degree angle with the ceiling. Basically the system forms a triangle...

Is it OK to say that the effective spring constant of the system is equal to the spring constant of one spring, since 2*sin(30) = 1?

for two springs connected in a series, the effective spring constant K is given by-
1/K=1/k1+1/k2.
in parallel -
K=k1+k2.
this is a question of parallel connection so accordingly use the right expression.
(note this is righty the opposite to series and parallel connections of resistors as in electricity)
 

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