Addition of Perpendicular Vectors in two ways

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Discussion Overview

The discussion revolves around the addition of perpendicular vectors, specifically focusing on a force vector of 100N at a 45-degree angle to the x-axis. Participants explore the calculation of vector components and the verification of results using different methods, including trigonometric decomposition and the head-to-tail method.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant calculates the components of a 100N force vector at 45 degrees, obtaining 70N for both the x and y components using trigonometric functions.
  • Another participant points out that simply adding the components arithmetically does not account for their directional nature, suggesting the need to consider the hypotenuse of the right triangle formed by the components.
  • A third participant confirms that the hypotenuse of the triangle is indeed 100N, indicating that the components should combine to recreate the original force vector.
  • One participant suggests that the misunderstanding lies in not correctly reconstituting the original force vector from its components.
  • A later reply indicates a willingness to rephrase the initial question for further clarification.

Areas of Agreement / Disagreement

Participants express differing views on the correct approach to adding the vector components, with some emphasizing the importance of vector direction while others focus on the numerical values. The discussion remains unresolved as participants have not reached a consensus on the initial misunderstanding.

Contextual Notes

There are limitations in the discussion regarding the assumptions made about vector addition and the interpretation of the head-to-tail method. The participants have not fully explored the implications of vector directionality in their calculations.

Raabi Anony
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I have a Force Vector = 100N, making an Angle = 45 degrees with x-axis.
When I find their Components trigonometrically, I get 70N each; as
Fx = 100xCos(45) = 70N
Fy = 100xSin(45) = 70N

Verifying the result, by Head-to-Tail method, I get 70N + 70N = 140N.

Why is there discrepancy or where am I making a mistake?
Please help.
 
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Raabi Anony said:
Verifying the result, by Head-to-Tail method, I get 70N + 70N = 140N.
You are just adding them together arithmetically. Aren't they vectors in different directions (90 degrees)? What's the hypotenuse of that right angled triangle?
 
The hypotenuse of that right angled triangle is 100N.
 
Raabi Anony said:
The hypotenuse of that right angled triangle is 100N.
So the two components add together to produce the original force. The other two components will cancel because they are at 90 degrees to the original force. Your mistake was in not reconstituting the original force correctly.
Is there still a problem? I think we've solved your query.
 
Thanks for your time. Let me re-phrase my question and come back.
 

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