How Do You Calculate Resultant and Difference of Forces?

  • Context: High School 
  • Thread starter Thread starter Miraj Kayastha
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Discussion Overview

The discussion revolves around the calculation of the resultant and difference of forces, specifically focusing on the forces -4 and -8 Newton. Participants explore the methods for calculating these values and the implications of the terms used.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant calculates the resultant of -4 and -8 Newton as -12 N and the difference as +4 N, questioning the correctness of these methods.
  • Another participant agrees that both methods are correct.
  • A third participant reiterates the calculations and prompts further exploration of the physical meaning of the 'difference' in forces.
  • One participant questions whether the difference in force should be calculated as (-4) - (-8) or as (+8) - (+4), suggesting a need for clarity on the expressions used.
  • A subsequent reply states that the expressions are equivalent and provides a brief explanation of the mathematical relationships involved.
  • Another participant asks for clarification on the term "Difference of forces," indicating a desire for deeper understanding.

Areas of Agreement / Disagreement

While some participants agree on the correctness of the calculations, there is a lack of consensus regarding the interpretation of the 'difference' in forces, leading to further questions and exploration.

Contextual Notes

Participants express uncertainty about the physical meaning of the 'difference' in forces and the equivalence of different mathematical expressions, indicating potential limitations in understanding the concepts involved.

Miraj Kayastha
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There are forces -4 and -8 Newton.
If we need to find the resultant of the force we do : (-4) + (-8) = -12 N
If we need to find the difference in force we do : (-4) - (-8) = +4N

Are the two methods correct?
 
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Yes,the tow methods are correct.
 
Miraj Kayastha said:
There are forces -4 and -8 Newton.
If we need to find the resultant of the force we do : (-4) + (-8) = -12 N
If we need to find the difference in force we do : (-4) - (-8) = +4N

Are the two methods correct?

Yes
The resultant force has a physical meaning that is easy to grasp but what do you think the 'difference' represents? It's worth while exploring around things like this if you want to improve your understanding.
 
Is the difference in force : (-4) - (-8) or (+8) - (+4)?
 
Miraj Kayastha said:
Is the difference in force : (-4) - (-8) or (+8) - (+4)?
Those expression are equivalent.

A + (-B) = A - B

-A - (-B) = -A + B = B - A, etc.
 
Miraj Kayastha,
What do you understand by the term Difference of forces?
 

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