Understanding Why Force Along X-Axis is Different

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Homework Help Overview

The discussion revolves around understanding the calculation of force along the x-axis in a physics context, specifically addressing the relationship between velocity and force components. Participants are examining why a particular expression for force is structured in a specific way.

Discussion Character

  • Conceptual clarification, Assumption checking, Mixed

Approaches and Questions Raised

  • Participants are questioning the directionality of forces and velocities, particularly why certain components are added or subtracted. There is a focus on clarifying which forces are being referenced and how they relate to the overall force calculation.

Discussion Status

The discussion is active, with participants seeking to clarify the relationships between different forces and their components. Some guidance has been offered regarding the addition of forces, but there is no explicit consensus on the correct approach yet.

Contextual Notes

There appears to be confusion regarding the forces involved, specifically the inflow and outflow forces, and how they contribute to the resultant force along the x-axis. Participants are also questioning the validity of notes related to the problem.

werson tan
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Homework Statement


why for the force along the x -axis , the velocity is 12 cos 60 -12 ? why not 12cos60 12 , since they are in the same direction

Homework Equations

The Attempt at a Solution

 

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Since what are in the same direction?
 
Suraj M said:
Since what are in the same direction?
as wecan see , they are moving to the right
 
There are 3 there
Please specify what you mean by “they”
 
werson tan said:
as wecan see , they are moving to the right
velocity along the x direction . (circled part)
 
That's not what I meant
I meant which force the one due to outflow through A or B or the inflow. Of the 3 which 2 are you referring to?
 
Suraj M said:
That's not what I meant
I meant which force the one due to outflow through A or B or the inflow. Of the 3 which 2 are you referring to?
I want to ask A and the inlet first
 
Then yes the pseudo force(cos component) and the inlet would add up
 
Suraj M said:
Then yes the pseudo force(cos component) and the inlet would add up
so , the notes is wrong ? the velocity should add up ?
 
  • #10
I'm trying to get my head around the fact that they've taken force due to the inlet twice.
 
  • #11
Suraj M said:
I'm trying to get my head around the fact that they've taken force due to the inlet twice.
what do yo you mean ? we want to find the resultant force , right ? So , the correct approach would be 12cos60 + 12 , right ? since they are both directed to the right
 
  • #12
I'm not an expert in this but I do agree with you.
 

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