Understanding Why Force Along X-Axis is Different

[werson tan]

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

 

[Suraj M]

Since what are in the same direction?

 

[werson tan]

Since what are in the same direction?

as wecan see , they are moving to the right

 

[Suraj M]

There are 3 there
Please specify what you mean by “they”

 

[werson tan]

as wecan see , they are moving to the right

velocity along the x direction . (circled part)

 

[Suraj M]

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?

 

[werson tan]

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

 

[Suraj M]

Then yes the pseudo force(cos component) and the inlet would add up

 

[werson tan]

Then yes the pseudo force(cos component) and the inlet would add up

so , the notes is wrong ? the velocity should add up ?

 

[Suraj M]

I'm trying to get my head around the fact that they've taken force due to the inlet twice.

 

[werson tan]

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

 

[Suraj M]

I'm not an expert in this but I do agree with you.