Why Can't I Resolve Forces Upward?

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Homework Help Overview

The discussion revolves around the resolution of forces in a physics problem, specifically questioning why forces cannot be resolved in the upward direction as indicated in a diagram. The original poster expresses confusion regarding the direction of the y-component forces, which the textbook states are downward.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the implications of force equilibrium in a stationary situation, questioning how upward forces could lead to non-zero net forces. Some participants suggest that a free body diagram (FBD) should clarify the absence of upward forces, while others express uncertainty about their own FBDs and the correctness of their interpretations.

Discussion Status

The discussion is ongoing, with participants offering insights into the nature of forces and free body diagrams. There is a mix of interpretations regarding the direction of forces, and some participants are seeking clarification on their diagrams without reaching a consensus.

Contextual Notes

There is mention of a specific force value (600N) and friction, which may be relevant to the problem context but is not fully explored. The original poster's confusion about the textbook's explanation and their own diagram indicates a potential gap in understanding the setup of the problem.

goldfish9776
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Homework Statement


why can't I resolve the forces in upward direction ? ( as in the sketched diagram)
the book showed that the (y component ) forces are in downward direction ... why can't be in upward direction ?

Homework Equations

The Attempt at a Solution

 

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If you think a situation where the car is not moving. Then all the forces must sum up to zero. If you would take y component forces upward then you would have sum of forces that is not zero. There should be acceleration and after infinity of time cars speed would be infinity?
Downward force should be same as upward force until the (600N) is bigger than friction.
 
goldfish9776 said:

Homework Statement


why can't I resolve the forces in upward direction ? ( as in the sketched diagram)
Why do you want to do this? o_O

the book showed that the (y component ) forces are in downward direction ... why can't be in upward direction ?

If you draw a free body diagram of the tow ropes, it should become fairly obvious that there are no forces in the upward (sic) direction.

After all, you can't push on a rope. :wink:
 
SteamKing said:
Why do you want to do this? o_O
If you draw a free body diagram of the tow ropes, it should become fairly obvious that there are no forces in the upward (sic) direction.

After all, you can't push on a rope. :wink:
I drew a free body diagram( pencil -sketched ) , but i gt the forces are in upwards direction . Lol
 
goldfish9776 said:
I drew a free body diagram( pencil -sketched ) , but i gt the forces are in upwards direction . Lol
The you drew the FBD wrong.
 
SteamKing said:
The you drew the FBD wrong.
Which part is wrong?i couldn't figure it out
 

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