Why Can't I Resolve Forces Upward?

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AI Thread Summary
The discussion centers on the inability to resolve forces in the upward direction in a given scenario involving a car and tow ropes. Participants emphasize that for a stationary object, all forces must sum to zero, indicating that downward forces must equal upward forces. A free body diagram (FBD) is suggested as a tool to visualize the forces, revealing that there are no upward forces acting on the system. Misinterpretations of the FBD are noted, with one participant admitting to incorrectly sketching the forces. Ultimately, understanding the correct application of force resolution is crucial for solving the problem.
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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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