Lifting a crate magnitude of forces.

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Homework Help Overview

The discussion revolves around the forces acting on a crate that a woman is attempting to lift unsuccessfully. The forces are defined as the upward force exerted by the woman (P), the contact force from the floor (C), and the weight of the crate (W). Participants are exploring how these forces relate to each other under the condition of the woman not being able to lift the crate.

Discussion Character

  • Conceptual clarification, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants are questioning the relationships between the forces, specifically considering the implications of the equations P+C>W, P=C, and P+C=W. There is discussion about why certain equations may or may not be valid based on the scenario described.

Discussion Status

The discussion is active, with participants providing reasoning for their interpretations of the force relationships. Some participants are suggesting that if P+C=W, the crate would remain still, while others are debating the validity of flipping the inequality in the first equation. There is no explicit consensus on the correct relationship at this point.

Contextual Notes

Participants are working within the constraints of the problem statement, which lacks specific equations or additional context. There is an emphasis on understanding the relationships between the forces rather than deriving a solution.

physicsgurl12
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Homework Statement



a woman is straining to lift a large crate with no sucess. its too heavy. we denote the forces on the crate as follows: P is the upward force on the crate by the person. C is the contact force on the crate by the floor and w is the weight. how are the magnitudes related while the person is unsucessfully trying to lift the crate.
P+C>W
P=C
P+C=W

Homework Equations



none??

The Attempt at a Solution


im guessing its not the second one because weight isn't even in that equation
 
Last edited:
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The problem statement appears to be garbled.

What is the problem supposed to say?
 
i fixed it.
 
physicsgurl12 said:

Homework Statement



a woman is straining to lift a large crate with no success. its too heavy. we denote the forces on the crate as follows: P is the upward force on the crate by the person. C is the contact force on the crate by the floor and w is the weight. how are the magnitudes related while the person is unsuccessfully trying to lift the crate.
P+C>W
P=C
P+C=W

Homework Equations



none??

The Attempt at a Solution


im guessing its not the second one because weight isn't even in that equation

I'm guessing that to be successful in your physics course you will need to do more than guess.

Why or why not: P+C>W ?

Why or why not: P=C ?

Why or why not: P+C=W ?
 
haha. well not the first one because the force of the woman pulling up plus the floor pushing up can't be greater than the weight or she could lift it.
not the second one because the forces go in the same direction
 
Actually it could be that P = C.

Why or why not: P+C=W ?
 
um i guess if P+C=W the crate would be still. Because the forces equal the weight? so it could be this one
 
physicsgurl12 said:
um i guess if P+C=W the crate would be still. Because the forces equal the weight? so it could be this one
It could be this one, but likely it's like the first one, but with the > flipped to < .
 
its not. that's what i had the first time and it was wrong. You can't flip it.
 
  • #10
I can. Probably you can't.
 
  • #11
haha
 

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