- #1
Hyperfluxe
- 35
- 0
Homework Statement
Homework Equations
See my work.
Static friction problem for person to walk up plank
- Thread starter Hyperfluxe
- Start date
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Homework Help Overview
The discussion revolves around a static friction problem involving a person walking up a plank, likely incorporating concepts of forces, angles, and trigonometric functions.
Discussion Character
- Mixed
Approaches and Questions Raised
- Participants explore the correct application of trigonometric functions to forces acting on the system, questioning whether to use sine or cosine based on the orientation of the forces. There are attempts to clarify the relationships between weights and angles, as well as discussions on the accuracy of visual representations of the problem.
Discussion Status
Participants are actively engaging with each other's reasoning, pointing out potential errors in the application of equations and functions. Some guidance has been offered regarding the correct equations to use, and there is a recognition of mistakes made in calculations, though no consensus on the final solution has been reached.
Contextual Notes
There are indications of difficulties in visualizing the problem due to the quality of images shared, which may be affecting the clarity of the discussion.
See my work.
- #2
Xisune
- 54
- 0
You used the wrong trig function, you multiply all forces by sin40 except for friction going up, that's when you use cos40 .
- #3
Hyperfluxe
- 35
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Shouldn't the weights be multiplied by cos(40) because they are vertically downwards, so the moment arm would be the horizontal distance?
- #4
Xisune
- 54
- 0
Hyperfluxe said:
You're right, my mistake.
The answer I get still doesn't match yours, but I can barely see the text, do you have a clearer picture of the solution?
- #5
Hyperfluxe
- 35
- 0
Yeah my bad, the quality is horrendous. Here's a way better one:
- #6
Xisune
- 54
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You used the wrong equation during the final step. Set 165.22s + 70.81 equal to equation 2. That should get you the correct answer.
- #7
Hyperfluxe
- 35
- 0
Wow that was such a silly mistake haha. Thanks for pointing it out! I got 1.00m as the answer.