- #1
Calculate how far the spring is stretched from its position?
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Homework Help Overview
The discussion revolves around a physics problem involving a block suspended from a spring on an incline, with specific parameters such as mass, spring constant, and angle provided. Participants are exploring the forces acting on the block and how to analyze the situation to determine the spring's stretch.
Discussion Character
- Exploratory, Conceptual clarification, Problem interpretation, Assumption checking
Approaches and Questions Raised
- Participants discuss the forces acting on the block, including gravity and the spring force. There are attempts to clarify the free-body diagram and the directions of the forces involved. Questions arise about the correct identification of forces and their interactions.
Discussion Status
The discussion is ongoing, with some participants providing guidance on refining the free-body diagram and questioning the understanding of force directions. There is a recognition of confusion regarding the number of forces and their correct representation, but no consensus has been reached on the solution.
Contextual Notes
Participants are working under the constraints of a homework assignment, which may limit the information they can share or the methods they can use. There is an emphasis on understanding the forces involved rather than simply calculating the answer.
- #2
Simon Bridge
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Welcome to PF;
good pic and question.
please show your best attempt.
good pic and question.
please show your best attempt.
- #3
- #4
andreyp27
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Also I know that F=mg so I get 35N=-45N/m(x)
- #5
Simon Bridge
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Start with a more careful free-body diagram for the block: what are the forces on it?
(hint: gravity, spring, and only one other...)
[edit: you appear to have Fk pointing directly upwards ... if this is the force from the spring you need to take another look at the diagram: which direction is the spring pulling on the block?
Don't know what Fp is supposed to be. Force of a "pull"? What is pulling on the black?]
(hint: gravity, spring, and only one other...)
[edit: you appear to have Fk pointing directly upwards ... if this is the force from the spring you need to take another look at the diagram: which direction is the spring pulling on the block?
Don't know what Fp is supposed to be. Force of a "pull"? What is pulling on the black?]
- #6
andreyp27
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Well there is force of gravity pushing down on the block and normal force pushing up than then the the force of the blocks mass is pulling the spring while the spring resists the pull...so that's what I have there in my free-body diagram
- #7
Simon Bridge
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You are very confused about forces.
You listed four and there are only three - so you have one too many.
"pushing up" is too vague: the direction of the normal force is "upwards perpendicular to the ramp".
the spring force points "up along the ramp".
"gravity" is what we call the pull that something has due to it's mass.
you don't need a separate force for it. It points directly down.
redraw your free body diagram to show the correct directions and forces.
You listed four and there are only three - so you have one too many.
"pushing up" is too vague: the direction of the normal force is "upwards perpendicular to the ramp".
the spring force points "up along the ramp".
"gravity" is what we call the pull that something has due to it's mass.
you don't need a separate force for it. It points directly down.
redraw your free body diagram to show the correct directions and forces.
- #8
- #9
Simon Bridge
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Which direction does the spring pull in?
Have you never pulled on a spring in your life?
This is a serious problem - do you not understand what a force is?
Have you never pulled on a spring in your life?
This is a serious problem - do you not understand what a force is?
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