How do I draw a free-body diagram for an object sliding down an inclined plane?

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Discussion Overview

The discussion revolves around how to draw a free-body diagram (FBD) for an object sliding down an inclined plane. Participants explore the components of the FBD, the forces involved, and the relationship between the ramp's angle and the normal force.

Discussion Character

  • Homework-related
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant requests detailed guidance on drawing an FBD for an object on a ramp, indicating a lack of understanding of the concept.
  • Another participant questions the vagueness of the initial inquiry and suggests that difficulties may stem from mathematical aspects rather than physics.
  • A participant expresses confusion regarding the relationship between the angle of inclination of the ramp and the normal force, questioning why they are considered equal.
  • There is a discussion about the essential forces to include in an FBD and the minimum annotations required for clarity.
  • Some participants share links to external resources that may help clarify the concepts related to FBDs and inclined planes.
  • A later reply indicates that one participant found a resource helpful and believes their problem is resolved.

Areas of Agreement / Disagreement

The discussion shows a lack of consensus on the understanding of free-body diagrams, particularly regarding the forces involved and their relationships. Some participants express confusion, while others provide resources and suggestions without reaching a definitive resolution.

Contextual Notes

Participants have not fully articulated their assumptions or the specific mathematical steps they find challenging. The discussion remains focused on conceptual understanding rather than providing a complete solution.

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Misr said:
Hello there ,
I don't know how to draw free body diagrams ,
so can u illustrate to me how to draw an FBD for an object sliding down a ramp like this one.
http://ffden-2.phys.uaf.edu/211_fall2004.web.dir/Jeff_Levison/freebody_diagram.jpg
illustrate this in details , please

Thanks

This is a rather vague question. What exactly don't you know? The figure already shows you, in detail, what the FBD should look like. So where are you having a problem? When I had students who asked me a question like this, I often find that they're having problems with the mathematics, i.e. trig and geometry, and not the physics.

This is a standard school work. Start with the simpler form, such as a mass on a horizontal surface. Can you draw the FBD for that? In other words, show us what you already know, and we can work from there. It is the only way to figure out the source of your problem.

Zz.
 
such as a mass on a horizontal surface. Can you draw the FBD for that?
Yes i can

I'm havin a prob with the imaginary line down the ramp , which is equilibruim with the normal force
I don't know why do we suppose so.
I don't know why should the angle of inclination of the ramp should equal the angle of inclination of the normal force

I think these are my problems
 
When you draw free-body diagrams, what are the forces you include and don't include? What is the minimum annotation a free-body diagram must have?
 
I don't know
 
Read these:
http://www.physicsclassroom.com/Class/newtlaws/u2l2c.cfm"
http://www.physicsclassroom.com/Class/vectors/u3l3e.cfm"
 
Last edited by a moderator:
Read these:
Drawing Free-Body Diagrams
Inclined Planes
This website is magnificent
Thanks , my problem is solved now .
 

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