How Do You Calculate Normal Force for a Cup and Saucer on a Table?

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Homework Help Overview

The discussion revolves around calculating the normal force exerted by a saucer on a cup and by a table on the saucer, involving concepts from mechanics related to forces and mass. The participants are exploring the application of Newton's laws in this context.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • The original poster attempts to use the equation ΣF = m*a but expresses uncertainty about its application. Some participants suggest starting with a free body diagram and relate the normal force to the gravitational force, while others question how to approach the second part of the problem regarding the normal force from the table.

Discussion Status

The discussion includes attempts to clarify the relationship between forces acting on the cup and saucer. While some participants have made progress on part a, there is still uncertainty regarding part b, although one participant indicates they have resolved their confusion.

Contextual Notes

The original poster mentions a lack of familiarity with the relevant equations and concepts, which may impact their understanding of the problem. There is also a reference to the forces involved, specifically the gravitational force, which is central to the discussion.

Snape1830
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1. A cup and saucer rest on a table top. The cup has mass of 0.176 kg and the saucer 0.165 kg. Calculate the magnitude of the normal force a). the saucer exerts on the cup and b). the table exerts on the saucer.



Too be honest I really don't know the equation. I think it might be ΣF=m*a but I'm not sure. And if that is the formula, I do not know how to proceed.
 
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Start with a free body diagram. The saucer and cup are not moving upwards or downwards, so Fn=Fg.
 
I still don't understand how to find part b. Part a was 1.7 N ([itex]\SigmaF=0.176(9.8)[/itex]
So I got part a down, but I can't figure out how to do part b. I tried finding the force due to gravity, and then did Normal force-force due to gravity = ma. That didn't work.
 
Never mind, I figured it out!
 

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