What is the Upward Force of Water on a Sinking Stone?

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Homework Help Overview

The discussion centers around calculating the upward force exerted by water on a sinking stone, given its mass and acceleration. The subject area involves concepts from dynamics and fluid mechanics.

Discussion Character

  • Exploratory, Mathematical reasoning

Approaches and Questions Raised

  • Participants explore the relationship between the upward force and the weight of the stone, discussing the net force acting on the stone as it sinks. There are attempts to set up equations based on Newton's second law and the forces involved.

Discussion Status

The discussion includes various attempts to derive the upward force, with some participants providing equations and calculations. While one participant expresses uncertainty about their physics skills, another offers affirmation of the approach taken.

Contextual Notes

Participants are working under the constraints of a homework assignment, which may influence the completeness of their reasoning and the information provided.

john411
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Homework Statement



A 3.0 kg stone is sinking in water at 3.5m/s(squared) what is the upward Force of the water on the stone?

Homework Equations


yeahh it seems simple but I am very bad at physics so..
i put M=3.0kg A=3.5m/s (squared)


The Attempt at a Solution


i found out Fnet is 10.5 because of Fnet= (3.0)(3.5)
 
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there is the upward force and the weight acting. The resultant of those two give the net force
 
rock.freak667 said:
there is the upward force and the weight acting. The resultant of those two give the net force

G-Fwater = ma
(gxm)-Fwater= ma
(9.8x3)-Fwater = 3x3.5
(29.4)- fwater = 10.5
-Fwater = 10.5 - 29.4
-Fwater = -18.9
Fwater = 18.9
 
Looks good.
 

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