Calculating the Velocity of a Block on an Inclined Plane with Friction

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Homework Help Overview

The discussion revolves around calculating the velocity of a block moving up an inclined plane with friction. The problem involves understanding the forces acting on the block, including gravitational force and friction, as well as the initial conditions provided.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • The original poster presents two different expressions for the velocity of the block after moving a distance d and seeks clarification on which is correct and the reasoning behind it. Some participants question whether the original poster is seeking help with homework or simply trying to understand the discrepancies in their calculations.

Discussion Status

The discussion is ongoing, with participants exploring the validity of the expressions provided by the original poster. There is a request for the original poster to explain their reasoning, indicating a focus on understanding the problem rather than simply obtaining a solution.

Contextual Notes

There is a concern regarding the nature of the original poster's inquiry, with some participants questioning if it constitutes asking for homework help. The original poster expresses confusion over differing answers and seeks clarification on their understanding of the problem.

monarchus
A block of mass m is pushed off with an initial speed u so that it moves up a rough plane inclined at an angle @ to the horizontal. the friction between the block and the plane is R. Deduce an expression for the velocity v of the block after it has moved a distance d along the inclined plane. Explain any additional symbols in your expression.


which is correct:

(1) 1/2mu^2 - mgd sin @ - Rd = 1/2mv^2
v = [ (mu^2 - 2mgd sin @ - 2Rd) / m]^1/2

(2) 1/2mu^2 - mgd sin @ - Rd = mgd sin @ + 1/2mv^2
v = [ (mu^2 - 4mgd sin @ - 2Rd) / m]^1/2


AND WHY?

thank you.
 
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Are you asking us to do you homework for you?
 
Topher925 said:
Are you asking us to do you homework for you?



well, i did it. Just get different answer from the answer given. Asking why is it like that because i don't understand, is this called asking you all to do my homework for me? well, personally, i don't think so. but if you think so, then it's fine with me. I'll apologize.
 
Why don't you explain how you arrived at each expression?
 

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