Kinetic friction between the box and the ramp

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Homework Help Overview

The discussion revolves around understanding kinetic friction in the context of a box sliding down a ramp inclined at 30 degrees. The original poster is attempting to determine the coefficient of kinetic friction given the acceleration of the box.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants are discussing how to calculate the normal force and frictional force on an incline without knowing the mass of the box. There are questions about how to find the acceleration without friction and how to set up the force equations based on the free body diagram.

Discussion Status

The discussion is ongoing, with participants exploring various interpretations of the forces involved. Some guidance has been offered regarding the use of free body diagrams and force equations, but there is no explicit consensus on how to proceed without additional information.

Contextual Notes

Participants note the absence of mass in the problem statement, which complicates the determination of the normal force and frictional force. The original poster expresses uncertainty about starting the problem, indicating a need for clarification on the setup.

allblonde
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Coefficient of kinetic friction

:confused: so I am working on the force of friction and overcoming friction
i know that the coeffcient of friction is equal to the kinetic force over the normal force and i can get these when hte system is on a horisantal surface
But i don't understand how to get them with an incline

Problem: a box slides down a 30 degree ramp with an acceleration of 1.2 m/s squared. Determine the coefficient of kinetic friction between the box and the ramp.

im not sure i even know where to start, well i have a free body diagram
 
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ok so i got that the force perpendicular (x) - (subtract) the force of friction = mass*acceleration of x
but the question does not give you a mass!
how do i determine the normal force if i don't have a mass?
 
What is the acceleration down the ramp with no friction?

Dorothy
 
um it says 1.2 m/s squared
 
That is WITH friction. What is it without friction?
 
how do i find that out? i don't know what the force of friction is in this problem
 
allblonde said:
how do i find that out? i don't know what the force of friction is in this problem

Well, let me put it to you this way. You have a freebody diagram. What are your force equations? Let's take a look at those.
 

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