What Went Wrong in My Incline Friction Problem?

Click For Summary

Homework Help Overview

The discussion revolves around a physics problem related to incline friction, specifically involving forces acting on a mass connected by a rope to a hanging mass. The original poster expresses uncertainty regarding their solution and seeks assistance in identifying errors.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the assumptions made regarding the forces acting on the masses, particularly questioning the original poster's assumption that the force of the rope equals the weight of the hanging mass. There is a suggestion to redefine the rope tension and apply Newton's second law to analyze the system.

Discussion Status

Some guidance has been provided regarding the misinterpretation of forces, and participants are exploring the implications of this misunderstanding. The conversation indicates a productive direction towards clarifying the dynamics of the problem.

Contextual Notes

The original poster has attached images of the problem statement and their solution, which are pending approval for viewing. This may limit the full context available for discussion.

houseguest
Messages
16
Reaction score
0
Hello, this is a physics problem I worked out an cannot determine what I did wrong.
Attached is the problem and my solution. Any help would be very appreciated.
Thanks.

Homework Statement


Attached

Homework Equations



F = ma, f_k = Mu_k * N, dx = v0t + 1/2at^2

The Attempt at a Solution


Attached
 

Attachments

  • prb1.JPG
    prb1.JPG
    44.4 KB · Views: 507
Physics news on Phys.org
Looks to me that you assumed the force of the rope on the mass was equal to the weight of the hanging mass. That's not true. (If it were true, the hanging mass would be in equilibrium.)

Instead, call the rope tension T. Apply Newton's 2nd law to both masses, then combine the equations to solve for the acceleration.
 
Ooooh yeah. Thanks!
 

Similar threads

Replies
2
Views
909
  • · Replies 9 ·
Replies
9
Views
4K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 36 ·
2
Replies
36
Views
6K
Replies
19
Views
5K
Replies
1
Views
954
  • · Replies 14 ·
Replies
14
Views
3K