A girl coats down a hill on a sled

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Homework Help Overview

The problem involves a sled moving down a hill and reaching level ground, where it comes to a stop due to friction. The context includes concepts from dynamics and friction, specifically focusing on the sled's motion and the forces acting on it.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants express uncertainty about how to begin solving the problem. One suggests drawing a free body diagram to identify the forces acting on the sled. Others mention relevant equations of motion and friction but do not elaborate on their application.

Discussion Status

The discussion is in the early stages, with participants sharing their initial thoughts and challenges. Some guidance has been offered regarding the use of free body diagrams and relevant equations, but no consensus or clear direction has emerged yet.

Contextual Notes

Participants are grappling with the initial setup of the problem and the necessary components to consider, such as forces and motion equations. There is an emphasis on breaking down the problem into manageable parts.

chenny
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reaching level ground at the bottom with a speed of 7.0 m/s. the coefficient of kinetic friction between the sled's runners and the hard, icy snow is 0.050, and the girl and sleed together weight 645 N. how far does the sled travel on the ground level before coming to rest?
 
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chenny said:
reaching level ground at the bottom with a speed of 7.0 m/s. the coefficient of kinetic friction between the sled's runners and the hard, icy snow is 0.050, and the girl and sleed together weight 645 N. how far does the sled travel on the ground level before coming to rest?

What have you tried so far? Where are you running into difficulty?
 
i just took one look at the problem and my mind went blank. i totally do not know how to start it.
 
chenny said:
i just took one look at the problem and my mind went blank. i totally do not know how to start it.

Draw a free body diagram. What are the forces acting on the sled?

Remember to break everything up into x- and y-components.

v_{f}^{2}=v_{i}^{2}+2ad

v_{f}=v_{i}+at

x_{f}=x_{i}+v_{0}t+\frac{1}{2}at^{2}

F_{k}=\mu_{k}N

F=ma

w=mg
 
Last edited:

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