Physics 11 work done by friction

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Homework Help Overview

The problem involves calculating the work done by friction on Magen as she climbs a slide. It includes her mass, the height of the slide, and her velocity at the bottom, suggesting a focus on energy transformations and frictional forces.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss mechanical energy at different points (top and bottom of the slide) and consider the impact of friction on energy loss. Questions about the appropriate equations to use and the relationships between potential and kinetic energy are raised.

Discussion Status

Some participants have provided guidance on tracking mechanical energy and suggested that any missing energy could be attributed to friction. There is an ongoing exploration of energy calculations, but no consensus has been reached on the final answer.

Contextual Notes

Participants are working within the constraints of the problem statement and are considering the implications of energy loss due to friction without resolving the calculations fully.

Iceclover
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Homework Statement



Magen's mass is 28kg. she climbs the 4.8m ladder of a slide and reaches a v3elocity of 3.2m/s at the bottom of the slide. How much work was done by friction on Magen

Homework Equations



Ep=mgh
Ek=1/2mv^2
W=Fd

The Attempt at a Solution


I really just have no idea, could someone just guide me in the right direction or give me the first step?
 
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Think about the following things:
  1. How much mechanical energy does she have at the top of the slide?
  2. At the bottom of the slide?
  3. What could have happened on the slide that would have changed the mechanical energy?
 
Just keep track of the mechanical energy. If any is missing, assume it was lost to friction. What's her energy at the top? At the bottom? Subtract!

(Saketh beat me too it! :smile: )
 
so would i use Eki+Epi=Ekf+Epf?
 
oooh ok i think i get it...i think. The answer i came up with was 1.2x10^3
 

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