Physics Problem: Work and Force on a Skier Coasting Uphill with Friction

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Homework Help Overview

The discussion revolves around a physics problem involving a skier coasting uphill on a slope with friction. The problem requires calculating the work done by kinetic friction and the magnitude of the kinetic frictional force, given the skier's mass, initial and final speeds, and the slope's angle.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the definition of work done and its relation to kinetic and potential energy. There is an attempt to clarify the formula for work and its application to the problem.

Discussion Status

The discussion is ongoing, with some participants providing definitions and attempting to clarify concepts related to work and energy. There is no explicit consensus on how to approach part b of the problem, and further exploration of definitions and methods is encouraged.

Contextual Notes

Participants are navigating different definitions of work and its application in the context of the problem. There may be assumptions about the skier's motion and the effects of friction that are being questioned.

pvwill18
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A 71.8-kg skier coasts up a snow-covered hill that makes an angle of 25.1 ° with the horizontal. The initial speed of the skier is 8.84 m/s. After coasting a distance of 2.10 m up the slope, the speed of the skier is 3.41 m/s. (a) Find the work done by the kinetic frictional force that acts on the skis. (b) What is the magnitude of the kinetic frictional force?

Part a= -1761 J

I Just can't figure out how to find part b
 
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What is the definition of work done?
 
Work done is equal to KE+PE so kinetic energy final + mgh- kinetic energy intial+ mgh where kinetic energy is 1/2mvsquared
 
There is another definition of work done which says
W=r \cdot F

Try it now.
 

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