Calculating Frictional Work on a Moving Car

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Homework Help Overview

The discussion revolves around calculating the work done by frictional forces to slow a car from a specific speed to rest, focusing on the principles of energy and friction in a physics context.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the relevance of using the coefficient of friction versus an energy approach to solve the problem. There is an exploration of kinetic energy equations and how they apply to the scenario presented.

Discussion Status

Some participants have offered guidance on using energy concepts rather than friction directly. There is a progression in understanding as one participant attempts to apply the kinetic energy formula, and feedback on the method has been provided.

Contextual Notes

The original poster expresses uncertainty about how to integrate the various elements of the problem, indicating a need for clarification on the approach to take.

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Homework Statement



How much work must be done by frictional forces in slowing a 1000kg car from 29.8m/s to rest?


The Attempt at a Solution



Im not quite sure how to go about this problem. I know the frictional force is 9800N times the coefficient of friction. And I know the car isn't accelerating prior to slowing down. I am not quite sure how to fit this all together. A little guidance would be greatly appreciated =)
 
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Working with the coefficient of friction is the wrong approach for this. Use an energy approach. How much energy must be converted to heat?
 
oh I get it I need to use the kinetic energy equation from 28.9 to 0?
 
I plugged it into the equation 1/2(m)v^2 and solved from 0 to 28.9. My answer was 444020 J. Does this seem like the right method?
 
Looks good!
 

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