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Energy methods problem

  • Thread starter ecthelion4
  • Start date
  • #1
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Homework Statement



How much work must be done by frictional forces in slowing a 1000kg car from 24.9 n/s to rest

Homework Equations





The Attempt at a Solution



I just never fully understood how slowing down worked. I just need a nudge in the right direction not you guys doing the work for me. I don't think I'm supposed to do a force analysis, but then again I don't know how to do the problem.
 

Answers and Replies

  • #2
PhanthomJay
Science Advisor
Homework Helper
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Homework Statement



How much work must be done by frictional forces in slowing a 1000kg car from 24.9 n/s to rest

Homework Equations





The Attempt at a Solution



I just never fully understood how slowing down worked. I just need a nudge in the right direction not you guys doing the work for me. I don't think I'm supposed to do a force analysis, but then again I don't know how to do the problem.
If you are familiar with energy methods, you should start there. Look at the car's mechanical energy at the beginning and at the end of its motion. Assume level ground.
 
  • #3
79
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You will set the frictional force equal to the force required to slow the car from 24.9 m/s to 0 m/s.
 

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