Acceleration of an object w/ mass vs. friction

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


An 0.3kg object slides across a surface, experiencing a friction force of 0.2N. If its initial velocity is 2.7m/s, how long does it take to stop and how long does it slide for?


Homework Equations


F=ma


The Attempt at a Solution


I know I'm just missing a simple step or solution, but I'm just at a complete mental block right now.
 

Answers and Replies

  • #2
rock.freak667
Homework Helper
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Homework Equations


F=ma

Maybe you'd want to consider conservation of energy instead as it is a bit easier?
 
  • #3
Spaghett
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What do you mean? I don't think i ever learned that
 
  • #4
rock.freak667
Homework Helper
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What do you mean? I don't think i ever learned that

Ah sorry, I didn't see that you need the time as well.

If you have the frictional force, what is the associated acceleration?

When the mass stops, what is the final velocity?

What kinematic equation do you know involves initial velocity, final velocity acceleration and time?
 
  • #5
Spaghett
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I figured it out guys, simple F=ma, just didn't know i could use the force of friction as F, thanks anyhow
 

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