Conservation of energy II

  • Thread starter Aggie
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  • #1
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A block of mass 0.08 kg is pushed against a spring with spring constant k=31 N/m. The srping is compressed 0.15 meters from its natural length. The block is released and it slides along a surface with coefficient of frition 0.45. How far does the block travel from the point at which is is released?


I am having a problem developing an equation for this. It seems i am always short on something.

this is what i have so far

Work due to friction - work due to spring = work due to spring - work due to friction.

I know i am missing something but i don't know what it is.
 

Answers and Replies

  • #2
961
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Assume it is all horizontal. You have an initial set of numbers to calculate the force along the x axis and the frictional forces, Soecifty these, and we can help more.
 
  • #3
21
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is my equation right or wrong
 
  • #4
5,432
292
Your equation says

1 = -1

Forget the spring and think about what happens if you just push the block with force f for 1 cm. Then return to the spring ...
 

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