• Support PF! Buy your school textbooks, materials and every day products Here!

Conservation of energy II

  • Thread starter Aggie
  • Start date
  • #1
21
0
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
960
0
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
0
is my equation right or wrong
 
  • #4
5,428
291
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 ...
 

Related Threads on Conservation of energy II

Replies
10
Views
2K
Replies
4
Views
5K
Replies
3
Views
2K
  • Last Post
Replies
5
Views
3K
  • Last Post
Replies
2
Views
869
  • Last Post
Replies
16
Views
12K
Replies
14
Views
1K
  • Last Post
3
Replies
66
Views
4K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
4
Views
6K
Top