# Hooke's Law on a Slope with friction.

1. Jun 15, 2010

### RCulling

1. The problem statement, all variables and given/known data

Question is in attachment

2. Relevant equations

3. The attempt at a solution

I mananged to find the acceleration up the slope but cannot get any further than this?
- can someone please give me hint; push in the right direction

Thanks :D

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2. Jun 15, 2010

### RCulling

Better image here

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3. Jun 15, 2010

Hint (again): energy conservation.

4. Jun 15, 2010

### K^2

Solve it as a harmonic oscillator, but add a constant to the position, so that x(0)=constant. Solve for that constant, and the rest should follow.

Edit: Oh, wow, energy conservation is a lot easier. Never mind.

5. Jun 15, 2010

### RCulling

Mmm energy conservation i get, im just trying to figure out the work done?
I've the force at the most compressed point, but it changes over the 0.2m it acts upon?
- what am i missing?

6. Jun 15, 2010

### K^2

You can separate out the work done against friction. Kinetic energy is trivial. All that's left is to consider gravitational and spring potentials at 0 and at D.

7. Jun 15, 2010

### RCulling

Ok thanks for the helping hints, i'll post back if i still can't get it

- Cheers :D