# Factory boxes

1. Mar 27, 2013

### Robertoalva

1. At the end of a factory production line, boxes start from rest and slide down a 34° ramp 5.4 m long. If the slide is to take no more than 3.2 s, what is the maximum allowed frictional coefficient?

2. Relevant equations
Ff= μ F

3. The attempt at a solution

2. Relevant equations

3. The attempt at a solution

2. Mar 27, 2013

### Sunil Simha

Hi Robertoalva,

Could you show where you are stuck in the problem please?

3. Mar 27, 2013

### Robertoalva

I don't know how to use the equation for the frictional coefficient! I suppose that I have to use another equation that uses time, but i'm not so sure!

4. Mar 27, 2013

### Sunil Simha

Well, frictional coefficient is the ratio of the magnitudes of the normal force and maximum frictional force possible.

Knowing that, what would be the acceleration of the block?