# How can I calculate kinetic friction?

1. Oct 23, 2016

### Rick devena

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

A child slides down a slide with a 28 degree incline , and at the bottom her speed is precisly half what it would have been if the slide had been frictionless. Calculate the coefficient of kinetic friction between the slide and the child.
2. Relevant equations

Newtons second law
3. The attempt at a solution

https://www.physicsforums.com/attac...6/?temp_hash=7d75ca4df687186214dd365d2dd18568

#### Attached Files:

• ###### image.jpg
File size:
64.2 KB
Views:
63
2. Oct 24, 2016

### Simon Bridge

I don't understand your writing ... I kinda see a diagram showing some forces, but I don't see a friction force on it, unless that's the "F" pointing down the slide.
There's something that looks like script-written "Als" ... maybe a scribbled $\mu_s$ or something ... cannot tell.