Can you check my physics homework please?? 1. The problem statement, all variables and given/known data My physics project includes predicting (1) the time it takes a ball to go down a slide http://i.imgur.com/TfQI87H.png I'm not sure if it's right though. (2) finding the coefficient of friction between me and the slide. http://i.imgur.com/3P8FPOe.png Calculations should be correct for the most part, I'm just not sure if I'm doing stuff right. Particularly, I'm not sure about where it goes ff = fa - fnet because then i found the coefficient to be like .4 and that seems really little considering how the differences in times were a lot more.