My problem is with this lab on friction...it is a virtual lab, as I attend a virtual high school. I've put in numerous hours and can't seem to figure out what is wrong. You see, we need to determine max static friction and kinetic friction using this program. For all the objects EXCEPT the dog and crate, I did this. But for those 2, there was never a point where the friction dipped....in another words, kinetic never got lower than static, which I KNOW is incorrect. My teacher tried to show me, but now I can;t seem to replicate what she did...she said that kinetic is when the net force=0, both the applied and frictional forces are equal, BUT the object is still moving. Is that correct? If you could please explain to me how to use this program to find static and kinetic friction, I would GREATLY appreciate it. http://phet.colorado.edu/simulations/sims.php?sim=Forces_in_1_Dimension I do have screen shots to show what I am getting...they explain better: http://i38.tinypic.com/16kchsp.jpg Where am I going wrong?? Thank you so much!!