to find friction force do you use the equation n=mg cos

Answer 1

I suspect you are lost. Here is what I suggest: Go to your college bookstore immediately, and take a look at Schaum's Outline Series, XXXX Physics. There are a number of titles : College Physics, Physics for Engineers; etc. I like the Engineering book,personally.

However all have brief tutorials, with many example problems worked step by step, and other problems with answers. These books are very inexpensive. Take a look.

You can get them online (amazon, BarnesNoble), but I recommend go take a look first.

Answer 2

thanks