this is a lab that i've been working on for 3 days alredy, and still cannot fill in the blanks for finding the coefficient of maximum static friction... a wooden block was attatched to a pulley connected to a hanger.. the wooden block was on top of a wooden board.. the goal was to add just enough weight to the hanger to make the wooden block slide... the wooden block was sliding horizontally. for one of my results... the mass of my wooden block was 0.543kg..the mass on the hanger required to move the block was 0.170kg... now i calculated the weight of the block to be 5.32N, and the weight of the hanger to be 1.67N.... now i am asked to find the coefficient of the maximum static friction... and ive tried everything for three days. multiplying and dividing up and down etc... the only equation given is Fs is less than or equal to UsN (U=mu you know that greek symbol). and they want me to find Usmax with that equation. my Lab TA has extremely broken english and when he explains he just expects me to know what he means. the lab instructor is just at the school for research and is never around to care about helping students. a friend of mine told me to find the normal force, which i tried doing by adding the two masses and multiplying by 9.8. but i dont know where to go from there.