I'm a little confused on how to answer Physics questions in correct decimal places. In Math, I'm used to just giving a couple decimal places and that's fine. In Physics, you do all this rounding over and over and by the end you can be off by many whole numbers. For instance, I took a simple problem and my answer was off quite a bit.. Problem was "If a static coefficient of static friction between a dresser and the floor is 0.45, what is the magnitude of minimum horizontal force needed to move a dresser of 28kg." F = .45(9.8)(28) Simple enough.. my answer was 123.48N I look at the answer and it's 120N. How and Why did they round like that?? Thanks.