A big part of the physicist job is to know which factor aren't relevant in a simulation. You may have heard about approximation like sin(\theta) = \theta or let's assume a Gaussian distribution

it's relatively easy to compute the noise of a flat surface falling over a flat surface at a given speed. However, the more factor you add, the more complex is the problem. A good thing is that for a simple phenomenon like that, you'd get something close from real-work even with some approximations. It's more complicated for example for more "chaotic process" for example once a dice bounced-roll a few time, small difference in the exact position at the first bounce will lead to a different result, making very hard to do a proper simulation