When we were at school, we dreamed of having a magical machine that solved our math problems and did all of our homework for us. How great would that have been? Turns out this magic machine now exists in the form of an app (there are various apps, actually) - shame I'm not in school anymore.
PhyWiz is an extremely useful and effective application that solves your physics equations and even teaches you how to get to the result (in order to make you feel like you didn't completely cheat). The app is beautifully designed, works flawlessly and helps you do your homework much faster. You could also try it out for fun... whatever floats your boat.