Moving About - that's about motion, mass, momentum (hitting force), tension forces, velocity, vectors, collisions (elastic and inelastic). This is where most of the maths comes in. So you learn to tackle questions like "A 200kg motorbike is travelling at 40km/h and collides head-on with a 2000kg car travelling at 60km/h. What are the final velocities of both?". For this question you just convert both speeds to m/s, then substitute their masses and speeds into a certain formula, simplify then you'll get the answer.
Cosmic Engine is mainly theoretical, not many calculations involved - you learn about the changing views of the Solar System, who was involved, and how they contributed. You learn about luminosity, The Big Bang Theory, star life-cycles (e.g. Supergiants), solar cycles and radiation.