Provide a qualitative description of the problem: at
this stage students need to think and write down the
laws, principles, or possible formulations that could
help them to solve the problem. For instance students
need to consider any possible framework of analysis
that could help them to represent or describe the problem in terms of the principles of physics (i.e. Newtons law, energy conservation, momentum conservation, theorem of parallel axis for computing inertia moment, non-inertial reference system, etc.) If necessary,the drawings of the previous step could be complemented by the corresponding free-body and/or vector
diagram.