I'm trying to collect the 10 (at most, 7 optimum) most important concepts of physics in classical mechanics. If you were left with 7 different concepts, what would you pick? (Assuming you have to live the rest of your life with the 7 concepts that you picked) This is "just for fun", not a question Some concepts include: 1. Moment of inertia 2. Conservation of mechanical energy 3. Newton's 1st, 2nd, and 3rd laws 4. Newton's law of universal gravitation 5. Conservation of angular momentum 6. Torques and their conditions of equilibrium 7. Rotational kinetic energy so on so forth What would your list be??