This paragraph contains no physics: This topic should really be part of the earlier chapter on gravity. It makes no sense to teach gravity without this, even for the purposes of SL. I’m not diving this chapter into subsections since I feel that the divisions don’t make much sense.

G and E fields, potential gradient

Field lines

Potential (point charges and for uniform field strengths) and potential energy, equipotential surfaces.

Orbital motion, speed, and energy. Escape velocity.