There's a good chance you could improve your teaching if you were to:
- separating the pull of gravity acting on an object from any compression or tension forces supporting the object
- exploring situations where gravity still pulls, but there is no atmosphere
- modelling the action of the pull of gravity as a force
- drawing forces precisely
Work through the Physics Narrative to find these lines of thinking worked out and then look in the Teaching Approaches for some examples of activities.
- conflating mass and
- restricting drawing the pull of gravity on objects to situations where these objects are falling
- being casual with the term
- stating that a force is zero, when it's only very small
These difficulties are distilled from: the research findings; the practice of well-connected teachers with expertise; issues intrinsic to representing the physics well.
This appears as Es01TL as Es01TLnugget08 in the full materials.