There's a good chance you could improve your teaching if you were to:

Try these

• working mostly with contact forces
• emphasising the connection between resultant force and changing motion
• focusing on the forces acting on a single object before trying to predict its motion
• using only the resultant force to predict the motion

Teacher Tip: 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.

Avoid these

• suggesting that force is the kind of thing that might run out
• discussing multiple objects at once
• speaking as if component forces are trying to make the object do something

Teacher Tip: These difficulties are distilled from: the research findings; the practice of well-connected teachers with expertise; issues intrinsic to representing the physics well.