Newton's Third Law
Forces and Motion

Thinking about actions to take: Force Pairs Replace Interactions

Teaching Guidance for 14-16 Supporting Physics Teaching

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

Try these

  • using interaction diagrams
  • connecting the study of Newton's third law to earlier understanding of Newton's second law

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

  • presenting the law as obvious
  • presenting the Newton three pair of forces as both acting on one object

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.

Newton's Third Law
is used in analyses relating to Collisions

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