• Be able to identify force pairs.
  • Being able to tell the difference between equal and opposite forces, such as the tension at two ends of a rope, and force pairs, such as the normal force between a box and ground it lies on.
  • Know when to use the magnitude of a force vs the actual vector.
  • know how to Identify a “good system” so that a force pair might be internal
  • link the idea of action-reaction to the fact all forces must an interactiong between objects.
  • Actions reaction force is equal and opposite, regardless of the mass of each object.