In this unit, an explanation of how a certain action in the real world leads to a particular observable outcome should use the energy model of interactions to clearly connect the two. To do this, the type(s) of interaction involved (up to now it has only been the contact push/pull) need to be identified, and ideas about energy transfers and what effect these have on the different types of energy associated with the objects involved should be used.

Remember, a complete explanation should consist of two parts:

I. Describe the model using a diagram

Since we are using a model that uses ideas about energy transfers and changes during interactions between objects, it will usually be appropriate for an explanation to start with a G/R energy diagram for the relevant interaction(s).  

II. Write the Explanation Narrative

The G/R energy diagram should guide the written part of the explanation; that is, it should translate the various parts of the energy diagram into words. It should also connect the change in the relevant type of energy to the observable outcome.

  Next: Structure of an Explanation.