1. What is heat? What causes heat to flow between objects? Give an example illustrating heat flow between objects and explain why that heat is flowing. Cite evidence from the Energy Interaction Model.

2. What do you think "work' is in a scientific context? What are three things you know about work? Be sure to cite evidence (including from your own personal experience).

3. How might heat and work be different? How might they be similar? Use the CER framework where the evidence will come from your previous answers to this Thinkabout.

CER is claim, evidence and reasoning

GRAPHICAL REPRESENTATION The Energy-Interaction Diagram This is a generic example involving two physical systems (Physical Thing #1 and Physical Thing #2), three Energy Systems, and energy being added to the system as heat: Identification of beginning and end of interval: Beginning End Description Description initial conditions final conditions physical system physical thing 1 physical thing 2 heat Q physical thing 1 indicator a indicator a indicator b I El,a 1 El,b I E2,a ai Or = of = bi = of bf = ( + ) (- ) ( + ) (- ) Q = AEl,a + AEl,b + AE2,a