Ss identify forces. T prompts, they identify no more forces. Ss to describe how the bottle will be a rocket, S describes verbally and gesturally. T notes the interesting shape of the bottle's nosecone. Ss explain how they will make nosecone.
T asks about the relationship between aerodynamic shape and forces.
S replies, T expands on reply. T continues expansion on friction and gravity, B nods, J plays with bottle. J responds, T expands on scenario while J traces trajectory with bottle. T asks about the effect of bottle shape on its trajectory, B explains. T asks about texture, pointing at bottle, asks about the possibilities for rocket finishes.