Part 1 What type of heat transfer is demonstrated in Part 1? How long did it take for the butter to melt off of the plastic fork? The metal fork? How do explain the difference in time between the two forks? Part 2 What type of heat transfer is demonstrated in Part 2? What happened when the warm water bottle was placed over the cold water bottle? Why? What happened when the cold water bottle was placed over the warm water bottle? Why?