What makes the hammer work?
- The first question to answer is “When does the hammer move?” Students should see that the hammer moves when you push or pull the input lever.
- The second question is: “Does the hammer move at any other time?”
- The third question is to help children to focus on directions of movement: “When I push the input in toward the nail, which direction does the hammer go? Which direction does the hammer go when I pull the input out, away from the nail? “
- The generalizations children should make are:
- The hammer only moves when the input moves.
- The hammer moves in the same direction as the input.