When I wind the stick, I move. This moving is kinetic energy. Where does my energy go?
My kinetic energy goes into twisting the rubber band, where it is stored as elastic energy. Elastic energy is potential energy. It is ready to make something move.
What happens to the potential energy stored in the rubber band, when I let the wind-up go?
The potential energy in the rubber band is used to make the wind-up go. Potential energy is changed into the energy of motion which is called kinetic energy.
If available, show a video or read a book on the different forms of energy
2. Making wind-ups: Students continue working on their wind-ups. Students who have already made wind-ups can make new ones of different types. Provide them with samples of wind-ups with large wheels, small wheels, wheels of different size. As students are working, ask them to keep track of issues that arise. Post the issues on chart paper. Keep this chart for use in Lessons 3 and 5. As students ask for help with problems, identify these as issues, by adding them to the chart. Some examples of issues that are likely to come up:
The rubber band won’t go through the holes.
The wind-up won’t stay together.
The wind-up does nothing at all.
The wind-up moves but won’t go in a straight line.
The wind-up moves, but spins in place instead of traveling