If you haven’t finished your design sketch you should do that.
When you finish your sketch:
If you have your materials you should start building your car.
If you don’t have your materials you should add color to your sketch if you haven’t already done that
If you’ve colorized your sketch but don’t have your materials you need to find something to from another class to work on that doesn’t cause you to be a distraction.
If you finish building your car, one group at a time can test their cars in the hallway.
Just so everyone is on the same page, here is a section from the instructions I left for the substitute:
We started a mousetrap car project on Monday. I gave all my classes the choice between watching a video today or working on their projects. They all chose to work on their projects. So there is no set in stone lesson plan. But for the most part they should be on task. The kids are working in groups of 1, 2, or 3. If they have their supplies here today then they can start building their cars. If they don’t have their supplies here they may still be working on creating their design sheets. If they’ve finished their design sheet but don’t have their supplies then they need to find something else to work on but they should most definitely not be a distraction. They should be actively engaged.