After students have thought about the questions, run the cars and have the students look for when the cars are at the same place. Ask them if the cars are travelling at the speed. This will help them see that the constant speed car is "ahead" of the other car.
The question about when the cars are in "sync" helped them see when they had the same speed.
When they are making their whiteboards, they definitely need reminding that their representations need to show HOW each supports their answers to the questions. I didn't remind them and got some really random drawings. Whoops! When I did remind later period, there were much better diagrams!
I asked students to write their initial ideas to their Idea Journal question for #1 & #2 after we finished sharing.
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