These wheels roll straight. |
It's hard to make one wheel roll straight. It wobbles and falls. |
A lot of time was spent readjusting the clothespins to keep the ramp up! |
Around the corner! |
Sometimes the axel needs to be cut once it starts to bend. |
We are ending the unit by manipulating runways for a marble to roll through.
Down the hill, up the hill and back down again. |
Around the corner. |
Three runways! |
Working together! |
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