Marbles
String
Yarn
Electric car
Pendulum launcher gun
Wood blocks
Foam tubing
Baking Soda
Vinegar
Balloons
Most if not all the materials should be in the storage room. Except balloons, Keyur will bring balloons. Constructing a device that will flip the switch on one of the electric cars seems very challenging. And lining up the gun with the object it's meant to hit will be troubling as well since so many factors play into the trajectory of the ball. If it misses, that will be a big problem.
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