Part III: Float a Penny
Test how many pennies can be placed on an index card
before it sinks.
Do the same with a popsicle stick.
See how many rocks/pennies can be placed on a piece
of bark before it sinks or tips over.
Part IV: Float AND Sink
Try to make the following items float. Then try to make
that same object sink. Do not place anything on it. Try: