This is a fun experiment usine inertia (the resistance to change in a motion of an object).
The only materials required is a stack of coins, all the same denomination (quarters, dimes, nickles, pennies), and a butter knife.
Using a constant motion slice the stack of coins with the FLAT side of the knife. What happens?
If you want to use this for a science fair project you could ask:
What is the minimum number of coins?
What is the maximum number of coins?
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