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Good idea! I agree we don't want to stump the students. They already find
physics very challenging.
When I ask (peer instruction) questions on Archimedes Principle, I start
with the basics and build from that:
Drop marble into cylinder of water. What happens to buoyant force as it
sinks?
Two bowling balls in aquarium -- one floats, one sinks. Compare buoyant
forces.
Ship sinks in canal lock. What happens to water level in lock?
Ice cube melts in beaker of water. What happens to water level?
Two beakers with water at same level, but one has cork floating. Compare
scale readings.
Stick finger in beaker of water. What happens to scale reading?
So many more. You could do an entire unit/test on this stuff.