Rock attached to a bucket and beakers
Rock attached to a bucket in a beaker of water with water flowing into another beaker

 

Code Number: 2B40.20

Demo Title: Buoyancy Demo - Archimedes' Principle and Applications

Condition: Excellent

Principle: Archimedes's Principle

Area of Study: Fluids

Equipment: 

Spring scale (40 N), Bucket (galvanized, small), Rock (large), Pail with spout (4 gal. cap.), Beakers (1000 ml) (several).

Procedure:

Make sure to pull the plug and equalize the water level in the bucket several minutes before you drop the rock in so that you know that the water you collect is equal to the volume of the rock.  When the rock is dropped in the scale will decrease about 10 Newton's.  Pour the water back into the small bucket and the scale will go back to the starting weight.

References:

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Video Credit:  Jonathan M. Sullivan-Wood.

2B40.20 - Buoyancy Demo - Archimedes Principle
2B40.20 - Buoyancy Demo - Archimedes Principle and Applications 
2B40.20 - Dr. James Wetzel, PHYS 1611 - Archimedes Principle - Rock in a Bucket