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# Science Project Help: Dropping rocks into a glass of water?

My little sister is wanting to drop rocks into a glass of water to bring the water to the top of the glass for her science project. She got the idea for this from a story they read in school. My question is, what kind of science would this be? What do we call it? This is a 2nd grade science fair.

Asked by Galikian at 12:32 PM on Mar. 15, 2009 in School-Age Kids (5-8)

Level 3 (16 Credits)
• I would think it is physics. Every action as an equal an opposite reaction.

Answer by drowninginboys at 12:34 PM on Mar. 15, 2009

• It's basic physics-- matter, volume, mass, and density. She should use different rocks with different densities to show that just because a rock is bigger won't necessarily mean the rock will displace more water. Also, she should try using ice-- ice is less dense than water, therefore it will float, but once it melts will there be more water in the glass? You might be surprised at the answer. :)

Answer by Busimommi at 1:49 PM on Mar. 15, 2009

• Physics. Displacement.

Larger rocks, larger displacement.
Smaller rocks, smaller displacement.
Larger porous rocks, less displacement than larger, less porous rocks.

Answer by TiccledBlue at 4:02 PM on Mar. 15, 2009

• If you have any questions about a science experiement for kids, go to Steve Spangler's websight. He has all the experiements and information about them.

Answer by LovetoTeach247 at 5:16 PM on Mar. 15, 2009

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