I noticed that when I drop a round rock in the lake it splashes higher than a flat rock (I was surprised--I thought it would be the other way around). I decided to make this into a home school science project. I made spheres and flat shapes the same mass out of modeling clay and took videos of my mom dropping them at the same time. The sphere splash was higher (I did 10 replicates). I also tried hemispheres--again the round side down made a higher splash. I tried looking up fluid dynamics on the web but the math was too difficult. It must have something to do with the way the water moves around the shape, but I'm not sure how--is it easier to move around the sphere and so it loses less energy? Thank you for your help.