We did a lab where we dropped three spheres into two different fluids, measured their velocities, and found drag coefficients. We were also asked some theory questions, and these are what I need help with. Spheres: 3.175 mm, 0.05 g Teflon 6.35 mm, 0.375 g, aluminum 12.7 mm, 8.36 g, steel Fluids: Water (density 998 kg/m^3) Sugar water (density 1230 kg/m^3) Questions: 1 - Why did some of the spheres of low density plastic follow an oscillating path as they fell? 2 - Explain why some spheres tended to bounce along the sides of the wall as they fell. In particular, explain what drew the spheres into the wall, and pushed them away after contact. 3 - Explain why a streamlined body can fall at an angle, rather than straight down. I would guess that vortex shedding has something to do with the first two, but don't really know. Any help (or links to some sites with relevant theory) would be much appreciated. Thanks.