Questions Watch buoyancy lab videos before attempting questions 1 and 2. 1. When samples are just submerged in water, the mass reading increases even though the object doesn't touch the cup. Explain why the reading is not zero. (hint: draw a free-body diagram) 2. When samples are dropped in water and sink to the bottom of the cup, the mass reading changes again. Explain what is happening. (hint: draw a free-body diagram) 3. Indicate where errors may have played a role in the experiment and indicate some possible improvements. 4