Change densities, see FBD of moving object
Category: Buoyancy
Put block in a liquid, see change in weight
Play with densities, see forces
https://phet.colorado.edu/sims/density-and-buoyancy/buoyancy_en.html
Change liquid, g, densities, see change in weight on graph
http://www.thephysicsaviary.com/Physics/Programs/Labs/ForceBuoyancy/index.html