What makes one object float and another sink? If an object floats, how high above the water surface will it rise? In this lab, you will answer these questions by investigating the relationship between density and buoyancy. Lesson Objectives Explain the relationship between density and buoyancy. Solve a problem using the scientific method. PREPARE Approximate lesson time is 60 minutes. Advance Preparation Review the list of materials for the lab prior to the lesson because there are several items that you must supply. Make a cube of ice the day before you conduct the experiment. With scissors, cut the top off the pint-sized cardboard container so that a nearly cubic container remains. Place a piece of string inside the container, with several centimeters of string sticking out. (The string will enable you to easily weigh the ice during the experiment.) Fill the container with water and freeze for 24 hours, so that it becomes a solidly frozen ice cube to use during the experiment. When you are ready to use the ice cube, tear off the cardboard. Return the ice cube to the freezer when you are not using it