Topic: Floating and SinkingStandards 8.c &8.dEssential Question – How can you predict whether an object will float or sink in a fluid?

Question/Main IdeaWhat is Density?A piece of metal has a mass of 43.5 g and a volume of 15 cm3. What is it’s density?D=M/VD=43.5g/ 15 cm3D=2.9 g/cm3Idea: DensityMass per unit volume.Density = Mass VolumeUsing the formula to calculate density:1 cubic centimeter of copper has a mass of 8.8 grams.D=M/V D= 8.8g divided by 1 cm3D= 8.8g/cm3Notes:

Question/Main IdeaWhen will an object float on a fluid’s surface?Idea: Comparing densityBy comparing densities you can predict whether an object or substance will sink or float.If an object’s density is more than a fluid it will sink.If it’s density is less it will float in the surface.If the density is equal it will float at a constant depth.Notes:

Question/Main IdeaWhat is the difference between mass and weight?Idea: Changing DensityAn object can be made to sink or float by changing it’s density.For example: A submarineNotes: