Chapter 3, Section 3 Pg. 82 Floating and Sinking Archimedes’ Story How can I figure out if it’s real? What’s this? the water rises when I get in!!! Hmmm… Same Weight and Volume? The crown has silver in it and gold is pure! Archimedes’ Story 1. 2. 3. When you place an object in water, the rise in water is due to ______ ___________. Density depends on 2 things, __________ and ___________. Density is the reason objects _________ or _________ in fluids. Volume Density 1. 2. To figure out the Density of an object, divide the object’s ________ by it’s __________. ___________ is how much space something takes up. The Density Triangle Density = mass per unit volume Per means divide! Unit means a single amount. M D V Density Same Volume Different Volume Different Mass Same Mass Density Does greater volume or less mass make Diet Coke float? How do you know? Density 1. 2. 3. If an object is More dense than the fluid it is in, it will _________. If an object is Less dense than the fluid it is in, it will _________. If a block of wood has a mass of 200 grams and has a volume of 4 liters, what is its density? Density Less Dense Dive Dive!! More Dense Buoyancy (Boy – unsee) 1. 2. Water exerts a force called the ___________ force on submerged objects. What does submerge mean? Buoyancy The buoyant force on a object is equal to the weight of the fluid displaced by the object. If they have the same mass why does one sink and the other float? Buoyancy 1. Buoyant force acts in the ________ direction, against the force of __________, so it makes an object feel ________. Density Review 1. 2. 3. Why does a balloon filled with helium rise in air? Why does an ordinary balloon fall in air? How do submarines dive into and rise out of the water?