October 12, 2015 Matter- Any substance that has mass and volume. Mass- The amount of matter(atoms) in an object. Weight- Measures the force of gravity Volume – The space an object occupies. Density- Is the ratio of mass per unit of volume. Compares the amount of matter to the amount of space that matter occupies. Density measures how much stuff is packed into a certain amount space. Density =How much stuff Density = Mass / Volume / packed into a certain amount of space October 12, 2015 The amount of matter in the object does not change* The force of gravity can change. Therefore mass will not change but weight can change Is air matter? Does it have density? October 12, 2015 How can you determine the density of an object by how it floats? Water (density 1.0g/ml) , Salt water (density 1.7g/ml) & a metal marble (density 1.3g/ml) were all placed into the same graduated cylinder. Draw a diagram showing how they would layer. October 12, 2015 1. a. b. c. Use the data to construct a graph on the grid provided. (5pts) Create an appropriate label and scale for the “Y” axis. Plot a line graph for object A and label the line “Object A.” Plot a Line graph for object B and label the line “Object B.” Table #1: Object A TableSample #2: Object # B 3 Volume Mass (cm (g) ) Sample # 3 Volume Mass (g) ) 1 (cm 2.0 5.0 1 3.0 12.0 2 5.0 12.0 2 5.0 20.0 3 10.0 25.0 3 7.0 28.0 Why does it look like the bubble is floating in the middle of the air? October 12, 2015 What happens to the density of an object when you change the size of the object? Does a pond freeze from the top of the water to the bottom or from the bottom of the water to the top? Provide a detailed explanation for your answer. October 12, 2015 What is Buoyancy? Buoyancy: The Force of a fluid pushing up on an object. Fluid: Any liquid or gas. • The type of fluid determines the amount of Buoyancy. • Increasing the surface area of an object can increase Buoyancy. Gravity: Force that pulls “down”. (Earth Gravity- Force that pulls down to the center of the earth.) When there is a balanced force between gravity and buoyancy an object is said to be neutral buoyant.