Student Exploration: Archimedes’ Principle

Name: ______________________________________ Date: ________________________ Student Exploration: Archimedes’ Principle Vocabulary: Archimedes’ principle, buoyant force, density, displace, mass, volume, weight Prior Knowledge Questions (Do these BEFORE using the Gizmo*+ 1. Why does a small pebble sink in water? _Because its density is higher than that of the water____ _________________________________________________________________________ 1. A motorboat is a lot heavier than a pebble. Why does the boat float? ____because the boat is less dense than the surrounding water_______ Gizmo Warm-up When you place an object in liquid, the downward pull of gravity causes it to start to sink. As the object sinks, the liquid pushes back up on the object with a force that opposes gravity. In the Archimedes’ Principle Gizmo, you will see how these forces cause objects to either sink or float. 1. Check that the Width, Length, and Height of the boat are set to 5.0 cm. Drag one of the green 50-g cubes into the rectangular “boat.” What happens? __The boat sank slightly and water was displaced __ 2. Add cubes until the boat sinks. What mass of cubes causes the boat to sink? _150g_ (Note: In this Gizmo, the mass of the boat itself is insignificant.) 3. Click Reset. Experiment with different boat dimensions until you create a boat that holds the most cubes without sinking. A. What are the boat’s dimensions? Width: _10g_ Length: __10g__ Height: _10g__This study source was downloaded by from CourseH on :13:30 GMT -06:00 2018 B. How much mass can the boat hold without sinking? ____190g_____This study source was downloaded by from CourseH on :13:30 GMT -06:00 2018 Activity A: Displaced liquid Get the Gizmo ready:  Click Reset.  Set the Width, Length, and Height to 5.0 cm.  Be sure the Liquid density is set to 1.0 g/mL. Question: How does the mass of the boat relate to the amount of displaced liquid? 1. Observe: Place several of the 50-g cubes into the boat. What happens to some of the liquid in the tank? __The liquid is displaced ___ The liquid that is pushed into the graduated cylinder is called displaced liquid. 2. Predict: How do you think the mass of the boat will relate to the amount of displaced liquid? ___for every 50g of mass it will displace 50mL of liquid_____ 3. Observe: Click Reset. Drag two cubes into the boat, yielding a total mass of 100 grams. How much water is displaced into the graduated cylinder? (Units are mL.) _100mL