Balance and Ballast Water By Patrick Murphy/ Fraser High School/

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2 direction of a moving object. Key Concept: Buoyancy List of Needed Materials Text book; pencils; paper; clear plastic contained filled with water; piece of wood, metal, rock; sculpting clay, and marbles. Room Arrangement The room is arranged in Horse Shoe, So all seats look up to the front o the room. There two tables in the front that can be used to hold supplies and to show demonstrations. New Vocabulary Buoyant force/buoyancy: The ability of liquid or gas to push up on an object that is in the liquid or gas. Ballast: Any heavy material carried temporarily or permanently in a vessel to provide desired draft and stability. Ballast water: Water used to balance a ship. Displacement: When water goes higher when something is placed in it. Archimedes Principle: The law that a body immersed in a fluid is buoyed up by a force (buoyant force) equal to the weight of the fluid displaced by the body. Cargo: What the ship is carrying. Background Information The Glencoe Physical Science textbook, pages , supported information on this topic. Information was also obtained from Simple Machines, Matter, and Motion student workbooks pages Information about ballast water and Great Lakes shipping was gained from the presentation Exotics and Ballast Water by Dale Bergeron and Doug Jensen through the Minnesota Sea Grant on July 30, Pre-Assessments Ask questions about which of the following materials: piece of wood, metal, or rock will float in water. Have class come up with answers why. Review concept of density. Focus Questions Why do some object float? Why do some objects sink? How can things made out of metal float? What is balance? How does balance effect a floating object? Attention Getter The educator will drop each of the following object into the water. The students will have to guess which objects will float and which ones will not. Describe Classroom Activity After the attention getter the teacher will have a pair of student try to sculpt a rough boat shape from the sinking clay lump that will float. After the boat floats, the class will load the boat with marbles on one side. After the boat sinks, the student will balance the boat with water (The educator will assist in forming two simple compartments in the clay boat). 2

3 Assessment The class will complete a lab report after finishing the activity. The next class period, after a short review, the class will take a short quiz on the previous day s activity. Extensions/Enhancements A way to enhance this lesson would be to see some sort of shipping or large boat actually on the water. Students could bring in pictures from a cruise vacation to show the class the ship. The photographs from the Great Lakes Maritime Transportation Summer Institute can also be used to illustrate the immense size of these vessels that float on the water. Resources - Bergeron, D & Jensen, D (2007). Exotics and Ballast Water (presentation). Minnesota Sea Grant. Gattlieb, J (1996). Matter, Motion, and Machines. Texas: Steck-Vaughn. McLaughlin, C & Thompson, M (1997). Physical Science. Ohio: Glencoe/McGraw-Hill. 3

4 Name: Date: Block: Materials: BOUYANCY AND BOATS LAB Clear plastic contained Piece of wood Metal Rock Sculpting clay Marbles. Metal bowl Directions: Experiment to see which of the above materials will float. Sculpt a boat shape out of clay that will float in water. Load your boat with marbles. Use the idea of ballast water to balance boat. Questions: 1. What materials floated? 2. How did you get clay to float? 3. What property of water let the objects float? 4. What is the scientific law that explains this? 4

5 Name: Date: Block: Multiple Choice: 1. A state of matter that has buoyancy is? A. Solid B. Plasma c. Liquid Properties of Liquid Quiz 2. Things that are less dense than water will easily. A. Float B. Dissolve C. Sink 3. When water moves when stuff is in it it is called this. A. Movement B. Splash C. Displacement 4. When the shape of a metal is hollow and able to displace a lot of water it will. A. Still sink B. Float C. Turn upside-down 5. The reason ships float is called this. Short Answer: A. Newton s Rule B. Archimedes Principle c. Socrates Oath In a complete sentence, write how you made the clay float in the boat lab, and why it worked. What was your cargo and ballast? Developed by Participants in the 2007 Great Lakes Maritime Transportation Summer Teacher Institute sponsored by the Great Lakes Maritime Research Institute ( 5

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