# Float a Boat. Design Challenge Learning. challenge- learning

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2 Buoyancy: An upward force acting on an immersed or floating body by the supporting fluid. Buoyant Force: The net upward force exerted by a fluid on a submerged object. Density: A property of a substance, equal to the mass divided by the volume; commonly thought of as the lightness or heaviness of a substance. Displaced: Term applied to fluid that is moved out of the way when an object is placed in the fluid. Elastic Potential Energy: Potential energy due to tension either stretch (rubber bands, etc.) or compression (springs, etc.). Energy: The ability to do work. Appears in many forms, all of which are either kinetic or potential. Equilibrium: A state of balance between opposing forces. Fluid: Anything that flows; any liquid or gas. Force: A push or a pull. An influence on a body or system, causing or tending to cause a change in movement or shape. Gravity: A pulling force exerted by any mass upon another. Inertia: The tendency of matter to remain at rest if at rest, or, if moving, to keep moving in the same direction, unless affected by an outside (or unbalanced) force. Kinetic Energy (KE): Energy of motion. Includes heat, sound, and light (motion of molecules). Mass: The amount of matter that is contained by an object. Momentum: The quantity of motion of a moving object, equal to the product of its mass and its velocity. Neutral Buoyancy: Exists when the weight of the body is equal to the weight of an equal volume of the displaced fluid. The body remains suspended neither rising nor sinking unless acted upon by an outside force. Potential Energy (PE): Energy of position; energy that is stored and held in readiness. Includes chemical energy, such as fossil fuels, electric batteries, and the food we eat. Pressure: The force per unit of surface area; exerted perpendicular to the surface; measured in Pascals. Principle of Flotation: A floating object displaces a weight of fluid equal to its own weight. Speed: How fast an object is moving. The distance traveled over time. Velocity: The speed of something in a given direction. Volume: The amount of space enclosed by a shape or object; how much 3-dimensional space (length, width, and height) it occupies. Weight: The downward force caused by gravity on an object. Resources: The Wind-Powered Commuter Ferry: An article from Popular Science that explores a new High Tech Wing that can be utilized on ferries in order to cut diesel consumption by 40%. The design was developed by a company out of Napa, CA that was exploring options for providing greener transportation on the San Francisco Bay. Buoyancy: A quick overview of how things float and key buoyancy concepts. Mythbusters: Let s Talk Buoyancy : A video where the Mythbusters explain buoyancy and relate it to a pirate myth of turning a rowboat into a submarine. Buoyancy Playground: A buoyancy simulator supported by the University of Colorado Boulder that allows you to manipulate different experimental parameters including mass, volume, density, and fluid. The simulator provides quantitative measurements and allows you to overlay force vectors onto the simulation.

3 Design Challenge Process: The Design Challenge Process is designed so students reinforce their science, mathematics, social studies, and language arts content knowledge, through an open-ended process that results in an original, team-driven solution. Students are expected to take responsibility for assessing their own progress and incorporate peer feedback as they conceptualize and redesign their projects. The process consists of three interconnected steps: Conceptualize Identify problem, materials, and constraints Brainstorm ideas and possible solutions Construct and Test Select a solution Design and construct Prototype Redesign or modify Retest Acquire Knowledge Research Share solutions Reflect and discuss Through the try, fail, learn approach, students develop skills and habits of mind of Silicon Valley innovators: creativity, problem solving, design, collaboration, leadership, risk-taking, perseverance, and learning from failure. Materials: Materials can be limiting or inspirational to students! Have a wide variety of materials to promote a diversity of solutions. Recycled items are really useful: old mouse pads, wood scraps, boxes, cardboard tubes, strawberry baskets, etc. Class Supplies to Share: Plastic Bottles Foam Plates & Bowls Milk Cartons (various sizes) Petri Dishes Pieces of Stiff Foam Styrofoam Peanuts Bubble Wrap Craft Sticks Balloons Rubber Bands Plastic Propellers Paper Clips Aquarium Tubing Thumbtacks Pins Plastic Straws Aluminum Foil Saran Wrap Tape (masking, packing) Pipe Cleaners Scissors X-acto Knife (for facilitator) Tarp Pennies (10-20 per team) Construction Paper Small Inflatable Wading Pool (testing)

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