Today, Hunter summarized Romeo and Juliet, and then wrote a persuasive writing journal about the driving age. After discussing errors in point of view shift, diction, and omissions, he revised his journal.
Constructed third-generation rocket nozzle using fiber-reinforced epoxy with integrated threaded cap. Additional discussion about the relationship between outlet diameter, area, and effect on flow velocity and thrust.
Review of Newton's Third Law (Action/Reaction) as applied to rocket thrust. Designed plan and conducted internet research to create a more robust (waterproof) means to quantify thrust of water rockets. Discussed important differences in chemical/combustion vs. water rockets, leading to conclusion that de Laval nozzle is probably less appropriate than a tapered cone nozzle. Also discussed fins, nose cone, and aerodynamic aspects of our experimental water rocket design.
Hands-on Project: Upon examining low radial symmetry and surface irregularities in prototype 1, we modified our casting technique to successfully produce two very symmetrical prototypes, upon which we successfully performed static flow tests.
Hands-on Project: Developed wax epoxy casting technique to generate variations on the "de Laval" rocket. Discussed design requirements in terms of strength, weight, cost, and dimensional tolerances.
End of the Year Project: Science of Bottle Rockets
Lesson Outline
Researched several examples of modern rockets and discussed the function of various parts. Introduced basic concepts of rocket nozzle physics with emphasis on the "de Laval" rocket nozzle function and design. Used other rocket science content from NASA.gov website. Outlined plan to create the ultimate water rocket for launch on school-wide rocket day in January.
Revisited concept of the free-body diagram as a means to understand the physics of moving objects. Revisited the concepts of net force and vector addition by solving practice examples from the text.
Demonstrated a tangible application of vector addition by changing position and orientation of two separate thrust sources (electric motor-driven propellers). Tested the effect of decreasing friction by using upward thrust in addition to horizontal thrust.
Connected concepts of thrust (force), mass, and acceleration through creation of a device to more accurately quantify thrust output from electric prop motor. Hunter devised a simple method to collect readings via a motor mounted to a digital scale. Practiced unit conversion from weight reading into Newtons.
We executed a "sketchercise." Hunter sketched a cliff-dweling, southwestern native American colony based on what we had learned about Mesa Verde in Utah and Bandelier National Monument in New Mexico.
Assignment
None.
Session Minutes
60
Minutes Student Attended
60
Lesson Comments
We had a curtailed instructional session today so Hunter could take part in the "Christmas Around the World" activity. He did give his best shot on the sketchercise."