Lesson 6: The Momentum Equation


  • Concepts. You can explain/apply key concepts1: Surface Force, Body Force, Momentum Flow, Momentum Accumulation, Reference Frame (inertial and non-inertial).
  • Momentum eqn. Your knowledge2 allows you to explain or answer questions about the eqn. You can derive the eqn. You can apply the momentum equation to jets, nozzles, vanes, pipes, and other engineered systems (including moving cvs).


Plan to Reach Goals

  1. Goal Setting. Read the lesson goals. What would an engineer be able to do if they reached these goals? List as many ideas as possible. Mark those ideas that are the most motivating to you. Write down your own goals for this lesson.
  2. Idea generation/planning. How are you going to reach the lesson goals? Write down as many ideas as possible. Select your best ideas. Then, develop your own step-by-step plan.
  3. Knowledge Construction. Acquire knowledge of the momentum eqn. Some ideas to consider. Derive the momentum eqn. Get main concepts by creating MEAC sheets. Get knowledge of the eqn. by creating an ESS sheet.
  4. Procedural Knowledge. Figure out what quality looks like and how quality is produced. Here's how. In your own words, describe what quality looks like when an engineer is applying the momentum eqn. In your own words, write down the step-by-step process for producing quality (text p. 168).
  5. Application. Without looking at the soln, complete example problems 6.1 to 6.7 through the plan stage. Focus on quality. Use the solns in the text to give yourself feedback. Write down your questions.
  6. Application. Practice the PDM process on text problems 6.14, 6.22, 6.51, and 6.61. Focus on figuring out how to solve the problem. Focus on KC (knowing your stuff). Save time by not doing calcs.

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