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Momentum and Energy

Momentum and Energy. Brian Hitchins. Sources of Difficulty. How to define the system Open or closed system? New term that are closely related to everyday words Translating terms into the “math” Correlation between terms and actual phenomena. How to Help.

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Momentum and Energy

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  1. Momentum and Energy Brian Hitchins

  2. Sources of Difficulty • How to define the system • Open or closed system? • New term that are closely related to everyday words • Translating terms into the “math” • Correlation between terms and actual phenomena

  3. How to Help • Get students to master previous material • Get students to level to be ready for progress • Develop vocabulary • Develop understanding between vocabulary and actual events • Use familiar events

  4. Heat and Temperature • Difference between “heat and temperature” • Teachers use terms indiscriminately • Heat Equilibrium vs. Heat Interaction • Breakdown parts (specific heat, calorie)

  5. Impulse and Momentum • Derived from F=ma • No real explanation why • Problems come when examples are not true examples (ie. Car wrecks, human body)

  6. Conservation of Energy • Not derived by laws of motion • Way it is introduced does not make it clear to students

  7. Work and Heat • Can become complex real quick (shear stress, abrasions) • Price about making things simpler: “converting work into heat”

  8. Deformable Systems • Zero Work Force • Internal energy (human body) • Change in center of mass • Moving arms • Rolling Down Incline Plane • Slippage • Deformed surfaces • Inelastic Collision • Ball hitting a wall

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