Forces and Free Body Diagrams
Hook
This video describes different forces that are encountered during a roller coaster ride. Potential and kinetic energy are mentioned here. This is a good place to mention frames of reference, which will be looked at with greater detail later in the course. Potential energy is relative and depends on the point of reference at which it is viewed from. It is important to explain the forces as the video is being played. |
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This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. |
Pedagogic Approach
A list of the forces that will be studied should be introduced here:
Free body diagrams are simple representation of a given situation. At this level, object are represented as a particle and forces are limited to 2D vectors. A diagnostic should be administered at this point to verify level of competence with vectors and algebraic manipulation. Without proper knowledge of vectors, solving problems will be unrealistic for students. Using think/pair/share, different scenarios can be presented to students with multiple free body diagrams. It is their goal to determine the free body diagram that correctly describes the given scenario. This will be a good place for assessment as learning. If students are not able to correctly translate a scenario to a free body diagram, they will not be successful in this course. |
Consolidation
Quick demonstration of frictional forces. Either the video can be shown or it can be demonstrated live as it is a simple setup. Exit Slip: What would happen to the motion of cars if frictional forces didn’t exist? This will be addressed in a future class. |
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