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UFM A1 Video Clip 1: Group 3 discusses their initial ideas
In this short clip, the group quickly agrees on the shape of the speed-time graph for the ball. In briefly discussing where there is a force pushing the ball forward, Kate thinks it would only be where the foot is in contact, but Nikki suggests it might be all the time that the ball is moving. They then use ideas about energy to explain why the ball slows down.
UFM A1 Video Clip 2: Group 3 continues discussing their initial ideas
The group discusses what forces are acting on the ball during and after the kick. Lynn seems to suggest a 'backward' force after the kick, but Kate suggests a downward force that Nikki thinks might represent gravity. After Nikki also talks with a neighboring group, they decide to include both friction and gravity in their diagram.
UFM A1 Video Clip 3: A class discusses their initial ideas
Some groups discuss their ideas about when there is a force pushing the soccer ball forward. Some of those who initially think this is only during the kick seem to be at least somewhat persuaded by others that there must be a force pushing forward all the time that the ball is moving.
UFM A1 Video Clip 4: Another class discusses their initial ideas
Some groups present their initial ideas to the class. Sue uses ideas about energy from a previous unit in her description. There seems to be some confusion about what they were actually asked to highlight on their graphs, and the instructor clarifies. As a result, Wendy erases some of the highlighting on her group's graph.
UFM A1 Video Clip 5: Initial ideas about how to represent friction
Three groups all agree that friction is what slows the ball after the kick, but represent it using arrows pointing in three different directions. The instructor asks the class about the differences and even more ideas emerge. Faith suggests friction is not really a push, while Sue (off camera) again explains her thinking in terms of energy ideas. Maggie further explains her group's force-based idea.
UFM A1 Video Clip 6: Group 9 discusses their predictions
This group uses their initial idea that a forward-pushing force is only present when the cart's speed increases. From this, they predict that the force-time graph should be 'squiggly', dropping to zero in between the pushes.
UFM A1 Video Clip 7: Group 5 discusses their predictions
The group discusses their thinking about when there is a force pushing the cart forward. They stick with their initial idea that there must be such a force the whole time it is moving, but they have different ideas about what the force-time graph would look like.
UFM A1 Video Clip 11: The class discusses Summarizing Question SQ #2
The instructor poses a clicker question to start discussion of question SQ #2. Two groups propose that a force is transferred, based on the observation that the cart continues to move and their interpretation of the speed-time graph. Liz argues that force is not transferred, basing her argument on the observed force-time graph. A second vote shows that the class is persuaded by her argument.
UFM A1 Video Clip 12: The class discusses Summarizing Question SQ #4
The instructor poses a clicker question to start discussion of question S4. One group proposes that both force and energy are transferred and another proposes that only energy is. A question is then raised about the context of the question and the instructor attempts to clarify it for the class. This prompts some groups to change their response. The instructor summarizes the ideas of the class and prompts them to keep considering this question as they move on in the unit.
UFM A1 Video Clip 1: Group 3 discusses their initial ideas