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UEM L4 Video Clip 2: Class discusses SQ #1
The instructor calls on students answer SQ #1 part (c). The first student (from Group 7) says the graph would initially go up but then level off as a horizontal line since the speed would then no longer change. Another student from Group 7 gives a different answer to part (c). He thinks that because there is no friction the graph would continue climbing (the speed would continually increase) since there is nothing to stop it from doing that. Jessica from Group 2 disagrees and gives her reason (there is nothing to continue giving it energy so it can't continually speed up). A student from Group 7 then explains what her group mate was thinking: although it's not receiving any more energy there is nothing to slow it down. A different student counters by referring to what they had learned in the previous lesson and argues that if the cart receives no more energy it must continue moving at a constant speed (not speeding up). The original student says he still has doubts but he is not really sure why.
UEM L4 Video Clip 3: Group 1 discusses SQ #2
Group 1 discusses SQ #2. They fill in the diagram quickly. Lauren tells them that the cart also increases in thermal energy and refers to the clicker question at the end of the previous lesson (where the student had left it out of his diagram).
UEM L4 Video Clip 1: Group 2 discusses CQ 4-1