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UPC L5 Video Clip 3: Class discusses movement of particles
Student in class answers the second making sense question at the top of PC-39 about the movement of particles in solids and liquids and gases. There is a question in the class about whether vibration is considered movement. A student responds. [Note: Others also talk but it is hard to hear what they are saying.]
UPC L5 Video Clip 4: Group 2 discusses mass and density
Group 2 discusses two making sense questions at the top of PC-40: do mass and density of brass ring change when it is cooled? Lindsey makes a very interesting comment about thinking conceptually about density versus using the equation mass/volume.
UPC L5 Video Clip 1: Group 1 discusses strength of attraction