Day 136: Board Meeting, Shadows, & Limiting Reactants

AP Physics 1: Unbalanced Torque Board Meeting

Students whiteboarded their results from yesterday. They quickly and easily made the connections I was after and the idea of rotational interia seemed to click well.

AP torque.jpg

Physics: Shadows

I did a quick intro to ray diagrams. I like to clap some chalk dust over the beam from a laser pointer to show the light travels in a straight line. This year, I followed up with clapping chalk dust over a flashlight beam to see the cone of light and motivate drawing multiple rays, which worked very nicely. Students then played with shadows and drew ray diagrams to explain their observations.

Chemistry Essentials: Limiting Reactants

Students worked on some limiting reactant problems. Based on some questions students asked yesterday, we also revisited a reaction we’ve done with magnesium and hydrochloric acid. I set up one flask with indicator and hydrochloric acid to use as a reference. In the other two flasks, I also added magnesium and tasked students with making observations to determine what the limiting reactant was in flasks 2 and 3, which they answered using a CER.

chem limiting 2.jpg

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