Today we discussed Atwood machines, or number 7 on the worksheet. For letter 'a', C has the greatest unbalanced force because more gravity is pulling down upon it. For letter 'b', we decided A has the least inertia because it has the least mass. Mr. Dickie decided that we do not know how to do letter 'c' because we did not do the lab that went with it.
Before we came to this conclusion, we talked about what a pulley does. It changes the direction of a force. We also came to the conclusion that an elevator, because of the counterweight in its cables, takes very little force to move.
Also, Mr. Dickie came up with a scenario where there were two blocks, where one was heavier than the other, and we were asked what the acceleration would be. We said it would be 3.3 m/s/s. After much discussion about how this is one system and using the acceleration equals unbalanced force/mass, or 10 N/3.0 kg, turns out we were right. We spent the entire class discussing this fact.
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