12/11/08

Flying Pigs!

Honors Physics investigated circular motion using a flying pig today and a fun time was had by all (except the pig who had to fly in a circle all day). Centripetal force is not always the tension in a cord, as for the last lab, it might be a component of that tension and you have to use vector analysis to puzzle that out. Tomorrow - review. Monday - exam.

Physics started defining the descriptors of angular motion and will take it further tomorrow. If you have used radians before, then this is nothing new for you. If you haven't covered that unit in math yet, we are not going to go in any deeper than we did today in class.

Physical Science - as you work on the Work worksheet (!), remember to keep track of the direction of force. Not always is weight the force you want for calculating work. Read the problems closely and consider direction of motion and direction of forces. Note: the answer for the last problem on the worksheet should really be a negative value, although the answer key lists it as positive. From our discussion of positive and negative work, you should be able to tell me why work, for this situation, is negative.

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