Lecture07Notes

Lecture07Notes - 1 Frank L H Wolfs Department of Physics...

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Unformatted text preview: 1 Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Physics 121. Tuesday, February 12, 2008. Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Physics 121. Tuesday, February 12, 2008. • Topics: • A quick lesson on statistics. • Course announcements. • Friction: • A quick review • Drag forces • Gravitation: • The force of gravity • Motion of satellites Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Use and abuse of statistics. • On 1/17 we discussed the 1998 presidential election as an example of the signi¡cance of sampling errors. • Today’s news paper headline is clearly inconsistent with a proper treatment of the data: • Obama: 47% • Clinton: 44% • Sampling error: 5% • If the quotes error correspond to 1 σ , then a difference of more than 1 σ between the two candidates has a 32% probability of being due to counting statistics. • Do you agree with the headline? D&C 2/12/08 2 Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Physics 121. Course announcements. • The solutions of homework set # 2 are now available on the web. • Homework set # 3 is now available on the web and is due on Saturday morning, February 16, at 8.30 am. • The most effective way to work on the assignment is to tackle 1 or 2 problems a day. • If you run into problems, please attend our of¡ce hours and/or ask questions during workshop. Do not wait until the last moment to try to resolve homework related issues. Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Preview of homework set # 4. • On set # 4 you will be asked to carry out our ¡rst video analysis. • You will study the launch of the space shuttle. The main question are: • what is the acceleration of the space shuttle? • what is the force generated by the engines? • You will need to use loggerPro for this analysis. You can download the software from the Physics 121 website. Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Friction. Slowing us down! Key problem: evaluating the normal force. 3 Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Friction. Slowing us down! Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Air “friction” or drag....
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Lecture07Notes - 1 Frank L H Wolfs Department of Physics...

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