most recent 30 from http://physicsteachers.stackexchange.com 2010-03-20T08:42:21Z http://physicsteachers.stackexchange.com/feeds http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://physicsteachers.stackexchange.com/questions/15/tension-scales John Burk 2009-11-05T14:04:24Z 2010-03-12T02:26:25Z

<p>I would really like to purchase a tension scale to measure large forces (1000N-5000N), but everything I seem to find searching online seems to be calibrated in pounds (not ideal) and expensive. Does anyone have any ideas for where to find tension scales that might be cheaper and calibrated in Newtons? </p>

http://physicsteachers.stackexchange.com/questions/10/newtons-third-law-activities teawithbuzz 2009-11-01T19:04:21Z 2010-03-08T12:24:56Z

<p>I'm looking for more Newton's Third Law activities that get students involved. So far I have:</p> <ul> <li>Students pull on each other using rubber bands</li> <li>Students push against each other using bathroom scales</li> <li>Students pull on each other using spring scales</li> <li>Students use two Pasco/Vernier force sensors to graph equal and opposite forces (I don't like this as much because of the time involved in setting up and calibrating, but it works great as a demo in front of the whole class)</li> </ul> <p>What are some good ones that you've done? What have you had the most success with (in terms of students remembering it later)?</p>

http://physicsteachers.stackexchange.com/questions/8/best-online-physics-teaching-resources Jeff Hellman 2009-10-28T22:08:20Z 2010-03-08T01:28:08Z

<p>What resources do you find most useful when preparing lessons, labs, etc?</p> <p>If possible, please link directly to the website using the following notation:</p> <pre><code>[link name](http://example.com) </code></pre> <p>PhysExchange will then nicely format the links so others can use them easily.</p>

http://physicsteachers.stackexchange.com/questions/18/new-physics-resource-physics-podcast unknown (google) 2010-01-26T12:57:46Z 2010-01-26T12:57:46Z

<p>For those who may be interested, students have created a Physics In Action podcast, which is available for free from the iTunes Store (click <a href="http://itunes.apple.com/WebObjects/MZStore.woa/wa/browserRedirect?url=itms%253A%252F%252Fitunes.apple.com%252FWebObjects%252FMZStore.woa%252Fwa%252FviewPodcast%253Fid%253D348148553" rel="nofollow">here</a>). The podcast includes standard episodes featuring students exploring physics in the world around them with segments such as the Physics of Backyard Football, physics in video games and movies, an interview with the author of "The Physics of Superheroes," and research into developing frontiers. Further, review episodes (episode R01, R02, ...) are short teacher-created review segments focusing on basic concepts from the NY Regents Physics Curriculum.</p> <p>We're also very open to collaborating with other schools and students to create content. You can contact the student podcast at PhysicsInActionPodcast@gmail.com, leave feedback on iTunes, or leave a comment on the website at www.PhysicsInAction.com. Thanks for your time!</p>

http://physicsteachers.stackexchange.com/questions/17/seeking-a-good-battery-simulation Leif 2009-11-15T05:32:35Z 2009-11-15T05:32:35Z

<p>"I need to find a good simulation of how a battery works that does not involve a bridge - just Cu and Zn and SO4 solution or something like this. Do you know of anything that is good? I found one with the bridge but i do not like it - too much cognitive overload."</p>

http://physicsteachers.stackexchange.com/questions/1/cheap-stainless-steel-ball-bearings Jeff Hellman 2009-10-27T00:17:37Z 2009-11-01T18:57:44Z

<p>Does anyone know a good, cheap, source for stainless steel ball bearings. I'm looking for roughly 1/2" diameter, but can be flexible on the size.</p>

http://physicsteachers.stackexchange.com/questions/2/atypical-road-tire-coefficient-of-friction Jeff Hellman 2009-10-27T16:37:40Z 2009-10-28T18:59:39Z

<p>What is the typical coefficient of friction between a tire and the road?</p> <p>It seems that with cars now doing 0-60mph (0-~27m/s) in shorter and shorter times that the coefficients must be approaching or exceeding 1. Is this correct?</p> <p>Edit:</p> <p>Upon further examination, the fastest wheeled vehicle (0-60mph) is able to reach 60mph in 1.08 seconds. source - <a href="http://electricandhybridcars.com/index.php/pages/fastestmotorcycle.html" rel="nofollow">killacycle</a>. It's electric, too!</p> <p>This would require a coefficient of friction of 2.65:</p> <p>ma = μmg</p> <p>a = μg where a = 27m/s ÷ 1.04s = 25.96m/s² and g = 9.81 m/s²</p> <p>so μ = 2.65</p> <p>Are there materials with coefficients of friction this high that are suitable for tires or am I missing something else?</p>