jumpy 0 #1 September 1, 2003 Well I'm doing my physics prac and I dont' get it. We had to pull a cart along a bench first with one rubber band and then all the way up to four. Now if you work out the acceleration of each of these and graph them on a Force vs Acceleration graph, if the line of best fit passes through the force axis first what does this prove?..... Sorry for boring everyone.... lol Quote Share this post Link to post Share on other sites
michaelflying 0 #2 September 1, 2003 ummmmmmm englishwww.skydivekzn.co.za Quote Share this post Link to post Share on other sites
Tonto 1 #3 September 1, 2003 Well, firstly, what tests have you done to ensure the consistency of the rubber bands? Then consider parametric representation of linear manifolds in relation to radius of gyration. tIt's the year of the Pig. Quote Share this post Link to post Share on other sites
miked10270 0 #4 September 1, 2003 Quoteif the line of best fit passes through the force axis first what does this prove?..... Err... That you've cocked up your graph..? Mike. Taking the piss out of the FrenchAmericans since before it was fashionable. Prenait la pisse hors du FrançaisCanadiens méridionaux puisqu'avant lui à la mode. Quote Share this post Link to post Share on other sites
jumpy 0 #5 September 1, 2003 QuoteWell, firstly, what tests have you done to ensure the consistency of the rubber bands? Then consider parametric representation of linear manifolds in relation to radius of gyration. t ahh wah? Purhaps I should have stated this is a high school physics prac.. lol.. Quote Share this post Link to post Share on other sites
julesUK 0 #6 September 1, 2003 Quote Now if you work out the acceleration of each of these and graph them on a Force vs Acceleration graph, if the line of best fit passes through the force axis first what does this prove?..... ...that zero acceleration requires an applied force - you are having to provide a force to overcome the frictional forces. The intercept should be the value of this frictional force. Jules Quote Share this post Link to post Share on other sites
masher 1 #7 September 1, 2003 Yes. You don't have an ideal cart. You have frictional forces to overcome. If you tried it on an airtrack, then it should be a lot less. It may even be zero (within experimental error)-- Arching is overrated - Marlies Quote Share this post Link to post Share on other sites
pds 0 #8 September 1, 2003 Quote Then consider parametric representation of linear manifolds in relation to radius of gyration. a comedian, whodathunkit?namaste, motherfucker. Quote Share this post Link to post Share on other sites
Tonto 1 #9 September 1, 2003 Ahh... Now you went and spoiled it! tIt's the year of the Pig. Quote Share this post Link to post Share on other sites
Tonto 1 #10 September 1, 2003 How are you measuring the acceleration? Are you using a ticker tape? tIt's the year of the Pig. Quote Share this post Link to post Share on other sites
wmw999 2,150 #11 September 1, 2003 If you use the same rubber band all 4 times, and just keep adding more to it, one of the things you prove eventually is that rubber bands lose their stretch. That was one of the conclusions of an 8th-grade science project involving rubber bands, a centrifuge, and an empty room (smart teacher). Wendy W.There is nothing more dangerous than breaking a basic safety rule and getting away with it. It removes fear of the consequences and builds false confidence. (tbrown) Quote Share this post Link to post Share on other sites
billvon 2,435 #12 September 1, 2003 > if the line of best fit passes through the force axis first what does this prove?..... That it is a non-ideal cart, and friction must first be overcome (by applying a given force) before the cart begins to move. Quote Share this post Link to post Share on other sites
kallend 1,651 #13 September 1, 2003 Quote> if the line of best fit passes through the force axis first what does this prove?..... That it is a non-ideal cart, and friction must first be overcome (by applying a given force) before the cart begins to move. I find this a troubling answer because it reinforces a stereotype that many people have that physics does not apply to "the real world", but only to ideal situations (I hear this all the time). Physics applies to the friction too! Physics IS the way we describe the real world. It's just a little more complicated than what is taught in freshman physics courses.... The only sure way to survive a canopy collision is not to have one. Quote Share this post Link to post Share on other sites
Kris 0 #14 September 1, 2003 QuoteThen consider parametric representation of linear manifolds in relation to radius of gyration. Tonto....sheesh! Have the boy start with something a bit simpler to digest. ClickySky, Muff Bro, Rodriguez Bro, and Bastion of Purity and Innocence!™ Quote Share this post Link to post Share on other sites
TitaniumLegs 8 #15 September 1, 2003 Do you hook them up in series, or parallel? How about 2x2? Could you attach them such that you have one (or more) that is anchored closer to the cart and releases as the cart passes? This could overcome the initial static friction, but not be part of the acceleration over a longer time. Just trying to think outside of the cart. Or am I putting the cart before the rubber band? (>o|-< If you don't believe me, ask me. Quote Share this post Link to post Share on other sites
