User talk:Eamon Sweeney

Welcome!
Hello, Eamon Sweeney, and welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay. Here are some pages that you might find helpful: Please remember to sign your messages on talk pages by typing four tildes ( ~ ); this will automatically insert your username and the date. If you need help, check out Questions, ask me on my talk page, or ask your question on this page and then place  before the question. Again, welcome! RockMagnetist (talk) 18:58, 6 March 2013 (UTC)
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March 2013
Constructive contributions are appreciated and strongly encouraged, but your recent edit to the userpage of another user may be considered vandalism. Specifically, your edit to User talk:RockMagnetist/list of contributions may be offensive or unwelcome. In general, it is considered polite to avoid substantially editing others' userpages without their permission. Instead, please bring the matter to their talk page and let them edit their user page themselves if they agree on a need to do so. Please refer to User page for more information on User page etiquette. Thank you. RockMagnetist (talk) 18:50, 6 March 2013 (UTC)

Your question
"I have a 165 g screwdriver hanging on a magnetized strip for the last three years - where's the gravity-counteracting energy coming from? It's the first free thing I've ever encountered. "


 * That's a good question. The magnetic force is holding it in place, and no work (in the physics sense) is being done to hold it there, so no input of energy is needed. It seems counterintuitive because we would definitely get tired holding a screwdriver up for three years! That's because of the way our muscles work. Richard Feynman describes it beautifully here. RockMagnetist (talk) 18:58, 6 March 2013 (UTC)