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 01-20-08, 10:21 PM #1 BenLi Hardrocker Thread Starter   Join Date: Jul 2007 Bikes: Posts: 1,569 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) Physics Help Please? A cubical block vibrates horizontally, in Simple Harmonic motion (SHM) with an amplitude of 8.0 cm and a frequency of 1.5 Hz. If a smaller block sitting on it is not to slide, what is the minimum value that the coefficient of static friction between the two blocks can be. Answer : 0.72 Can anyone help?
 01-20-08, 10:35 PM #2 EJ123 djentleman     Join Date: Aug 2005 Bikes: Posts: 3,370 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 5 Post(s) Message Phantomcow2. He'll know.
 01-20-08, 10:37 PM #3 stevesurf another cat...FAB!     Join Date: Jun 2005 Location: 1st star to the right... Bikes: Merlin Ti Build, Trek Y-50, Bianchi Titanium Build, Custom Cuevas Road bike Posts: 1,381 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) In Coulomb Damping, the frictional force each of the object's experience are opposite each other and equal. The Coefficient of static friction of the smaller object x the Normal Force (smaller object's weight) = the Frictional Force. Find the equation that relates Force, Amplitude and Frequency of the larger object and solve for the Coeff. of Static Friction. __________________ Change the course of the Epidemic | The Merlin | Merlin XLM | Bianchi Ti | CyclePeople Don't take it off until there's a cure LIVESTRONG | pay it forward | Cats | NEW Gallery 9
 01-20-08, 10:52 PM #4 ElJamoquio Burning Matches.     Join Date: Jan 2006 Location: San Jose, CA Bikes: Motobecane Le Champion SL, Cervelo P2SL Posts: 9,675 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 1022 Post(s) 1. Figure out the acceleration with simple harmonic motion. x = sin(wt) Take the double derivative and find the mzximum. Hint, it should be really easy. 2. Figure out the force. F = m*a = coefficient of friction * m __________________ Reacting is mind candy; it requires no thought. Thinking is tedious. Bikeforums 'Group Buy': Kinlin Rims, Sapim/DT Spokes, Formula/Bitex Hubs "The only good race pace is suicide pace, and today looks like a good day to die." -Steve Prefontaine
 01-20-08, 11:25 PM #5 BenLi Hardrocker Thread Starter   Join Date: Jul 2007 Bikes: Posts: 1,569 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) thanks for the help all. I've solved it. Here's the solution in case you were curious.