- #1
Paloseco
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First, sorry for my bad english, it is a hard job for me.
I am an engineering student and I have found that something doesn´t match.
Imagine a cylinder, a wheel for example. Case 1) If it if it descends by a plane inclined because of its weight, the friction direction goes in the same way that the angular acceleration, Case 2) But imagine that you give a torque to this wheel to make it raise by the slope. In this case the angular acceleration goes in opposite that in case 1 (and the turn) but the friction force will go in the same direction that before. Is this right? Because some professors claim that the friction force goes always in the same direction that the angular acceleration, but I think that it deppends it the object is pasive (when you let it go downhill) or active (it makes the torque, like in a car wheel). I hope someone confirm me this, is very important for my investigation
Regards
Edited: you can try an applet in this page, it works pretty well:
http://www.edu.aytolacoruna.es/aula/fisica/teoria/A_Franco/solido/roz_rodadura/rozamiento.htm
I am an engineering student and I have found that something doesn´t match.
Imagine a cylinder, a wheel for example. Case 1) If it if it descends by a plane inclined because of its weight, the friction direction goes in the same way that the angular acceleration, Case 2) But imagine that you give a torque to this wheel to make it raise by the slope. In this case the angular acceleration goes in opposite that in case 1 (and the turn) but the friction force will go in the same direction that before. Is this right? Because some professors claim that the friction force goes always in the same direction that the angular acceleration, but I think that it deppends it the object is pasive (when you let it go downhill) or active (it makes the torque, like in a car wheel). I hope someone confirm me this, is very important for my investigation
Regards
Edited: you can try an applet in this page, it works pretty well:
http://www.edu.aytolacoruna.es/aula/fisica/teoria/A_Franco/solido/roz_rodadura/rozamiento.htm
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