# Help a physics student out (very basic physics)

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#### loser_boy_3

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In circular motion. If you have a car going around a banked circle WITH friction how do you calculate the ideal speed with different masses of car, different coefficients of static friction. Etc. If there is no friction you simply use v squared = g*r*tan(theta)<br /><br />Ill give you an example, if you have a car going along a banked curve raised to an angle of 6 degrees, you can calculate the ideal speed with the above equation but how do you calculate the speed if the coefficient of static friction changes, ie say the coefficient of static fric becomes 2.

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#### Saiph

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to figure out how the speed changes: Plug in the new value, or set up another equation between the first coefficient and the second. Something like:<br /><br />U1=4<br />U2=2<br /><br />U2=.5U1<br /><br />Plug that in and it'll tell you how much slower or faster the car gets to go.<br /><br />Though IIRC you should check to see if it matters at all. <div class="Discussion_UserSignature"> <p align="center"><font color="#c0c0c0"><br /></font></p><p align="center"><font color="#999999"><em><font size="1">--------</font></em></font><font color="#999999"><em><font size="1">--------</font></em></font><font color="#999999"><em><font size="1">----</font></em></font><font color="#666699">SaiphMOD@gmail.com </font><font color="#999999"><em><font size="1">-------------------</font></em></font></p><p><font color="#999999"><em><font size="1">"This is my Timey Wimey Detector.  Goes "bing" when there's stuff.  It also fries eggs at 30 paces, wether you want it to or not actually.  I've learned to stay away from hens: It's not pretty when they blow" -- </font></em></font><font size="1" color="#999999">The Tenth Doctor, "Blink"</font></p> </div>

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