Umei Posted June 14, 2009 Report Share Posted June 14, 2009 Does friction always act opposite to the direction of motion? Link to comment Share on other sites More sharing options...
Jochi1543 Posted June 14, 2009 Report Share Posted June 14, 2009 This thread is not what I hoped it would be. Link to comment Share on other sites More sharing options...
h9i9j9 Posted June 14, 2009 Report Share Posted June 14, 2009 yes, it resists motion. Look at: http://en.wikipedia.org/wiki/Friction Link to comment Share on other sites More sharing options...
w8kg6 Posted June 14, 2009 Report Share Posted June 14, 2009 One exception might be in a body with angular velocity, for example a moving car that's turning. In this case, I'm pretty sure that friction points to the center of the radius of curvature, but I could be wrong on this. Link to comment Share on other sites More sharing options...
NewfieMike Posted June 14, 2009 Report Share Posted June 14, 2009 One exception might be in a body with angular velocity, for example a moving car that's turning. In this case, I'm pretty sure that friction points to the center of the radius of curvature, but I could be wrong on this. that is correct, w8. Think about it. If it didn't face towards the center, the car would never be able to maintain moving in a circle, like a car trying to do circles on ice edit: now that I think about it, I'd say there is also a frictional force moving in a direction tangential to the circle but facing the opposite direction of the car. This would be the difference in regular smooth tires vs. winter tires on the car, methinks Link to comment Share on other sites More sharing options...
deeman101 Posted June 14, 2009 Report Share Posted June 14, 2009 In linear motion friction acts in the direction opposite to motion. Circular motion can make it perpendicular (case above), but I highly doubt you'll get complicated physics questions like that. The kinematics and dynamics questions on the MCAT are relatively easy stuff. Link to comment Share on other sites More sharing options...
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