Finding the force given the mass and radius.

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ilc
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The attachment shows my approach to this problem, however, the answer is incorrect.

can anyone explain to me how i should be thinking of this problem?
 

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ilc said:
The attachment shows my approach to this problem, however, the answer is incorrect.

can anyone explain to me how i should be thinking of this problem?
attachment.php?attachmentid=51318&d=1348976198.jpg

Hello ilc. Welcome to PF!

Draw a free body diagram for the roller-coaster car.

There are two forces acting in the car.

You only accounted for one of them.