B Understanding the Physics of a Loop de Loop on a Level Track

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In a level track with a loop de loop, both gravity and the normal force contribute to the centripetal force required for circular motion. At the bottom of the loop, the normal force must exceed gravitational force to create the necessary centripetal acceleration. This imbalance occurs because the cart is transitioning from linear motion to circular motion, requiring additional force to maintain the circular path. The track remains level, but the dynamics change as the cart enters the loop. Understanding this force interaction is crucial for analyzing motion in circular paths.
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Imagine you have a level track with a loop de loop on it. The loop de loop is shaped like a perfect circle. You are inside the cart and approaching the loop de loop.

I know that gravity and the normal force both act to produce the centripetal force. However at the very bottom of the track the normal force and gravity are in opposite direction if the track is level. Since you start going in a circle at the bottom of the loop there has to be an imbalance of forces. So the normal force at the bottom of the loop must be greater than the force of gravity. My question is how is that possible at the instant you are at the bottom of the loop if the track is level.
 
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Don't you only start going in circles when the track stops being level?
 
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