A rollercoaster cart of mass 450.0 kg is traveling in a loop of radius of 15.0m. Its speed at point A is 28.0m/s and its speed at point B is 14.0 m/s. Assume that at A the cart is already moving with circular motion. 1.  Draw free body diagrams for the cart at points A and B (two separate free body diagrams). 2.  Calculate the acceleration of the cart at points A and B (magnitude and direction). 3. Calculate the magnitude of the normal force exerted by the tracks on the cart at point A. 4.  Calculate the magnitude of the normal force exerted by the tracks on the cart at point B.

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!