A small puck is positioned on the top of a spherical surface. The puck is then released and gently nudged. At what polar angle will the puck fly offthe sphere? Hint: use an energy solution and the normal reaction at the point of fly-off. Keep in mind the friction of the sphere when modeling the normal reaction.

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Q: work

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Central Force

Central force is the force that acts along the center of mass of one body to the center of mass of another body. Its direction from or away from a point on a body to another is called the center of the force. Such forces include gravitational force between two massive objects or electrostatic forces between two charged particles. So from atoms to planets, the central forces play an important role in shaping our daily lives. One of the remarkable features of central forces is that they are conservative, i.e. the total energy of a central force system can always be expressed as a gradient of a potential energy function.