(ex) A ball of mass 2.0 kg is connected by two massless strings, each with length L = 0.25 m, to a vertical rotating rod. The strings are tied to the rod with separation d = 0.40 m, and are taut. The period of rotation is 0.50 seconds. (a) Determine the tangential speed of the ball. (b) Determine the tensions in the upper and lower strings. (c) Suppose the rotation is slowed, so that the lower string just barely goes slack. Then what is the new tangential speed of the ball? LACOS

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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.