The figure shows a thin rod, of length L = 2.70 m and negligible mass, that can pivot about one end to rotate in a vertical circle. A hea ball of mass m = 120 kg is attached to the other end. The rod is pulled aside to angle 80 = 14° and released with initial velocity= (a) What is the speed of the ball at the lowest point? (b) Does the speed increase, decrease, or remain the same if the mass is increas (a) Number (b) i Units 00 L 210

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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.