A 2.8 m long arm OB rotates in a plane such that 0 = 0.131². Collar A slides on OB such that its distance from point O is given by r = 2.8 -0.5t² where r is in metres. Determine the magnitudes of velocity and the acceleration of the collar at the instant the arm has turned 28°. 0 B

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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.