Centripetal force for a particle in uniform circular motion.Forces on a body whirling in a vertical circle with center at O.The total displacement from a to b has been divided into small intervals of ∆ x.The straight line is a plot of the function Fx (x)= -kx. The quadrilateral area to the right of a, and the left of b represents the work.A constant force F acts during a displacement ∆r. A force F acts during a small displacement ∆r. The infinitesimal displacement dr is tangent to the path.Path of a particle. The z axis is directed vertically upward.The force acting on an object that is moving away from the earth yields the negative shaded
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