Thu September 15, 2011 By:

what is planar motion

Expert Reply
Thu September 15, 2011
Planar motion is the result of vectors summing to zero. In the case of force vectors it is the equilibrium condition: 0 = f1 + f2 + f3 + ..fn. Whenever the sum of the vectors is zero, the motion is confined to a plane thus planar motion. When there are three vectors the sum forms a triangle. If there are two vectors the sum forms a line in the null case the sum forms a point at the origin summing to zero 

Conservation of energy is a zero force condition, thus giving planar motion: 
Derivative of Energy= force = 0 at Conservation of Energy, therefore conservation of Energy motion is planar motion. Gravitational orbits are planar motion orbits due to conservation of gravitational energy. 

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