Difference between revisions of "Forest UCM Energy CentralForce"

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In the polar angle direction
 
In the polar angle direction
:<math>r d \theta \hat theta</math>
+
:<math>r d \theta \hat \theta</math>
  
 
In the aximuthal angle direction
 
In the aximuthal angle direction

Revision as of 12:30, 27 September 2014

A central force is defined as a force depends only on separation distance

[math]\vec{F} = f(\vec r) \hat r[/math]

ie

Coulomb force and gravitation force.

Spherical Coordinates

Forest UCM SphericalCoordUnitVec.png

Forest_UCM_NLM_Ch1_CoordSys#Spherical

The differential change of [math]\vec r[/math] in spherical coordinates occurs in three directions.


In the radial direction

[math]dr \hat r[/math]

In the polar angle direction

[math]r d \theta \hat \theta[/math]

In the aximuthal angle direction

[math]r \sin \phi d \phi[/math]

Gradient in spherical coordinates

Forest_UCM_Energy#Central_Forces