Q:

What is the equation for the net external force?

A:

The equation for net external force is the sum of all the external forces applied to the object. For example, a compilation of common external forces is friction force, normal force, air resistance, tension and applied force. Because these are vectors, adding them together produces the correct total external force.

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Full Answer

Although there are also internal forces acting on a body, these do not contribute to the total mechanical energy of a body when work is done on it, which is the quantity of greatest interest in calculations of external force. Work is the application of external force on a body to move it a certain distance.

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