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# What is the equation for the net external force?

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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.

## Keep Learning

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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## Related Questions

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To calculate the net force, or unbalanced force, of a Newtonian object, find the sum of all forces presently acting upon it. These include gravity, friction and other forces depending on the scenario. You need only a few figures and computations to calculate an object's net force, which is required for acceleration and is expressed in Newtons.

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Equilibrant forces are those that act on a body at rest and counteract the force pushing or pulling the body in the opposite direction. Equilibrant forces establish equilibrium for an object and make the object motionless. Equilibrant forces act on virtually every object in the world that is not moving.

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Contact forces are those forces that cause a change in another object because the objects are physically touching one another, according to Reference.com. Examples of contact forces include applied force, tension force, air resistance force and normal force.