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# What is a retarding force?

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When a force is applied to an object resting on a surface, a retarding force is that which opposes the force being applied to the object. A retarding force is usually that of friction, which must be overcome when moving an object resting on a surface. If the object is being moved upward along an inclined plane, gravity represents an additional force that must be overcome.

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The retarding force represented by friction can take on various forms. Dry friction refers to the retarding force existing between two solid surfaces in contact with each other. Skin friction, also known as drag, represents the force offering resistance to a fluid moving across the surface area of a body.

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## Related Questions

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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.

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If the net force acting on an object is zero, then it means that the object’s velocity is constant and the object isn’t speeding up or slowing down. That is, there is no acceleration on an object with zero net force.

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The magnitude of the gravitational force acting on an object, F, is proportional to the universal gravitational constant, G, and the product of the two masses involved, m and M. It is inversely proportional to the distance between the objects, r, squared.