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It can be stated that 2 force systems are equivalent when they result in a similar resultant force and movement. When a particular force is moved along its line of action, it results in a newly developed force systems that is equivalent to the actual force system. Hence, it can be stated that multiple forces on a rigid body can be replaced by using a single force, without bringing about any change in the external effects of the body.

This acting of a singular force is known as the concept of Single Equivalent Force and it is a very important concept in Mechanical Engineering.