Question

what is the difference between what is the difference between internal and external forces ​

Answer 1

The forces acting inside the surface of the Earth are called as internal forces
The forces acting on the surface of the Earth are called external forces

Answer 2

Answer:

External forces are forces caused by external agent outside of the system. Internal forces are forces exchanged by the objects in the system. To determine what part should be considered external and internal, mechanical system should be clearly defined.