Question

what do you understand by external and internal forces??​

Answer 1

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.

Explanation:

Answer 2

❁ΔŇŞŴ€Ř❁

◆ Internal forces of the earth:

⇛Act from within the earth towards the surface, for example, volcanic eruptions and earthquakes.

◆ External forces of the earth:

⇛ Act on the surface of the earth, for example, running water, moving ice, wind, water and waves. They are collectively called as agents of gradation.