Question

Specify two differences between internal and external forces.

Answer 1

Forces can be categorized as internal forces or external forces. There are many sophisticated and worthy ways of explaining and distinguishing between internal and external forces. Many of these ways are commonly discussed at great length in physics textbooks - particularly college-level physics textbooks. For our purposes, we will simply say that external forces include the applied force, normal force, tension force, friction force, and air resistance force. And for our purposes, the internal forces include the gravity forces, magnetic force, electrical force, and spring force. While this is a simplistic approach, it is an approach that will serve us well in our introduction to physics

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Answer 2

Hey mate....   Ur answer is ....   Internal Forces are forces between objects found inside the system.  1) cannot do work on system 2) cannot change total energy of the system External forces are forces that act on the system and their agents are part of the environment.  1) can do work on system 2) can transfer energy into or out of system, thus changing the total energy of the system   Hope u like it...!!!!