INTERNAL & EXTERNAL FORCE | Physics Animation
What is Internal and External Force?
There are a variety of ways to categorize all the types of forces. Forces can be categorized into internal force or external force.
An internal force is inside the system. This includes the gravity force, magnetic force, electrical force, and spring force. An external force on the other hand is force outside the system. This includes the applied force, normal force, tension force, friction force, and air resistance force.
Why is categorizing internal and external forces relevant?
The importance of categorizing a force as being either internal or external is related to the ability of that type of force to change an object's total mechanical energy when it does work upon an object.
The total mechanical energy of an object is just kinetic energy plus potential energy. So when the total mechanical energy is constant, the forces acting upon the object is an internal force but when the total mechanical energy is changed, the forces acting upon that object is an external force.
An internal force does not have the capability to change the total mechanical energy of an object. This means that the total mechanical energy of that object is constant. Also, you must take note that when internal forces are acting upon an object, the energy can change from potential to kinetic or kinetic to potential. But although the energy has changed, the total mechanical energy of that object will still remain constant and that is because internal forces are conservative forces.
Watch the video to find out more.
Enjoy and learn from this video about Internal and External Forces.
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