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Mstari 20:
* [http://www.physicsclassroom.com/class/newtlaws/Lesson-2/The-Meaning-of-Force Physics classroom: Meaning of force]
* [http://eschooltoday.com/science/forces/what-is-a-force.html What is a force? eschool]
* https://www.theoryphysics.co.in/2018/10/force.html
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