What is a force? Be it gravity, electromagnetism or nuclear, it is something that effects an object. If there were no forces, there would be no change. Imagine a world in which force does not exist. Such a world would be changeless. But what is the cause of force itself? What is it that causes change to take place? Life is change. What causes life to change? What is life itself? Some believe that all forces originate from a field. What is it that causes this constant motion and change in all things. Maybe every object has a field surrounding it. When any two objects interact, their fields overlap and this overlap of fields causes force.
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