According to Physics, force is any interaction that, when unopposed, will change the motion of an object. Force is a vector quantity and therefore has both magnitude and direction. According to Newton’s Second Law of Motion, the net force acting upon an object is equal to the rate at which its momentum changes with time. This law implies that the acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to the mass of the object. It can cause an object with mass to change its velocity.

Concepts such as pressure, internal mechanical stress are all forces that act on or within the body but plays no part in the acceleration of the body and therefore cannot be considered in the same bracket. The concept of Force had a lot of misconceptions and in the end it was Sir Isaac Newton who formulated the laws of motion that we know now and they were not improved for nearly three hundred years. By the early 20th century, Einstein developed a theory of relativity that correctly predicted the action of forces on objects on both micro and macro scale.

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