Force is a word that everyone has heard about.Force is nothing but a push or pull on an object.Why is that force is of utmost importance to us?Since each and every action of ours is dependent on the action of a system of forces. Force is a vector quantity. Why does a plastic article/wooden article dipped in water comes back to the surface? We push them downwards exerting a downward force and the water exerts an upward force which makes the articles to float upwards.Defining force more meaningfully, force is an interaction between the objects. We know that a force or a system of forces is required to keep a body in equilibrium. Suppose a book is kept on a table, it is in equilibrium but the question is who exerts this force? The answer is that the table exerts force on the book to hold it in equilibrium.
If an object A exerts a force ‘F’ on B implies that object B exerts a force of’ ‘-F’ on A. The forces F and -F are related by Newton’s third law. These two forces F and -F are called as the action and reaction pair. One force is the cause and the other one is the reaction force.
One more important question ” Can you push your car by sitting inside the car?” If you try it for a long time you will find that you have wasted all your energy. The reason is quite simple… The internal forces cannot accelerate a body. Everyone would appreciate this, all the internal forces nullify each other and the net force is zero. Consider a book on the table, at the molecular level, we find a lot of movement but still the book is still in rest. Same as above, the internal forces cannot accelerate a body. Only when you exert a force on the external environment only then you experience a motion with respect to that environment. Even when you walk, you need to exert a force on the ground to move forward. Assume that you are floating in the space. How much ever you try, it is not possible to move by a whisker in the direction you wish to. Even if you try to exert a force, there is no reaction force and the action cannot be completed.Hence there should be some sort of a meduim or an environment on which a force exerted should produce a reaction force , only then movement or tendency of movement is possible. The study of forces is very interesting yet difficult to analyse…
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