We may as well begin with a definition. Kinetics is the study of the effects of forces on the motion of bodies; the whole of this programme is devoted to this topic. Now it is probably clear that such a topic covers a considerable area of work. (Even if you hadn’t realised this, the thickness of this particular programme would be a sufficient indication. And this is only ‘Elementary Kinetics’.) Nevertheless, it will be helpful to appreciate at the beginning that the principles of kinetics are simple, and that all of the work stems from Newton’s Second Law of Motion. There are various ways of stating this Law, but the following will suffice for us.
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