Why isn translational Kinematics and Dynamics [Newtons laws] enough?
The kinematics and dynamics of a point mass successfully describes the major movement in sports. Since people and sports equipment are NOT point masses but have extended sizes and shapes, how does this influence motion and to what extent? Of course, we could describe a baseball bat as composed of a multitude of point masses and consider all the forces acting on each part of the point mass. this must include the influence of the neighbouring point masses. We can describe one point mass very simply. In collision theory, we have described two point masses interacting very well. However, describing the interaction of an infinite multitude of point masses is generally very difficult. If the points have a definite and fixed geometric relation, we can use simple physics of the rotation added to the translational kinematics and dynamics. The laws here are not new laws. We are still using Newton’s laws of dynamics but in a form that takes the integrated point masses into account. We have alread
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