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Analyzing the physics of dance can add fundamentally to a dancers skill. Although dancers seldom see themselves totally in physical termsas body mass moving through space under the influence of well-known forces and obeying physical lawsneither can they afford to ignore the physics of movement. For example, no matter how much a dancer wishes to leap off the floor and then start turning, the law of conservation of angular momentum absolutely prevents such a movement. Some movements involving primarily vertical or horizontal motions of the body as a whole, in which rotations can be ignored, can be studied using simple equations of linear motion in three dimensions. However, rotational motions require more complex approaches that involve analyses of the way the bodys mass is distributed, the axes of rotation involved in different types of movement, and the sources of the forces that produce the rotational movement. 17. The primary purpose of the passage is to initiate a debate over two approaches to analyzing a field of study describe how one field of knowledge can be applied to another field point out the contradictions between two distinct theories define and elaborate on an accepted scientific principle discuss the application of a new theory within a new setting 18. The author mentions all of the following as contributing to an understanding of the physics of dance EXCEPT: | 
