Physics: Principles with Applications was written by and is associated to the ISBN: 9780130606204. This full solution covers the following key subjects: Bent, difficult, knees, Legs, SIT. This expansive textbook survival guide covers 35 chapters, and 3914 solutions. Since the solution to 15Q from 9 chapter was answered, more than 286 students have viewed the full step-by-step answer. The full step-by-step solution to problem: 15Q from chapter: 9 was answered by , our top Physics solution expert on 03/03/17, 03:53PM. The answer to “Why is it more difficult to do sit-ups when your knees are bent than when your legs are stretched out?” is broken down into a number of easy to follow steps, and 20 words. This textbook survival guide was created for the textbook: Physics: Principles with Applications, edition: 6th.