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Conceptual PhysicsReading and Study Workbook N Chapter 7 49 Exercises 7.1 Forces and Interactions (page 107) 1. A force is always part of a(n) that involves another force. 2. Define interaction. 3. Describe the interaction forces between a nail and a hammer that hits it. 7.2 Newton’s Third Law (page 108) 4. State Newton’s third law. 5.