interaction action/reaction pair system environment interaction diagram external force propulsion Newton’s third law acceleration constraint massless string approximation SUMMARY The goal of Chapter 7 has been to learn to use Newton’s third law to understand interacting objects. General Principles Newton’s Third Law Every force occurs as one member of an action/reaction pair of forces. The two members of an action/reaction pair: • Act on two different objects. • Are equal in magnitude but opposite in direction: F r A on B 52 F r B on A Solving Interacting-Objects Problems MODEL Choose the objects of interest. VISUALIZE Draw a pictorial representation. Sketch and define coordinates. Identify acceleration constraints. Draw an interaction diagram. Draw a separate free-body diagram for each object. Connect action/reaction pairs with dashed lines. SOLVE Write Newton’s second law for each object. Include
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This note was uploaded on 09/26/2010 for the course PHYS 021 taught by Professor Dick during the Spring '08 term at GWU.