dynamics mechanics force, agent contact force long-range force net force, superposition of forces F r net F r gravitational force, spring force, tension force, atomic model normal force, friction, or drag, thrust, F r thrust D r f r s f r k n r T r F r sp F r G proportionality proportionality constant proportional reasoning inertia inertial mass, m Newton’s second law newton, N Newton’s first law mechanical equilibrium static equilibrium dynamic equilibrium inertial reference frame free-body diagram SUMMARY The goal of Chapter 5 has been to learn how force and motion are connected. General Principles Newton’s First Law An object at rest will remain at rest, or an object that is moving will continue to move in a straight line with constant velocity, if and only if the net force on the object is zero. The first law tells us that no “cause” is needed for motion. Uniform motion is the “natural state” of an object. Newton’s Second Law
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