lecture03 - Dynamics 1. Newton's Three Laws Newton's First...

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Dynamics 1. Newton’s Three Laws Newton’s First Law Existence of inertial systems of reference In inertial system of reference , any object acted by no net force remains at rest or continues its motion along straight line with constant velocity Newton’s Second Law BA AB F F - = Newton’s Third Law a m F = [ ] 2 / 1 1 s m kg N F = = Note: these two forces act on different objects. Never add these forces! Units: (1 lb = 4.448 N)
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Example (Snapped string): A small ball attached to the end of a string moves in circles as shown below. If the string snaps, what will be the trajectory of the ball? C A B Applying Newton’s First Law:    
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F a 1 m 1 F a 2 = 2 a 1 m 2 If both masses are put together and the same force is applied to the combination, what is the resulting acceleration? a ? m 2 F m 1 A. 2/3 a 1 B. 3/2 a 1 C. 3/4 a 1 Example: A force F acting on a mass m 1 results in an acceleration a 1 . The same force acting on a mass m 2 results in an acceleration a 2 = 2 a 1 . = = = = = = = + + + 1 2 1 2 1 1 1 1 2 1 1 2 2 1 3 1 2 2 F F F m m a a a a F F a a F F m m a a
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Example: Car brakes provide a force F for
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lecture03 - Dynamics 1. Newton's Three Laws Newton's First...

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