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lecture09

# lecture09 - Newtons Three Laws Newtons First Law Existence...

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Newton’s Three Laws Newton’s First Law Existence of inertial systems of reference In inertial system of reference , any object 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 m - ? a ~1/m F - ? a ~F a m F ... 3 2 1 F F F F F F n n tot 2 2 / 1 1 / 1 1 s cm g dyne s m kg N Weight: g m W Note: these two forces act on different objects. Never add these forces! Units: (1 lb = 4.448 N)

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If object A exerts a force on object B (an action ”), then object B exerts a force on body A (a “reaction ”). These two forces have the same magnitude but opposite direction. Note: these two forces act on different objects. Newton’s Third Law For every force, or action force , there is an equal but opposite force, or reaction force . BA AB F F A B BA F AB F
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?

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lecture09 - Newtons Three Laws Newtons First Law Existence...

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