Physics 111 -Lecture 8 Newton's Laws Examples, Friction

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Physics 111 -Lecture 8 Newton's Laws Examples, Friction Powered By Docstoc
					          Physics 111 - Lecture 8
       Newton’s Laws Examples, Friction

Example 2: Atwood’s machine with a frictionless rope
and a massless frictionless pully; For m1 > m2 find the
acceleration and tension in the rope.




                                  x
     Free Body Diagrams




     Friction
         Kinetic Friction: Always opposite to direction
         of motion
                              Ffriction = µ K FN
  Friction (cont.)
      Static Friction: Friction before sliding

                           Ffriction < µS FN

Example 3: Block of mass m sliding down an inclined
plane with coefficient of friction µK. Calculate
acceleration of the block.