fiber friction

1. 
 
 




            




  
             
 





  




   
 


2. 

 





 








 
             













 
 

          
  
    
    
    
    


3.  














 





            



               
 























4. 




          




 

















5.  

              

 



          


              









            



 





 


 





6. 

  









 
 













    



 





7.  
          







  
















8. 

            



 
 




   


  
   


                  







               
 












 












9.  









 



  










  

 

  
  














   
 
     
  
     
 
     


 
 
 

  
 
  
 

