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Transcript

  • 1.  
  • 2. Fric&on   •  Fric&on  is  a  force  between  2  surfaces  that  are   sliding,  or  trying  to  slide,  across  each  other.   •  Fric&on  always  slows  down  a  moving  object.   •  Air  resistance  is  a  type  of  fric&on.  
  • 3. Fric&on   •  Fric&on  is  a  force  between  two  surfaces  that  are   sliding,  or  trying  to  slide,  across  each  other.  For   example,  when  you  try  to  push  a  book  along  the   floor  fric&on  makes  this  difficult.   •  Fric&on  always  works  in  the  direc&on  opposite   from  the  direc&on  the  object  is  moving,  or  trying   to  move.  Fric&on  always  slows  a  moving  object   down.   •     
  • 4. Fric&on  
  • 5. Fric&on   More  or  less  fric,on   •  The  amount  of  fric&on  depends  on  the  materials   from  which  the  two  surfaces  are  made.  The   rougher  the  surface,  the  more  fric&on  is   produced.   Heat   •  Fric&on  also  produces  heat.  If  you  rub  your  hands   together  quickly,  you  will  feel  them  get  warmer.  
  • 6. Air  Resistance   •  Air  resistance   •  Air  resistance  is  a  type  of  fric&on  between  air   and  another  material.  When  an  aeroplane   flies  through  the  air,  for  example,  air  par&cles   hit  the  aeroplane,  making  it  more  difficult  for   it  to  move  through  the  air.  
  • 7. Air  Resistance  
  • 8. Streamlining   •  Some  shapes,  known  as  streamlined  shapes,   cause  less  air  resistance  than  others.   Aeroplanes  and  cars  are  streamlined,  so  that   they  move  through  the  air  as  easily  as   possible.  
  • 9. Streamlining  
  • 10. Fric&on  Experiment