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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.	
  
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.	
  
•  	
  	
  
Fric&on	
  
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.	
  
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.	
  
Air	
  Resistance	
  
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.	
  
Streamlining	
  
Fric&on	
  Experiment	
  

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Friction

  • 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.   •     
  • 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.  
  • 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.