Gravity	
  
Gravity	
  
•  Earth’s	
  gravity	
  pulls	
  objects	
  toward	
  the	
  center	
  
of	
  the	
  Earth	
  and	
  gives	
 ...
Newtons	
  
•  Newtons	
  are	
  named	
  a@er	
  Sir	
  Isaac	
  Newton.	
  
•  On	
  Earth	
  every	
  kilogram	
  of	
 ...
Gravity	
  
•  Other	
  planets	
  also	
  have	
  gravity	
  but	
  the	
  size	
  of	
  
the	
  gravity	
  may	
  be	
  ...
Gravity	
  
•  Gravity	
  is	
  an	
  invisible	
  force.	
  	
  It	
  holds	
  you	
  onto	
  
the	
  Earth.	
  
•  It	
 ...
Gravity	
  
•  It	
  makes	
  everything	
  fall	
  to	
  the	
  ground	
  
•  It	
  holds	
  the	
  Moon	
  in	
  its	
  ...
Gravity	
  
•  Gravity	
  is	
  a	
  pulling	
  force.	
  	
  It	
  never	
  pushes.	
  
•  The	
  pull	
  is	
  always	
 ...
 
Mass	
  
•  Like	
  all	
  objects	
  you	
  have	
  mass.	
  
•  Mass	
  tells	
  you	
  how	
  much	
  material	
  is	
 ...
Weight	
  
•  Mass	
  is	
  o@en	
  confused	
  with	
  weight.	
  
•  Weight	
  tells	
  you	
  how	
  strong	
  the	
  f...
Mass	
  &	
  Weight	
  
•  What	
  happens	
  to	
  your	
  mass	
  and	
  weight	
  on	
  
the	
  moon?	
  
•  The	
  mas...
Mass	
  &	
  Weight	
  
•  If	
  your	
  mass	
  on	
  Earth	
  was	
  50	
  kg,	
  your	
  mass	
  on	
  
the	
  moon	
  ...
Weight	
  
•  Given	
  	
  the	
  force	
  of	
  gravity	
  is	
  one-­‐sixth	
  of	
  that	
  
of	
  the	
  earth,	
  you...
•  Explain	
  what	
  gravity	
  is.	
  
•  Explain	
  in	
  your	
  own	
  words	
  the	
  difference	
  
between	
  mass	...
Gravity mass weight
Gravity mass weight
Gravity mass weight
Gravity mass weight
Gravity mass weight
Gravity mass weight
Gravity mass weight
Gravity mass weight
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Gravity mass weight

  1. 1. Gravity  
  2. 2. Gravity   •  Earth’s  gravity  pulls  objects  toward  the  center   of  the  Earth  and  gives  them  weight.   •  Weight  is  a  force  measured  in  Newtons  (N).  
  3. 3. Newtons   •  Newtons  are  named  a@er  Sir  Isaac  Newton.   •  On  Earth  every  kilogram  of  mass  is  pulled   down  by  gravity  with  a  force  of  10  N.  
  4. 4. Gravity   •  Other  planets  also  have  gravity  but  the  size  of   the  gravity  may  be  different  from  the  Earth.   •  Objects  weigh  more  where  the  gravity  is   bigger.  
  5. 5. Gravity   •  Gravity  is  an  invisible  force.    It  holds  you  onto   the  Earth.   •  It  speeds  you  up  when  you  cycle  downhill   •  It  pulls  you  back  when  you  cycle  uphill  
  6. 6. Gravity   •  It  makes  everything  fall  to  the  ground   •  It  holds  the  Moon  in  its  orbit  around  the   Earth,  and  the  Earth  in  orbit  around  the  Sun.   •  You  cannot  see  it,  but  you  can  observe  its   effects  
  7. 7. Gravity   •  Gravity  is  a  pulling  force.    It  never  pushes.   •  The  pull  is  always  in  a  straight  line  towards  the   center  of  the  Earth.  
  8. 8.  
  9. 9. Mass   •  Like  all  objects  you  have  mass.   •  Mass  tells  you  how  much  material  is  in  your   body.   •  Mass  is  measured  in  grams  (g)  or  in  kilograms   (kg).  
  10. 10. Weight   •  Mass  is  o@en  confused  with  weight.   •  Weight  tells  you  how  strong  the  force  of   gravity  is  pulling  on  your  mass.   •  Weight  is  a  force  and  is  measured  in  Newtons   (N).  
  11. 11. Mass  &  Weight   •  What  happens  to  your  mass  and  weight  on   the  moon?   •  The  mass  of  an  object  NEVER  changes  no   maRer  where  you  take  it.  
  12. 12. Mass  &  Weight   •  If  your  mass  on  Earth  was  50  kg,  your  mass  on   the  moon  would  remain  the  same  at  50kg.   This  is  because  you  are  sTll  made  of  the  same   about  of  material.   •  Your  weight  on  the  moon  would  be  different,   because  the  force  of  gravity  on  the  moon  is   different.  
  13. 13. Weight   •  Given    the  force  of  gravity  is  one-­‐sixth  of  that   of  the  earth,  your  weight  would  be:   •  500  N  divided  by  6  =  83.3  N    
  14. 14. •  Explain  what  gravity  is.   •  Explain  in  your  own  words  the  difference   between  mass  and  weight.   •  Jupiter  has  a  gravity  pull  which  is  2.5   Tmes  greater  than  on  Earth.    Mr  Stace’s   mass  is  80  kg.    What  is  his  mass  and   weight  on  the  surface  of  Jupiter.  

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