•Mass (amt of matter in an
 object--location independent) in kilograms(kg) (SI units)  but grams (g) more convenient 
  
 
 •Weight: force that gravity
 exerts on an object--location dependent 
  
 
 •weight = mass x acceleration due
 to gravity,
  
 
 •When gravity is
 constant, mass and weight are directly proportional.  (Gravity depends on distance from center of the earth)