Mass and Weight

Weight and mass are quite distinct concepts.
The mass  
  of a body is a measure of the 'amount of stuff' in a body.
The weight  
  of a body is a measure of the force, specifically the force of gravity acting on a body.
Despite being different concepts, mass and weight are related at each point in space by the equation  
  is the acceleration due to gravity at that point and is equal to about  
\[9.8 m/s^2\]
  on the Earth's surface.
The above equation ignores all forces except the force of gravity. It would not be true for a charged particle in an electric field because the force would be at least partially electric, so would not be due solely to gravity.

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