# weight and mass

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• mass and weight
• what is mass
• mass is defined as the amount of matter in a body
• it is measued in kilograms(kg)
• its a scaler quantity
• what is weight
• weight is a force and is a meaure of the size of gravitionalal pull on a ob ject exerted
• near the surface of the earth,there is a force of 10N on each 1 kg of mass
• we say that the earths gravitational field strengh, g, is 10 N/kg
• the equation for weight
• weight(N) = mass (kg) x acceleration due to gravity (m/s sqaured)
• measured in newtons.vector quantity so it has size and direction
• why is weight a force
• due t the pull of gravity on the object
• the value of g is rougly the same everywhere on earths surface
• but the further you move away from earth,the smaller g becomes
• in sace far away from plants,he gravitational force is 0 and its said to be weightless
• on earth,the pull of gravity is 10N on a mass of 1 kg
• the value of g is rougly the same everywhere on earths surface
• but the further you move away from earth,the smaller g becomes
• in sace far away from plants,he gravitational force is 0 and its said to be weightless
• gravitation feild strengh (g)= 10N/kg
• divid the g by 1000 o get the mg
• the size of g also gives the gravitational acceleration,because from newtons second law
• acceleration = f divided by m
• g= w divided by m
• the alternative set of units for g is m/s sqaured