-iv-Mass

Measuring Mass

Mass is the amount of material that a body contains.

Weight is the force of gravity acting on a mass.

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Weight (N) = mass (kg)  x 10

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Compare between mass and weight

 Quantity  Definition   Unit  Device 
Mass the amount of material that a body containsit doesn’t change from one place to another Kg Beam balance 
Weight the force of gravity acting on a massit changes from one place to another according to the strength of gravity of this place N Spring balance   

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Notes:

  • Mass and weight are not the same.
  • Weight will be discussed later.
  • Moon’s gravity is 1/6 of the gravity of earth.
  • If a man with mass 120 kg.
  • His weight on earth will be 1200 N.
  • His weight on moon will be 200 N.
  • His weight in space will be zero N.

Notes about measuring small masses:-

a)   On measuring the mass of very small objects like pins or similar, measure the mass of a certain number of them (40 for example) and then divide the mass of them on this certain number to reduce the measurement error.

b)   As you increase the number the error will be reduced more.

Important note:-

High mass means “High INERTIA”…. what is inertia?

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