mass

• Mass


  The amount of matter present in an object
• The mass of an object remains constant no matter where it is placed
• Standard metric unit of mass

  Kilogram
• Inertia


  The tendency of an object to resist change in its state of motion
• Greater the mass of an object

  Greater will be its inertia
• Weight


  A measure of how strongly gravity pulls on the matter in an object
• The pull of gravity is stronger at place B

  The weight of the object will be greater at place B
• SI unit of weight

  Newton
• The weight of an object is directly proportional to its mass
• The mass of an object remains constant everywhere whereas its weight depends on the gravitational force at the location
• newtons second law of motion

  force acting on an object is the products of its mass and acceleration

  F = m x a

  but if its accelaration due to gravity

  F = m x g - this force due to gravity is nothing but the weight of the object

  F = m x g can be re-writed as W = m x g so the weight of an object is the product of its mass and accelaration due to gravity