Difference between mass and weight....

                                 MASS
 The mass of a body is the quantity of matter (or material) contained in it. Mass is a scalar quantity which has only magnitude but no direction. The mass of a body (or object) is commonly measured by an equal arm balance. The S I unit of mass is kilogram which is written in short form as kg. A body contains the same quantity of matter wherever it be -weather on earth, moon or even in outer space. So, the mass of an object is the same everywhere. For example, if the mass of an object is 5 kilograms on the earth, then it will have the same mass of 5 kilograms even when it is taken to any other planet, or moon, or in outer space. Thus, the mass of a body (or object) is constant and does not change from place to place. Mass of a body is usually denoted by the small 'm'. Mass of a body is a measure of inertia of the body and it is also known as inertial mass. The mass of a body cannot be zero. 
                               Weight
The earth attracts every body (or object) towards its centre with a certain force which depends on the mass of the body and acceleration due to gravity at that place. The weight of a body is the force with which it is attracted towards the centre of the earth. In other words, the force of earth's gravity acting on a body is known as its weight.
 We know that,    Force = maas × acceleration 
  But,   W = m × g
Where     m = mass of the body 
                 g = acceleration due to gravity 
                  W = weight 
Weight is a vector quantity having magnitude as well as direction. The weight of a body acts   in vertically downward direction. The weight of a body is usually donated by 'W'. The weight of a body also changes from place to place. Thus, the weight of a body is not constant. In the interplanetary space, where g = 0, the weight of a body becomes zero and we feel true weightlessness. Thus, the weight of a body can be zero.
         Weight of an object on the moon
Just as the weight of an object on the earth is the force with which the earth attracts the object, in the same way, the weight of an object on the moon is the force with which the moon attracts that object. The gravitational force of the moon is about one-sixth that of the earth, therefore, the weight of an object on the moon will be about one-sixth of what it is on the earth. Thus, a spring balance which shows the weight of a body to be 6 N on earth will show a weight of only 1 N when taken to the moon. The weight of an object on the moon is less than that on the earth because the mass and radius of Moon are less than that of earth ( due to which it exerts a lesser force of gravity).

      Difference between Mass and Weight

Mass
1. The mass of an object is the quantity of matter contained in it. 

2. The S I unit of mass is kilogram (kg).

3. The mass of an object is constant.

4. The mass of an object can never be zero.

Weight 
1. The weight of an object is the force with which it is attracted towards the centre of the earth.

2. The SI unit of weight is newton (N).

3. The weight of an object is not constant. It changes with the change in acceleration due to gravity (g).

4. The weight of an object can be zero. For example, in the interplanetary space where 
g = 0, the weight of an object becomes zero.


I am Saheb Sarkar from purnea .

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