Mass- The mass of the body is the quantity of matter (or material) contained in it.
- mass is the scalar quantity which has only magnitude but no direction
- The SI unit of mass is kilogram.
- Mass of a body is a measure of inetia of the body.
- The Mass of a body cannot become zero.
Weight-The weight of a body is the force with a certain force which depend on the mass of the body and acceleration due to gravity at that place.
Force = Mass X Acceleration due to gravity
Force= m X g
hence W= m X g
Thus the weight of 1 kg mass is 9.8newton. This means that the force acting on a mass of 1 kg at the surface of the earth is 9.8 newtons.
- Weight is a vector quantity
- The weight of the body changes from places to place
- In space the alue of g = 0 . hence Astonaut feel weightlessness in space.
- The Weight can be Zero.
- A spring balance can show the weight of a body
Weight of an object on the moon
- As the value of g is 1/6 times than that of earth.
- So the weight of an object will be 1/6th of the weight as on the earth.
Consider this Example.
If the weight of a Boy is 504 Newton on the surface of the earth. what will be the weight on the surface of the moon.
As Weight is 1/6 times on the surface of moon.
So The weight will be 504/6 = 84 Newton on the surface of the moon.
Difference between Mass and Weight