Define weight . State its SI and CGs units .

Explanation

The weight of a body is defined as the force with which the earth attracts it . Its SI unit is the newton and CGS unit is the dyne .
[ Note : In the usual notation , the magnitude of the weight of a body on the earth ' s surface is . `W=(GmM)/(R^(2))=m(GM)/(R^(2))=mg`. Thus , Hence , weight varies just like the acceleration due to gravity . It is maximum at the poles and minimum at the equator . It decreases with altitude ( h ) and depth ( d ) below the earth ' s surface . It becomes zero at the earth ' s centre . At a heigh h above the earth ' s surface , `w = (GmM)/((R+h)^(2))` and at a depth d below the earth' s surface , `W=(GmR(R-d))/(R^(3))` . Weight has magnitude and R direction ( towards the earth's centre ) . It is a vector quantity . ]