Why rolling motion requires less force than sliding motion to move same mass?

Have you ever wondered why rolling motion moves heavy weight from one place to another with less force? Science behind lies ,we will explore here:-

   See below image

 ,when object is round in shape(sphere) it contact with earth surface is only a single point (theoretically),practically a tiny space. Whole weight of sphere is resting on that single point.Now split sphere into two parts vertically,

 Now compare this split with seesaw.

Weight w1 & w2 are hanging like cantilever beam from split line. Now weight force downwards ( w1 & w2 ) are same in both side, balance is maintained ,thats why sphere is not moving . If we add 1gram of material to one side what will happen?

 This 1 gram creates unbalance of forces hanging on central split line.this causes to sphere starts tilting on 1gram side due to more weight.

This tilt creates rotating motion.

 Now compare  1gram  with push force by us on top side.

It will cause imbalance and sphere starts moving in straight line.once it gets rotating motion.it keeps rotating (theoretically) until opposite force is applied.in real sphere stops rotating beacause of friction on contact point by land.