You can easily check that when rotating, the object loses much less kinetic energy to work than when sliding - take a water bottle, either on its bottom (sliding only) or on its side (a little sliding...You can easily check that when rotating, the object loses much less kinetic energy to work than when sliding - take a water bottle, either on its bottom (sliding only) or on its side (a little sliding plus rolling), push it with the same initial force, and let go: the rolling bottle gets much further. However, somewhat ironically, the bottle can only roll thanks to friction.
