The things to be compared, had to be consisted of approach that the tied dumb-bell was quite heavy. To lift it up, the large amount of energy also needed to be expended. But, if we divided or separated the dumb-bell, it would be like putting the catalyze for decreasing the energy causing the activated energy which was the dumb-bell weight. When the energy causing the activated energy lowered down, the easier and faster the chemical reaction would be occurred.