 
<translate> Momentum bụ ike nke na-eme ka ihe na-aga n'ihu. Ndị mmadụ na-arụ ọrụ nke ọma mgbe ha nwetara ike iji mee ka ihe na-aga n'ihu. N'ihi ya, azịza ya bụ ike. <eng> Momentum is the force which keeps something going on. People work the best when they gain the force to keep things going.
Therefore, the answer is momentum. 