话题：
Writing: imagine a cenario or expre your opinion
Momentum
Momentum refer to the product of peed and ma, or how likely omething i to continue it current tate. What i the momentum referring to? What i the magnitude of the momentum?
Thi week' topic: They maintained the momentum... (90-110 word)
Suggetion:
1) get the momentum going
2) calculating the momentum in a cloed ytem
3) the law of conervation of momentum
4) the film wa building in momentum
5) Intead of writing a cenario, feel free to comment on the tory below.
范例1：
Shawn wa well aware of the difficulty of getting omething omething tarted. If one wa not careful, procratination tended to creep in eaily. The initial momentum wa the mot difficult to get tarted. But once one could get over that hurdle, little piece tended to fall into place much eaier. Keeping the wing of the momentum wa not a challenging a taking the firt tep. Jut little tep in the beginning. That wa Shawn' goal for thi early morning. He intended to analyze the project given the time allowed and other reource available.