Umma, I seriously doubt that there is a person on this site, who knows about bicycle and motorcycle more than Wikipedia knows (especially for a university essay). Maybe these links will be helpful: http://en.wikipedia.org/wiki/History_of_electric_motorcycles_and_scooters http://en.wikipedia.org/wiki/Motorized_bicycle http://en.wikipedia.org/wiki/Timeline_of_motorized_bicycle_history http://en.wikipedia.org/wiki/Michaux-Perreaux_steam_velocipede http://en.wikipedia.org/wiki/Bicycle http://en.wikipedia.org/wiki/Motorcycle In a nutshell: A motorcycle has a motor and no pedals. I would also pay attention on history of motorized bicycle (cyclemotor), as hybrid of bicycle and motorcycle.

motorcycle is a 2-wheeled motor vehicle bicycle has two wheels and it moved by foot pedals

@AndhyCarzorla!9: thanks for the comment...but i prefer if you answer the question in english, please. Coz i'm not good in Japanese. hehehe... :D

違いは、マシンを使用してモーターを使用していないバイクです。方程式はWin-ラウンドホイールです

Motorcycles run on gas. Bicycles can do without it.