Why this perpetuum mobile can't be possible? [duplicate]

I know that this won't work but I'm asking Why?

Becuase as far as the vehicle POV - there is a force which drags him to the right.

Isnt $F=ma$ applies here? What is that im missing?

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marked as duplicate by Qmechanic♦Jul 27 '13 at 17:44

There is no reason to downvote. Even if you know the answer, many people out there actually believe it will work, or don't know the reason why it won't. This is NOT a bad question. –  mikhailcazi Jul 27 '13 at 14:41
@mikhailcazi agree. but I dont tend to educate people about helping other people raise their knowledge. –  Royi Namir Jul 27 '13 at 14:42
I just updated my answer again. Did it help you understand? :) –  mikhailcazi Jul 27 '13 at 14:44
@mikhailcazi yes indeed thank you. –  Royi Namir Jul 27 '13 at 14:44
duplicate of Why does the "Troll-Mobile" not work? –  EnergyNumbers Jul 27 '13 at 16:54