Motor slow start

No, I'm sure you're right, it's a motor !!!

Capacitors normally have no moving parts, so its probably is a motor.
Sausage(Suit)..

Well, after the 'smart-alec' answers...
You say it will start after you "push it with my hand very slowly...". Do you mean you push it slowly, or after it starts it runs slowly?
If it seems to run normally after you give it a push, then yes, you either have a bad cap, or if it uses a centrifugal switch, it's bad.
If it runs slowly, then you have too much binding. Once the motor shaft is turning (by your hand or itself), if it doesn't spin right up to speed then you have a different problem. If it doesn't seem to be bound up (turn power off and try to give it a good spin by hand), then the motor windings must have a fault (shorted turns or something).
daestrom

Thanks for helping... After I spin it with the hand, motor will slowly gain speed, making humming electrical noise (like if you are holding the rotor) and eventualy (20-30 seconds) will gain the normal speed.
Could it be a capacitor?
(daestrom wrote:

Its most likely the capacitor. These small motors often do not have centrifical switches. Should be about a 5 or 6 Mfd capacitor if it is a small household type furnace.
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Actually it's more likely to be the centrifugal start switch. They go out more often than the capacitors do.