You need to equip throwing knife and press RB on XBOX
The knife takes the place of your frag grenade, so your "throw grenade" button. Default is G I think.
There is no throwing knife in Call of Duty 4: Modern Warfare.
The difference is relatively simple. A Throwing Knife is obviously a knife which you can throw as part of your equipment, and is available on Call of Duty: Modern Warfare 2, whereas Tomahawk is only featured in Treyarch's Call of Duty games, particular famous in Call of Duty: Black Ops, the seventh installment of the Call of Duty series. A Tomahawk however, is more of an axe that orginated from Native American cultur, it still exists as an option of your equipment in Call of Duty: Black Ops.
no
When you knife someone in COD you shank them.
yes
u can't
i donno
I can find no knife in the weapons shown in the related link
there are many types of knifes used such as the bowie knife and the sogknife
You get it by leveling up.Level 13 i think it is :).Throwing Knife: Unlocked at Level 7. Reusable throwing blade. Throw it and pick it back up see related link for List of weapons and attachments in Call of Duty: Modern Warfare 2A related link has also been added for COD Wikia on the Throwing Knife
throw gernade