how do i throw a part? read Desc

I made a "part a tool" and I want to know how do I make a key press that wil throe the part straight ahead of me? does it deal with Velocity?

Well, first off. You're going to need to use CFrames to put the part in front of you and yes it uses BodyVelocity. You put the BodyVelocity in the part and then if you want it to depend on where the character is looking, lookVector will help. I am not going to provide you with a script, but I will give you some advice.

Here's a link that should help you with CFrames and lookVector:

http://wiki.roblox.com/index.php/CFrame

If you have the script directly inside the tool and the part as the handle then.

local plyr = game.Players.LocalPlayer
local char = game.Workspace:WaitForChild(plyr.Name)
script.Parent.Activated:Connect(function()
	script.Parent.Part.CFrame = CFrame.new(char.Head.Position.X,char.Head.Position.Y + 2,char.Head.Position.Z)
	script.Parent = game.Workspace
	script.Parent.Part.Velocity = Vector3.new(char.Head.CFrame.Lookvector)
end)

try that.