Why does the velocity not move the model?

So I'm trying to animate this aircraft part. It's a model named Gear. Here's my script:

gear = game.Workspace.Gear

function GearUp()
	wait(3)
	gear.Velocity = Vector3.new"0,0,5"
	wait(3)
	gear.Velocity = Vector3.new"0,0,0"
	wait(3)
	gear.Velocity = Vector3.new"0,0,5"
	wait(3)
end 

I was messing with the velocity just so it would rotate someway but it's not. Any help?