how do you lock a part's position on only certain axes?

[solar seal]

for example i want to make a part that can only move up, but not left or right or anything else

[dull talon]

set a vector 3

and if the playe trys to move i there

then it does what you want

[solar seal]

pardon

[rain terrace]

** You are now Level 2! **

[dull talon]

if you use vector 3 as a movement system if the player moves the y axis from its origin point it tps it back

[blissful hearth]

when u say lock, i assume u wouldn’t want to move the part in that certain axis; just set the axis u want the player to move in:

part.Position = part.Position + Vector3.new(0,0,-5) 

this is if u want to set only the z axis, i’m on mobile now so it’s a little hard to go more in depth

[rain terrace]

** You are now Level 8! **

[solar seal]

    part:ApplyImpulse(Vector3.new(0, workspace.Player:GetAttribute("FlapPower"), 0))
end

local function Die(collision)
    if(collision.Name == "Kill") then
        workspace.Player:Destroy();
    end
end

game:GetService("ReplicatedStorage"):WaitForChild("Flap").OnServerEvent:Connect(ServerFlap);
workspace.Player.Touched:Connect(Die);

im using applyimpulse

basically when it goes up and falls it rotates sometimes and moves on the x or z axis

i'm trying to only get the y position to change, but keep the x and z position the same

basically when you press space it's applying 350 y impulse

and it sometimes flies off

i'm trying to make it so it won't rotate or move on the x or z axes when it lands