Use VectorForce to move a car?

So I want to make my car move using VectorForce but I don’t really know how I can do this.

My current code:

local speed = 100

local function setDriveForce()
	local mass = getMass(vehicle)
	local driveForce = (chassis.CFrame.LookVector * speed) +, -mass * workspace.Gravity, 0)
	DriveForce.Force = driveForce <--- VectorForce


I’m trying to move the car depending on the speed and make it stay on the ground.

Use the VectorForce.Force attribute, and multiply that by the intensity. This may be wrong I have never worked with VectorForce before

show the whole code please, getMass() isn’t an actual function outside of a part