"Can you create a system for inertia based physics that affects the way the player moves to make it similar to the way humans move in real life?"

Creating a full inertia-based physics system is quite complex and beyond the scope of a simple script. However, I can provide you with a basic example of how you can modify the player's movement to simulate inertia.

This script will change the player's WalkSpeed based on their current velocity, making it harder to start and stop moving. You can adjust the values to make the effect more or less pronounced.

```lua
-- server script
local Players = game:GetService("Players")

local function onCharacterAdded(character)
    local humanoid = character:WaitForChild("Humanoid")
    local rootPart = character:WaitForChild("HumanoidRootPart")

local baseWalkSpeed = humanoid.WalkSpeed
    local maxWalkSpeed = baseWalkSpeed * 1.5
    local acceleration = 0.1
    local deceleration = 0.05

while character.Parent do
        local currentSpeed = humanoid.WalkSpeed
        local currentVelocity = rootPart.Velocity

if humanoid.MoveDirection.Magnitude > 0 then
            -- Accelerate
            humanoid.WalkSpeed = math.min(maxWalkSpeed, currentSpeed + acceleration)
        else
            -- Decelerate
            humanoid.WalkSpeed = math.max(baseWalkSpeed, currentSpeed - deceleration)
        end

-- Apply inertia effect
        local inertia = currentVelocity * Vector3.new(1, 0, 1)
        rootPart.CFrame = rootPart.CFrame * CFrame.new(inertia)

wait()
    end
end

local function onPlayerAdded(player)
    player.CharacterAdded:Connect(onCharacterAdded)
end

Players.PlayerAdded:Connect(onPlayerAdded)
```

Keep in mind that this script is just a starting point and may not provide the exact behavior you're looking for. You'll likely need to experiment with different approaches and fine-tune the values to achieve the desired effect.