* Newton's Second Law of Motion: This law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.

* Formula: a = F/m (where 'a' is acceleration, 'F' is net force, and 'm' is mass)

* Constant Force: If the force pushing the cart remains the same, increasing the mass means the acceleration must decrease to maintain the balance in the equation. Think of it like this:

* Imagine pushing a lightweight shopping cart and then adding a heavy bag of groceries. It will be harder to accelerate the cart because of the increased mass.

In summary:

* More mass = Less acceleration (with the same force)

Let me know if you'd like more details or examples!