This is described by Newton's Second Law of Motion:

F = ma

Where:

* F is the net force acting on an object

* m is the mass of the object

* a is the acceleration of the object

In other words:

* More force means more acceleration: If you push harder on an object (greater force), it will accelerate faster.

* More mass means less acceleration: If an object is heavier (greater mass), it will accelerate slower for the same amount of force applied.

Example:

Imagine pushing a shopping cart. If you push harder, the cart accelerates faster. But if you load the cart with heavy groceries, it will accelerate slower even if you push with the same force.