The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.

In simpler terms:

* More force = More acceleration: If you push harder on an object (greater force), it will speed up or slow down faster (greater acceleration).

* More mass = Less acceleration: If an object is heavier (greater mass), it will be harder to get it moving or to stop it (less acceleration).

Mathematically:

This law is expressed as the following equation:

F = ma

Where:

* F is the net force acting on the object (measured in Newtons)

* m is the mass of the object (measured in kilograms)

* a is the acceleration of the object (measured in meters per second squared)

Key Points:

* Net force: This refers to the total force acting on an object, taking into account all forces (e.g., gravity, friction, pushing, pulling).

* Vector quantities: Force and acceleration are vector quantities, meaning they have both magnitude (size) and direction.

* Inertia: This law is closely related to the concept of inertia. Objects with more mass have more inertia, meaning they resist changes in their motion.

Examples:

* Pushing a heavy box requires more force to get it moving than pushing a lighter box.

* A car accelerates faster when the engine provides more power (force).

* A feather falls slower than a rock because it has less mass and experiences less gravitational force.