* Gravity: Both the tennis ball and the steel ball experience the same gravitational force due to Earth's gravity. This force is proportional to their mass.

* Air Resistance: Air resistance is a force that opposes motion through the air. It depends on factors like the object's shape, size, and speed. The steel ball, being much denser than the tennis ball, will experience less air resistance.

In summary:

* Gravity: The steel ball has a greater mass, so it experiences a stronger gravitational force.

* Air Resistance: The steel ball experiences less air resistance due to its density and shape.

Since the steel ball experiences a stronger gravitational force and less air resistance, the net force acting on it will be greater.