1. Gravity: This is the primary force acting on the object, pulling it downwards. The strength of gravity depends on the mass of the object it's attracting (in this case, Earth) and the distance between the object and the Earth.

2. Air Resistance: Also known as drag, this force opposes the object's motion through the air. It depends on the object's shape, size, and velocity.

3. Initial Velocity: How the object begins its fall affects its trajectory. If it starts from rest, it's purely influenced by gravity. If it has an initial horizontal or vertical velocity, its path becomes more complex.

4. Mass: The mass of the object influences its acceleration due to gravity. A more massive object will experience a greater gravitational force. However, in a vacuum, all objects fall at the same rate regardless of their mass (this is a fundamental principle of physics).

5. Altitude: Gravity decreases slightly as you move further away from the Earth's surface. This effect is minimal for everyday free falls, but becomes significant for objects falling from great heights.

6. Shape and Orientation: An object's shape and orientation can affect air resistance. A flat object will experience more drag than a streamlined one.

Important Note: The term "free fall" is often used in a simplified context where air resistance is ignored. In reality, air resistance plays a significant role, especially for objects falling at higher speeds.

Let me know if you want to delve into any of these factors in more detail!