* Gravity: This is the primary force acting on the leaf, pulling it downwards towards the Earth.

* Air Resistance (Drag): As the leaf falls, it encounters air resistance. This force opposes the motion of the leaf and increases as the leaf's speed increases.

* Wind: Wind can push the leaf in any direction, depending on its strength and direction.

Other factors to consider:

* Leaf shape and size: A larger, flatter leaf will experience more air resistance than a smaller, more compact leaf.

* Leaf weight: A heavier leaf will be pulled down by gravity more strongly than a lighter leaf.

* Leaf surface: A smooth leaf will experience less air resistance than a rough leaf.

The combination of these forces determines the path and speed of the falling leaf. In general, the leaf will accelerate downwards due to gravity, but the air resistance will slow it down, eventually reaching a terminal velocity where the forces of gravity and air resistance balance.