Here's a breakdown:

* Gravity: This is a fundamental force of nature that attracts any two objects with mass. The more massive an object is, the stronger its gravitational pull.

* Earth's Gravity: The Earth has a significant mass, creating a strong gravitational field. This field pulls all objects towards the Earth's center, causing them to experience a downward force.

Other factors can contribute to the downward force on an object:

* Weight: The weight of an object is the force exerted on it due to gravity. It's calculated by multiplying the object's mass by the acceleration due to gravity (9.8 m/s² on Earth).

* Air Resistance: While not directly a downward force, air resistance can oppose the downward motion of an object, reducing the overall downward force it experiences.

Let me know if you have any other questions!