Final answer:
The pull of gravity from Earth primarily affects objects close to its surface, giving them weight and affecting their motion. Earth's mass heavily influences this gravitational interaction, although gravity is technically a mutual force between two masses, no matter their size.
Step-by-step explanation:
The pull of gravity from Earth has the greatest effect on objects at or near its surface due to its large mass. Gravity is an ever-present force that causes masses to attract each other; the more mass an object has, the greater its gravitational pull. As per Newton's law of universal gravitation, the gravitational force is more significant on objects closer to the Earth, leading to the differentiation in the gravitational pull that can, for instance, cause tidal bulges in Earth's oceans.
While gravity becomes weaker with distance, it is, on Earth's surface, strong enough to provide us with our sense of weight. Your weight on Earth is due to the planet's gravitational force acting upon you, and this weight would vary if you were on a different celestial body with less mass, like the Moon or Mars. Importantly, this gravitational pull is not only responsible for keeping us grounded but also governs the motions of astronomical bodies on a larger scale.
The interplay of gravitational forces between the Earth and another mass, such as a human or a space vehicle, clearly demonstrates that while the Earth accounts for the major share of the effect due to its enormous mass, both bodies are part of the gravitational interaction. As a result, even when someone jumps from a height (not advised), both the individual and the Earth move due to the mutual gravitational attraction, though the movement of Earth is imperceptibly small owing to its massive size.