Final answer:
An object feels lighter on the moon because the moon's gravitational force is weaker than Earth's, causing a significant reduction in an object's weight, despite its mass remaining the same.
Step-by-step explanation:
An object that feels heavy on Earth would feel lighter on the moon due to the difference in the force of gravity exerted on it. This is because weight, unlike mass, depends on the local gravitational force. The acceleration due to gravity on the Moon is only about 1.625 m/s² compared to Earth's 9.80 m/s². Therefore, an object's weight is significantly less on the Moon, even though its mass remains unchanged.
An astronaut, for example, would weigh only about one-sixth of their Earth weight on the Moon. This reduced weight may result in a feeling of lightness or weightlessness, but it's important to note that their mass does not change despite the difference in gravitational force.