Final answer:
The force of gravity is lower on a plane in the sky compared to at sea level due to the distance between the object and the center of the Earth.
Step-by-step explanation:
The force of gravity is lower when you are on a plane in the sky compared to being at sea level. This is because the force of gravity depends on the distance between two objects and decreases as the distance increases.
When you are on a plane in the sky, you are farther away from the center of the Earth compared to when you are at sea level. As a result, the force of gravity is weaker on the plane, making you weigh slightly less.
For example, if you weigh 100 pounds at sea level, you might weigh around 99 pounds on a plane in the sky.