Here is a problem which envisions an unfortunate astronaut stranded exactly half way between the earth and moon. What is the combined force of the earth and moon on it?

The Earth, for example, is massive enough for the force due to gravity to be noticed. Some objects fall differently depending on how gravity and air resistance interact. A feather, for example ...

Legend has it that Isaac Newton had the moment of inspiration that would lead to his theory of gravity when, on a warm ...

Gravity is the force that pulls you toward the ground ... than Earth would need to achieve a higher escape speed. For example, Jupiter is the most massive planet in our solar system.